FS Specialty Lending Fund (FSEN) 10-K15 Mar 242023 FY Annual reportFinancial data

Company Profile

Cover

Cover - USD ($)	12 Months Ended
Cover - USD ($)	Dec. 31, 2023	Mar. 01, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	814-00841
Entity Registrant Name	FS Specialty Lending Fund
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-6822130
Entity Address, Address Line One	201 Rouse Boulevard
Entity Address, City or Town	Philadelphia
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19112
City Area Code	215
Local Phone Number	495-1150
Title of 12(g) Security	Common Shares of Beneficial Interest, par value$0.001 per share
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 0
Entity Common Stock, Shares Outstanding		455,506,155
Documents Incorporated by Reference	The contents of the amendment to this Annual Report on Form 10-K, which will be filed with the U.S. Securities and Exchange Commission within 120 days following the end of the registrant's fiscal year ended December 31, 2023, are incorporated by reference into Part III of this Annual Report on Form 10-K.
Amendment Flag	false
Entity Central Index Key	0001501729
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY

Audit Information

Audit Information	12 Months Ended
Audit Information	Dec. 31, 2023	Dec. 31, 2022
Audit Information [Abstract]
Auditor Name	Ernst & Young LLP	RSM US LLP
Auditor Location	Philadelphia, Pennsylvania	Blue Bell, Pennsylvania
Auditor Firm ID	42	49

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2023		Dec. 31, 2022
Assets
Investments, at fair value		$ 1,523,196	[1],[2]	$ 2,047,115	[3]
Cash and cash equivalents		486,059	[1],[2],[4]	481,655
Restricted cash		6,699		0
Receivable for investments sold and repaid		27,860		7,022
Interest receivable		15,093		21,932
Dividends receivable		360		878
Swap income receivable		36		83
Prepaid expenses and other assets		254		96
Total assets		2,059,557		2,558,781
Liabilities
Payable for investments purchased		61,596		0
Secured note payable, net of deferred financing costs	[5]	0		454,671
Unrealized depreciation on swap contracts		0		698
Swap income payable		259		26
Shareholder distributions payable		27,740		13,543
Management fees payable		8,416		11,185
Administrative services expenses payable		108		1,086
Interest payable		1,603		13,371
Trustees' fees payable		164		164
Other accrued expenses and liabilities		3,179		4,851
Total liabilities		497,502		805,033
Commitments and contingencies	[6]
Shareholders' equity
Preferred shares, $0.001 par value, 50,000,000 shares authorized, none issued and outstanding		0		0
Common shares, $0.001 par value, 700,000,000 shares authorized, 455,506,155 and 451,465,673 shares issued and outstanding, respectively		456		451
Capital in excess of par value		3,185,784		3,191,293
Accumulated earnings (deficit)		(1,624,185)		(1,437,996)
Total shareholders' equity		1,562,055		1,753,748
Total liabilities and shareholders' equity		$ 2,059,557		$ 2,558,781
Net asset value per common share at year end (in USD per share)		$ 3.43		$ 3.88
Amortized Cost		$ 1,543,925	[1]	$ 1,922,940
Deferred financing costs on secured notes payable		$ 0		$ 1,253
Preferred stock, shares authorized		50,000,000		50,000,000
Preferred stock, shares issued		0		0
Preferred stock, shares outstanding		0		0
Preferred stock, par value (in USD per share)		$ 0.001		$ 0.001
Common stock, par value (in USD per share)		$ 0.001		$ 0.001
Common stock, shares authorized		700,000,000		700,000,000
Common stock, shares issued		455,506,155		451,465,673
Shares outstanding, end of year (in shares)		455,506,155		451,465,673
Repurchase Facility
Liabilities
Facilities payable, net of deferred financing costs	[5]	$ 394,437		$ 0
Shareholders' equity
Deferred financing cost on facilities payable		5,563		0
Credit Facilities
Liabilities
Facilities payable, net of deferred financing costs	[5]	0		305,438
Shareholders' equity
Deferred financing cost on facilities payable		0		238
Non-controlled/unaffiliated Investments
Assets
Investments, at fair value		1,414,684		1,786,887
Shareholders' equity
Amortized Cost		1,358,793		1,656,169
Non-controlled/affiliated investments
Assets
Investments, at fair value		7,496		65,777
Shareholders' equity
Amortized Cost		25,601		94,068
Controlled/affiliated investments
Assets
Investments, at fair value		101,016		194,451
Shareholders' equity
Amortized Cost		$ 159,531		$ 172,703

[1]Security may be an obligation of one or more entities affiliated with the named company.[2]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.[3]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.[4]Includes $23,098 held in Allspring Government Money Market Fund with a 7-day yield of 5.3% as of December 31, 2023.[5]See Note 9 for a discussion of the Company's financing arrangements.[6]See Note 10 for a discussion of the Company's commitments and contingencies.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023		Dec. 31, 2022
Amortized Cost	$ 1,543,925	[1]	$ 1,922,940
Deferred financing costs on secured notes payable	$ 0		$ 1,253
Preferred stock, par value (in USD per share)	$ 0.001		$ 0.001
Preferred stock, shares authorized	50,000,000		50,000,000
Preferred stock, shares issued	0		0
Preferred stock, shares outstanding	0		0
Common stock, par value (in USD per share)	$ 0.001		$ 0.001
Common stock, shares authorized	700,000,000		700,000,000
Common stock, shares issued	455,506,155		451,465,673
Common stock, shares outstanding	455,506,155		451,465,673
Repurchase Facility
Deferred financing cost on facilities payable	$ 5,563		$ 0
Credit Facilities
Deferred financing cost on facilities payable	0		238
Non-controlled/unaffiliated Investments
Amortized Cost	1,358,793		1,656,169
Non-Controlled/Affiliated
Amortized Cost	25,601		94,068
Controlled/affiliated
Amortized Cost	$ 159,531		$ 172,703

[1]Security may be an obligation of one or more entities affiliated with the named company.

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investment income
Paid-in-kind interest income		$ 14,199	$ 19,925	$ 27,816
Fee income		591	0	0
Total investment income		157,722	184,967	150,707
Operating expenses
Management fees		35,377	44,559	41,561
Administrative services expenses		6,087	5,626	5,713
Share transfer agent fees		3,206	2,985	2,918
Accounting and administrative fees		588	731	692
Interest expense	[1]	23,698	55,716	54,122
Trustees' fees		667	742	787
Other general and administrative expenses		4,494	5,105	3,094
Total operating expenses		74,117	115,464	108,887
Less: Management fee offset	[2]	(341)	(2,619)	(1,439)
Net expenses		73,776	112,845	107,448
Net investment income before taxes		83,946	72,122	43,259
Federal and state taxes		2,583	2,353	0
Net investment income		81,363	69,769	43,259
Realized and unrealized gain/loss
Net realized gain (loss) on investments:		(59,301)	37,383	(273,439)
Net realized gain (loss) on foreign currency		(123)	(202)	(28)
Net realized gain (loss) on swap contracts		1,048	(2,785)	0
Net realized gain (loss) on debt extinguishment		0	(929)	0
Net change in unrealized appreciation (depreciation) on investments:		(144,904)	82,009	436,095
Net change in unrealized appreciation (depreciation) on swap contracts		698	(698)	0
Net change in unrealized appreciation (depreciation) on foreign currency		36	(45)	(12)
Total net realized and unrealized gain (loss)		(202,546)	114,733	162,616
Net increase (decrease) in net assets resulting from operations		$ (121,183)	$ 184,502	$ 205,875
Per share information—basic and diluted
Net increase (decrease) in net assets resulting from operations (Earnings per Share), basic (in USD per share)		$ (0.27)	$ 0.41	$ 0.46
Net increase (decrease) in net assets resulting from operations (Earnings per Share), diluted (in USD per share)		$ (0.27)	$ 0.41	$ 0.46
Weighted average shares outstanding, basic (in shares)		454,418,684	449,393,210	443,768,738
Weighted average shares outstanding, diluted (in shares)		454,418,684	449,393,210	443,768,738
Non-controlled/unaffiliated Investments
Investment income
Interest income		$ 118,530	$ 119,003	$ 102,342
Paid-in-kind interest income		4,685	12,666	20,827
Fee income		3,662	4,660	2,508
Dividend income		14,801	21,804	870
Realized and unrealized gain/loss
Net realized gain (loss) on investments:		(29,350)	(21,652)	9,454
Net change in unrealized appreciation (depreciation) on investments:		(74,827)	54,379	304,707
Non-Controlled/Affiliated
Investment income
Interest income		675	3,219	6,889
Paid-in-kind interest income		97	105	215
Fee income		0	7,268	0
Dividend income		0	5,417	1,574
Realized and unrealized gain/loss
Net realized gain (loss) on investments:		(29,951)	43,136	(282,893)
Net change in unrealized appreciation (depreciation) on investments:		10,186	(4,010)	142,870
Controlled/affiliated
Investment income
Interest income		3,720	2,936	2,970
Paid-in-kind interest income		3,228	7,154	6,774
Fee income		0	0	9
Dividend income		8,324	735	5,729
Realized and unrealized gain/loss
Net realized gain (loss) on investments:		0	15,899	0
Net change in unrealized appreciation (depreciation) on investments:		$ (80,263)	$ 31,640	$ (11,482)

[1] See Note 9 for a discussion of the Company’s financing arrangements. See Note 4 for a discussion of the offset by FS/EIG Advisor, LLC, the Company's investment adviser, of certain management fees to which it was otherwise entitled during the applicable period.

Consolidated Statements of Chan

Consolidated Statements of Changes in Net Assets - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operations
Net investment income		$ 81,363	$ 69,769	$ 43,259
Net realized gain (loss) on investments, foreign currency, swap contracts and debt extinguishment		(58,376)	33,467	(273,467)
Net change in unrealized appreciation (depreciation) on investments		(144,904)	82,009	436,095
Net change in unrealized appreciation (depreciation) on swap contracts		698	(698)	0
Net change in unrealized appreciation (depreciation) on foreign currency		36	(45)	(12)
Net increase (decrease) in net assets resulting from operations		(121,183)	184,502	205,875
Shareholder distributions
Distributions to shareholders	[1]	(86,059)	(53,938)	(53,264)
Net decrease in net assets resulting from shareholder distributions	[1]	(86,059)	(53,938)	(53,264)
Capital share transactions
Reinvestment of shareholder distributions	[2]	15,549	20,861	21,135
Net increase (decrease) in net assets resulting from capital share transactions	[2]	15,549	20,861	21,135
Total increase (decrease) in net assets		(191,693)	151,425	173,746
Net assets at beginning of year		1,753,748	1,602,323	1,428,577
Net assets at end of year		$ 1,562,055	$ 1,753,748	$ 1,602,323

[1]See Note 5 for a discussion of the sources of distributions paid by the Company.[2]See Note 3 for a discussion of the Company’s capital share transactions.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net increase (decrease) in net assets resulting from operations		$ (121,183)		$ 184,502	$ 205,875
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:
Purchases of long-term investments		(774,503)		(375,192)	(883,097)
Paid-in-kind interest		(14,199)		(19,925)	(27,816)
Proceeds from sales and repayments of long-term investments		1,135,433		869,402	870,992
Net proceeds from sales (purchases) of short-term investments		(20,994)		0	0
Net realized (gain) loss on investments		59,301		(37,383)	273,439
Net change in unrealized (appreciation) depreciation on investments		144,904		(82,009)	(436,095)
Net change in unrealized (appreciation) depreciation on swap contracts		(698)		698	0
Accretion of discount		(6,023)		(6,785)	(11,170)
Amortization of deferred financing costs and discount		3,414		6,095	7,824
(Increase) decrease in receivable for investments sold and repaid		(20,838)		(2,047)	2,716
(Increase) decrease in interest receivable		6,839		4,310	463
(Increase) decrease in dividends receivable		518		(878)	0
(Increase) decrease in swap income receivable		47		(83)	0
(Increase) decrease in prepaid expenses and other assets		(158)		60	78
Increase (decrease) in payable for investments purchased		61,596		(49,500)	49,500
Increase (decrease) in swap income payable		233		26	0
Increase (decrease) in management fees payable		(2,769)		719	310
Increase (decrease) in administrative services expenses payable		(978)		(238)	375
Increase (decrease) in interest payable	[1]	(11,768)		(799)	(66)
Increase (decrease) in trustees' fees payable		0		(36)	8
Increase (decrease) in other accrued expenses and liabilities		(1,672)		2,815	64
Net cash provided by (used in) operating activities		436,502		493,752	53,400
Cash flows from financing activities
Shareholder distributions paid		(56,313)		(32,922)	(31,929)
Repayments of credit facilities	[1]	(305,676)		(10,000)	(225,000)
Repayments under senior secured notes	[1]	(457,075)		(31,925)	0
Deferred financing costs paid		(6,335)		(138)	(128)
Net cash provided by financing activities		(425,399)		(45,976)	(162,057)
Total increase (decrease) in cash, cash equivalents and restricted cash		11,103		447,776	(108,657)
Cash at beginning of year		481,655		33,879	142,536
Cash, cash equivalents and restricted cash at end of year		492,758	[2]	481,655	33,879
Supplemental disclosure
Non-cash reinvestment of shareholder distributions		15,549		20,861	21,135
Non-cash purchases of investments		(3,284)		(1,587)	(127,399)
Non-cash sales of investments		3,284		1,587	127,399
Federal and state taxes paid		4,081		404	0
Repurchase Facility
Cash flows from financing activities
Borrowings under debt facilities	[1]	400,000		0	0
Credit Facilities
Cash flows from financing activities
Borrowings under debt facilities	[1]	$ 0		$ 29,009	$ 95,000

[1] See Note 9 for a discussion of the Company's financing arrangements. During the years ended December 31, 2023, 2022 and 2021, the Company paid $32,052, $50,420 and $46,364, respectively, in interest expense on the financing arrangements and Senior Secured Notes. Includes cash and cash equivalents of $486,059 and restricted cash of $6,699. Restricted cash is the cash collateral required to be posted pursuant to the Company’s derivative contracts.

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Statement of Cash Flows [Abstract]
Interest expense paid	$ 32,052		$ 50,420	$ 46,364
Cash and cash equivalents	486,059	[1],[2],[3]	481,655
Restricted cash	$ 6,699		$ 0

[1]Includes $23,098 held in Allspring Government Money Market Fund with a 7-day yield of 5.3% as of December 31, 2023.[2]Security may be an obligation of one or more entities affiliated with the named company.[3]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

Consolidated Schedule of Invest

Consolidated Schedule of Investments $ in Thousands		12 Months Ended
Consolidated Schedule of Investments $ in Thousands		Dec. 31, 2022 USD ($) MMBTU $ / shares $ / MMBTU $ / bbl shares bbl		Dec. 31, 2023 USD ($) $ / shares shares		Dec. 31, 2021 USD ($)
Percent of net assets (percent)		116.70%		97.50%	[1]
Rate (percent)	[2],[3],[4],[5]	10%
Amortized Cost		$ 1,922,940		$ 1,543,925	[1]
Fair Value		$ 2,047,115	[6]	$ 1,523,196	[1],[7]
Liabilities in excess of other assets percentage (percent)		(16.70%)		(28.60%)	[1]
Cash and cash equivalents		$ 481,655		$ 486,059	[1],[7],[8]
Assets (liabilities) in excess of other liabilities (assets)		(293,367)	[6]	(447,200)	[1],[7],[9]
Net Assets		1,753,748	[6]	$ 1,562,055	[1],[7]
Equity Total Return Swaps
Number of shares \| shares	[10]			6,756,299
Interest rate (percent)	[10],[11]			1.15%
Notional	[10]			$ 38,308
Unrealized appreciation	[10],[12]			$ 0
Total Commodity Fixed Price Swaps
Unrealized appreciation	[13],[14]	0
Unrealized depreciation	[13],[14]	698
Total Commodity Fixed Price Swaps—Crude Oil
Unrealized appreciation	[13],[14]	$ 0
Notional amount, volume (in Bbls) \| bbl	[14]	168,511
Weighted average price (in dollars per Bbls, in dollars per MMBtu) \| $ / bbl	[14]	80
Unrealized depreciation	[13],[14]	$ 572
Total Commodity Fixed Price Swaps—Natural Gas
Unrealized appreciation	[13],[14]	$ 0
Notional amount, energy (in MMBtu) \| MMBTU	[14]	314,818
Weighted average price (in dollars per Bbls, in dollars per MMBtu) \| $ / MMBTU	[14]	3.80
Unrealized depreciation	[13],[14]	$ 126
Senior Secured Loans—First Lien
Percent of net assets (percent)		40.30%	[5]	52.90%	[1]
Amortized Cost		$ 702,842	[5]	$ 878,013	[1]
Fair Value		706,646	[5],[6]	825,158	[1],[7]
Total Senior Secured Loans—First Lien
Amortized Cost		727,228	[5]	889,245	[1]
Fair Value		731,032	[5],[6]	836,390	[1],[7]
Unfunded Loan Commitments
Amortized Cost		(24,386)	[5]	(11,232)	[1]
Fair Value		$ (24,386)	[5],[6]	$ (11,232)	[1],[7]
Senior Secured Loans—Second Lien
Percent of net assets (percent)		8.20%	[5]	3.50%	[1]
Amortized Cost		$ 143,153	[5]	$ 55,064
Fair Value		143,270	[5],[6]	54,424
Total Senior Secured Loans—Second Lien
Amortized Cost		144,658	[5]	55,064	[1]
Fair Value		144,775	[5],[6]	$ 54,424	[1],[7]
Unfunded Loan Commitments
Amortized Cost	[5]	(1,505)
Fair Value	[5],[6]	$ (1,505)
Senior Secured Bonds
Percent of net assets (percent)		0.60%	[5]	5.40%	[1]
Amortized Cost		$ 10,064	[5]	$ 82,793	[1]
Fair Value		$ 10,074	[5],[6]	$ 84,468	[1],[7]
Unsecured Debt
Percent of net assets (percent)	[5]	13.70%
Amortized Cost	[5]	$ 253,675
Fair Value	[5],[6]	$ 241,418
Preferred Equity
Percent of net assets (percent)		22.80%	[5],[15]	16.60%	[1],[16]
Amortized Cost		$ 425,182	[5],[15]	$ 252,450	[1],[16]
Fair Value		$ 400,414	[5],[6],[15]	$ 259,990	[1],[7],[16]
Sustainable Infrastructure Investments, LLC
Percent of net assets (percent)		2.90%	[5]	2.50%	[1]
Amortized Cost		$ 54,514	[5]	$ 43,150	[1]
Fair Value		$ 51,098	[5],[6]	$ 39,427	[1],[7]
Equity/Other
Percent of net assets (percent)		28.20%	[5],[15]	15.30%	[1]
Amortized Cost		$ 333,510		$ 211,461	[1]
Fair Value		494,195	[6]	$ 238,729	[1],[7]
Short-Term Investments
Percent of net assets (percent)	[1]			1.30%
Amortized Cost		0		$ 20,994	[1]
Fair Value		$ 0		$ 21,000	[1],[7]
Cash and Cash Equivalents
Percent of net assets (percent)	[1]			31.10%
Investment, Identifier [Axis]: AI Aqua Merger Sub, Inc., Capital Goods 1
Variable Rate (percent)	[1],[11],[17],[18]			4.25%
Floor Rate (percent)	[1],[11],[17],[18]			0.50%
Principal amount	[1],[17],[18],[19]			$ 16,522
Amortized Cost	[1],[17],[18]			16,398
Fair Value	[1],[7],[17],[18]			$ 16,625
Investment, Identifier [Axis]: AI Aqua Merger Sub, Inc., Capital Goods 2
Variable Rate (percent)	[1],[11],[18],[20]			4.25%
Floor Rate (percent)	[1],[11],[18],[20]			0.50%
Principal amount	[1],[18],[19],[20]			$ 3,478
Amortized Cost	[1],[18],[20]			3,452
Fair Value	[1],[7],[18],[20]			$ 3,500
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Energy—Power
Variable Rate (percent)	[1],[11],[21],[22],[23]			4%
PIK Rate (percent)	[1],[11],[21],[22],[23]			3%
Floor Rate (percent)	[1],[11],[21],[22],[23]			1.50%
Principal amount	[1],[19],[21],[22],[23]			$ 22,856
Amortized Cost	[1],[21],[22],[23]			20,779
Fair Value	[1],[7],[21],[22],[23]			$ 23,050
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Energy—Power \| Maximum
PIK Rate (percent)	[1],[11],[21],[22],[23]			3%
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 1
Variable Rate (percent)	[2],[4],[5],[24],[25]	4%
PIK Rate (percent)	[2],[4],[5],[24],[25]	3%
Floor Rate (percent)	[2],[4],[5],[24],[25]	1.50%
Principal amount	[4],[5],[24],[25],[26]	$ 22,734
Amortized Cost	[4],[5],[24],[25]	20,082
Fair Value	[4],[5],[6],[24],[25]	$ 23,519
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 1 \| Maximum
PIK Rate (percent)	[2],[4],[5],[24],[25]	3%
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 2
Variable Rate (percent)	[2],[3],[4],[5],[24],[25]	4%
PIK Rate (percent)	[2],[3],[4],[5],[24],[25]	3%
Floor Rate (percent)	[2],[3],[4],[5],[24],[25]	1.50%
Principal amount	[3],[4],[5],[24],[25],[26]	$ 5,359
Amortized Cost	[3],[4],[5],[24],[25]	5,359
Fair Value	[3],[4],[5],[6],[24],[25]	$ 5,545
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 2 \| Maximum
PIK Rate (percent)	[2],[3],[4],[5],[24],[25]	3%
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Warrants, Strike: $1.00, Energy—Power
Number of Shares/Units \| shares	[1],[21],[22],[23],[27]			35
Amortized Cost	[1],[21],[22],[23],[27]			$ 2,652
Fair Value	[1],[7],[21],[22],[23],[27]			$ 0
Strike price (in dollars per share) \| $ / shares	[1],[22],[23],[27]			$ 1
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Warrants, Strike: $1.00, Power
Number of Shares/Units \| shares	[4],[5],[15],[24],[25],[28],[29]	35
Amortized Cost	[4],[5],[15],[24],[25],[28],[29]	$ 2,652
Fair Value	[4],[5],[6],[15],[24],[25],[28],[29]	$ 1,630
Strike price (in dollars per share) \| $ / shares	[4],[5],[24],[25],[28],[29]	$ 1
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Equity, Energy—Service & Equipment
Number of Shares/Units \| shares	[1],[21],[27]			6,944,444
Amortized Cost	[1],[21],[27]			$ 6,944
Fair Value	[1],[7],[21],[27]			$ 1,375
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Equity, Service & Equipment
Number of Shares/Units \| shares	[4],[5],[15],[28],[29]	6,944,444
Amortized Cost	[4],[5],[15],[28],[29]	$ 6,944
Fair Value	[4],[5],[6],[15],[28],[29]	$ 1,219
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Equity , Energy—Service & Equipment
Number of Shares/Units \| shares	[1],[16],[21],[27]			28,942,003
Amortized Cost	[1],[16],[21],[27]			$ 1,447
Fair Value	[1],[7],[16],[21],[27]			$ 10,159
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Equity, Service & Equipment
Number of Shares/Units \| shares	[4],[5],[15],[28],[29]	28,942,003
Amortized Cost	[4],[5],[15],[28],[29]	$ 1,447
Fair Value	[4],[5],[6],[15],[28],[29]	$ 8,321
Investment, Identifier [Axis]: Acrisure, LLC, Insurance
Variable Rate (percent)	[1],[11],[17]			4.50%
Principal amount	[1],[17],[19]			$ 20,175
Amortized Cost	[1],[17]			20,033
Fair Value	[1],[7],[17]			$ 20,251
Investment, Identifier [Axis]: Aethon III BR LLC, Upstream
Variable Rate (percent)	[2],[4],[5],[29]	7.50%
Floor Rate (percent)	[2],[4],[5],[29]	1.50%
Principal amount	[4],[5],[26],[29]	$ 20,000
Amortized Cost	[4],[5],[29]	19,848
Fair Value	[4],[5],[6],[29]	$ 20,138
Investment, Identifier [Axis]: Aethon United BR LP, Upstream
Rate (percent)	[2],[5],[29]	8.30%
Principal amount	[5],[26],[29]	$ 40,500
Amortized Cost	[5],[29]	40,500
Fair Value	[5],[6],[29]	40,221
Investment, Identifier [Axis]: Aimbridge Acquisition Co. Inc., Consumer Services
Variable Rate (percent)	[1],[11],[17]			3.75%
Principal amount	[1],[17],[19]			$ 21,805
Amortized Cost	[1],[17]			21,036
Fair Value	[1],[7],[17]			$ 20,380
Investment, Identifier [Axis]: AirSwift Holdings, Ltd., Common Equity, Commercial & Professional Services
Number of Shares/Units \| shares	[1],[21],[23],[27]			3,750,000
Amortized Cost	[1],[21],[23],[27]			$ 6,029
Fair Value	[1],[7],[21],[23],[27]			$ 3,413
Investment, Identifier [Axis]: Allegiant Travel Co., Transportation
Rate (percent)	[1],[11],[23]			7.30%
Principal amount	[1],[19],[23]			$ 10,601
Amortized Cost	[1],[23]			9,614
Fair Value	[1],[7],[23]			10,385
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC
Fair Value		$ 8,436		$ 0		$ 7,782
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 1
PIK Rate (percent)	[2],[4],[5],[29],[30]	8%
Principal amount	[4],[5],[26],[29],[30]	$ 8,436
Amortized Cost	[4],[5],[29],[30]	8,436
Fair Value	[4],[5],[6],[29],[30]	$ 8,436
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 1 \| Maximum
PIK Rate (percent)	[2],[4],[5],[29],[30]	8%
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 2
PIK Rate (percent)	[2],[3],[4],[5],[30]	8%
Principal amount	[3],[4],[5],[26],[30]	$ 2,500
Amortized Cost	[3],[4],[5],[30]	2,500
Fair Value	[3],[4],[5],[6],[30]	$ 2,500
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 2 \| Maximum
PIK Rate (percent)	[2],[3],[4],[5],[30]	8%
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 1
Variable Rate (percent)	[1],[11],[17]			4.75%
Floor Rate (percent)	[1],[11],[17]			0.50%
Principal amount	[1],[17],[19]			$ 9,975
Amortized Cost	[1],[17]			9,841
Fair Value	[1],[7],[17]			$ 9,998
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 2
Variable Rate (percent)	[1],[11],[17]			3.75%
Floor Rate (percent)	[1],[11],[17]			0.50%
Principal amount	[1],[17],[19]			$ 9,929
Amortized Cost	[1],[17]			9,627
Fair Value	[1],[7],[17]			9,903
Investment, Identifier [Axis]: Allied Wireline Services, LLC
Fair Value		$ 63,888		22,200		46,339
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity
Fair Value		$ 10,463		$ 0		0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity, Energy—Service & Equipment
Number of Shares/Units \| shares	[1],[21],[27],[31],[32]			48,400
Amortized Cost	[1],[21],[27],[31],[32]			$ 1,527
Fair Value	[1],[7],[21],[27],[31],[32]			$ 0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity, Service & Equipment
Number of Shares/Units \| shares	[4],[5],[15],[28],[29],[30],[33]	48,400
Amortized Cost	[4],[5],[15],[28],[29],[30],[33]	$ 1,527
Fair Value	[4],[5],[6],[15],[28],[29],[30],[33]	$ 10,463
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Energy—Service & Equipment
PIK Rate (percent)	[1],[11],[21],[27],[32],[34]			10%
Principal amount	[1],[19],[21],[27],[32],[34]			$ 70,277
Amortized Cost	[1],[21],[27],[32],[34]			70,277
Fair Value	[1],[7],[21],[27],[32],[34]			$ 22,200
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Energy—Service & Equipment \| Maximum
PIK Rate (percent)	[1],[11],[21],[27],[32],[34]			10%
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Service & Equipment
PIK Rate (percent)	[2],[4],[5],[29],[30]	10%
Principal amount	[4],[5],[26],[29],[30]	$ 63,888
Amortized Cost	[4],[5],[29],[30]	63,888
Fair Value	[4],[5],[6],[29],[30]	$ 63,888
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Service & Equipment \| Maximum
PIK Rate (percent)	[2],[4],[5],[29],[30]	10%
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants
Fair Value		$ 0		$ 0		0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants, Energy—Service & Equipment
Number of Shares/Units \| shares	[1],[21],[27],[31],[32]			22,000
Amortized Cost	[1],[21],[27],[31],[32]			$ 0
Fair Value	[1],[7],[21],[27],[31],[32]			$ 0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants, Service & Equipment
Number of Shares/Units \| shares	[4],[5],[15],[28],[29],[30],[33]	22,000
Amortized Cost	[4],[5],[15],[28],[29],[30],[33]	$ 0
Fair Value	[4],[5],[6],[15],[28],[29],[30],[33]	$ 0
Investment, Identifier [Axis]: Allspring Government Money Market Fund - Select Class, Money Market Fund
Rate (percent)	[1],[11]			5.30%
Fair Value	[1],[7]			$ 23,098
Investment, Identifier [Axis]: American Auto Auction Group, LLC, Capital Goods
Variable Rate (percent)	[1],[11],[17]			5%
Floor Rate (percent)	[1],[11],[17]			0.80%
Principal amount	[1],[17],[19]			$ 9,975
Amortized Cost	[1],[17]			9,752
Fair Value	[1],[7],[17]			$ 9,858
Investment, Identifier [Axis]: Archrock Partners, L.P., Midstream
Rate (percent)	[2],[5],[25],[29]	6.30%
Principal amount	[5],[25],[26],[29]	$ 3,098
Amortized Cost	[5],[25],[29]	3,168
Fair Value	[5],[6],[25],[29]	$ 2,840
Investment, Identifier [Axis]: Arena Energy, LP, Contingent Value Rights, Energy—Upstream
Number of Shares/Units \| shares	[1],[21],[27]			126,632,117
Amortized Cost	[1],[21],[27]			$ 351
Fair Value	[1],[7],[21],[27]			$ 571
Investment, Identifier [Axis]: Arena Energy, LP, Contingent Value Rights, Upstream
Number of Shares/Units \| shares	[4],[5],[15],[28],[29]	126,632,117
Amortized Cost	[4],[5],[15],[28],[29]	$ 351
Fair Value	[4],[5],[6],[15],[28],[29]	$ 858
Investment, Identifier [Axis]: Aretec Escrow Issuer Inc., Financial Services
Rate (percent)	[1],[11],[17]			10%
Principal amount	[1],[17],[19]			$ 7,000
Amortized Cost	[1],[17]			7,000
Fair Value	[1],[7],[17]			$ 7,447
Investment, Identifier [Axis]: Aretec Group, Inc., Financial Services
Variable Rate (percent)	[1],[11],[17],[18]			4.50%
Principal amount	[1],[17],[18],[19]			$ 9,352
Amortized Cost	[1],[17],[18]			9,071
Fair Value	[1],[7],[17],[18]			$ 9,358
Investment, Identifier [Axis]: Ascent Resources Utica Holdings, LLC, Common Equity, Energy—Upstream
Number of Shares/Units \| shares	[1],[21],[27],[31]			1,486,929
Amortized Cost	[1],[21],[27],[31]			$ 44,573
Fair Value	[1],[7],[21],[27],[31]			$ 39,545
Investment, Identifier [Axis]: Ascent Resources Utica Holdings, LLC, Common Equity, Upstream
Number of Shares/Units \| shares	[4],[5],[15],[28],[29],[33]	148,692,948
Amortized Cost	[4],[5],[15],[28],[29],[33]	$ 44,700
Fair Value	[4],[5],[6],[15],[28],[29],[33]	$ 52,340
Investment, Identifier [Axis]: Auris Luxembourg III S.a r.l, Health Care Equipment & Services
Variable Rate (percent)	[1],[11],[17],[23]			3.75%
Principal amount	[1],[17],[19],[23]			$ 20,287
Amortized Cost	[1],[17],[23]			19,912
Fair Value	[1],[7],[17],[23]			$ 20,079
Investment, Identifier [Axis]: Aveanna Healthcare LLC, Health Care Equipment & Services
Variable Rate (percent)	[1],[11],[17]			3.75%
Floor Rate (percent)	[1],[11],[17]			0.50%
Principal amount	[1],[17],[19]			$ 15,909
Amortized Cost	[1],[17]			14,054
Fair Value	[1],[7],[17]			$ 14,852
Investment, Identifier [Axis]: BCPE Empire Holdings, Inc., Consumer Services
Variable Rate (percent)	[1],[11],[17]			4.75%
Floor Rate (percent)	[1],[11],[17]			0.50%
Principal amount	[1],[17],[19]			$ 24,900
Amortized Cost	[1],[17]			24,983
Fair Value	[1],[7],[17]			$ 24,998
Investment, Identifier [Axis]: Brazos Delaware II LLC, Midstream
Variable Rate (percent)	[2],[5]	4%
Principal amount	[5],[26]	$ 39,259
Amortized Cost	[5]	38,085
Fair Value	[5],[6]	$ 39,137
Investment, Identifier [Axis]: CCS-CMGC Holdings, Inc., Health Care Equipment & Services
Variable Rate (percent)	[1],[11],[17]			5.50%
Principal amount	[1],[17],[19]			$ 21,465
Amortized Cost	[1],[17]			18,225
Fair Value	[1],[7],[17]			$ 18,222
Investment, Identifier [Axis]: CPM Holdings, Inc., Capital Goods
Variable Rate (percent)	[1],[11],[17]			4.50%
Floor Rate (percent)	[1],[11],[17]			0.50%
Principal amount	[1],[17],[19]			$ 20,000
Amortized Cost	[1],[17]			20,038
Fair Value	[1],[7],[17]			$ 20,092
Investment, Identifier [Axis]: CPV Maryland, LLC, Power
Variable Rate (percent)	[2],[5]	4%
Floor Rate (percent)	[2],[5]	1%
Principal amount	[5],[26]	$ 14,286
Amortized Cost	[5]	14,146
Fair Value	[5],[6]	$ 14,155
Investment, Identifier [Axis]: CPV Shore Holdings LLC, Power
Variable Rate (percent)	[2],[5]	3.75%
Principal amount	[5],[26]	$ 23,601
Amortized Cost	[5]	22,760
Fair Value	[5],[6]	$ 21,935
Investment, Identifier [Axis]: Charlotte Buyer, Inc., Health Care Equipment & Services
Variable Rate (percent)	[1],[11],[17],[18]			5.25%
Floor Rate (percent)	[1],[11],[17],[18]			0.50%
Principal amount	[1],[17],[18],[19]			$ 19,845
Amortized Cost	[1],[17],[18]			19,937
Fair Value	[1],[7],[17],[18]			$ 19,952
Investment, Identifier [Axis]: Cimarron Energy Holdco Inc., Common Equity, Service & Equipment
Number of Shares/Units \| shares	[4],[5],[15],[28],[29]	4,302,293
Amortized Cost	[4],[5],[15],[28],[29]	$ 3,950
Fair Value	[4],[5],[6],[15],[28],[29]	$ 0
Investment, Identifier [Axis]: Cimarron Energy Holdco Inc., Participation Option, Service & Equipment
Number of Shares/Units \| shares	[4],[5],[15],[28],[29]	25,000,000
Amortized Cost	[4],[5],[15],[28],[29]	$ 1,289
Fair Value	[4],[5],[6],[15],[28],[29]	$ 0
Investment, Identifier [Axis]: Cimarron Energy Inc., Service & Equipment
Variable Rate (percent)	[2],[4],[5],[28],[29],[35]	9%
Floor Rate (percent)	[2],[4],[5],[28],[29],[35]	1%
Principal amount	[4],[5],[26],[28],[29],[35]	$ 7,500
Amortized Cost	[4],[5],[28],[29],[35]	6,563
Fair Value	[4],[5],[6],[28],[29],[35]	$ 3,713
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services
Variable Rate (percent)	[1],[11],[17],[21]			6.75%
Floor Rate (percent)	[1],[11],[17],[21]			1%
Principal amount	[1],[17],[19],[21]			$ 20,915
Amortized Cost	[1],[17],[21]			20,915
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services1
Fair Value	[1],[7],[17],[21]			$ 21,098
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services2
Variable Rate (percent)	[1],[11],[20],[21]			6.75%
Floor Rate (percent)	[1],[11],[20],[21]			1%
Principal amount	[1],[19],[20],[21]			$ 2,688
Amortized Cost	[1],[20],[21]			2,688
Fair Value	[1],[7],[20],[21]			$ 2,712
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services3
Variable Rate (percent)	[1],[11],[20],[21]			6.75%
Floor Rate (percent)	[1],[11],[20],[21]			1%
Principal amount	[1],[19],[20],[21]			$ 1,344
Amortized Cost	[1],[20],[21]			1,344
Fair Value	[1],[7],[20],[21]			$ 1,356
Investment, Identifier [Axis]: Cirque Du Soleil Holding USA Newco, Inc., Financial Services
Variable Rate (percent)	[1],[11],[17],[18]			4.25%
Floor Rate (percent)	[1],[11],[17],[18]			0.50%
Principal amount	[1],[17],[18],[19]			$ 6,387
Amortized Cost	[1],[17],[18]			6,331
Fair Value	[1],[7],[17],[18]			$ 6,372
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Energy—Upstream
Variable Rate (percent)	[1],[11],[17],[21]			7.65%
Floor Rate (percent)	[1],[11],[17],[21]			1%
Principal amount	[1],[17],[19],[21]			$ 35,000
Amortized Cost	[1],[17],[21]			34,527
Fair Value	[1],[7],[17],[21]			$ 34,426
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Upstream
Variable Rate (percent)	[2],[4],[5],[29]	7.65%
Floor Rate (percent)	[2],[4],[5],[29]	1%
Principal amount	[4],[5],[26],[29]	$ 39,000
Amortized Cost	[4],[5],[29]	38,440
Fair Value	[4],[5],[6],[29]	$ 38,240
Investment, Identifier [Axis]: Clear Channel Outdoor Holdings, Inc., Media & Entertainment
Variable Rate (percent)	[1],[11],[17],[23]			3.50%
Principal amount	[1],[17],[19],[23]			$ 20,000
Amortized Cost	[1],[17],[23]			19,551
Fair Value	[1],[7],[17],[23]			$ 19,829
Investment, Identifier [Axis]: Clydesdale Acquisition Holdings Inc., Financials Services
Variable Rate (percent)	[1],[11],[17]			4.18%
Floor Rate (percent)	[1],[11],[17]			0.50%
Principal amount	[1],[17],[19]			$ 19,949
Amortized Cost	[1],[17]			19,740
Fair Value	[1],[7],[17]			$ 20,061
Investment, Identifier [Axis]: Compass Power Generation LLC, Power
Variable Rate (percent)	[2],[5]	4.25%
Floor Rate (percent)	[2],[5]	1%
Principal amount	[5],[26]	$ 31,575
Amortized Cost	[5]	30,712
Fair Value	[5],[6]	$ 31,384
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Energy—Upstream
Rate (percent)	[1],[11],[12],[21],[36]			12.90%
Principal amount	[1],[12],[19],[21],[36]			$ 100,000
Amortized Cost	[1],[12],[21],[36]			1,129
Fair Value	[1],[7],[12],[21],[36]			$ 1,234
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Upstream
Rate (percent)	[2],[4],[5],[14],[37]	12.90%
Principal amount	[4],[5],[14],[26],[37]	$ 100,000
Amortized Cost	[4],[5],[14],[37]	11,081
Fair Value	[4],[5],[6],[14],[37]	$ 20,683
Investment, Identifier [Axis]: Crown SubSea Communications Holding, Inc., Capital Goods 1
Variable Rate (percent)	[1],[11],[17],[18]			5%
Floor Rate (percent)	[1],[11],[17],[18]			0.80%
Principal amount	[1],[17],[18],[19]			$ 4,500
Amortized Cost	[1],[17],[18]			4,523
Fair Value	[1],[7],[17],[18]			$ 4,534
Investment, Identifier [Axis]: Crown SubSea Communications Holding, Inc., Capital Goods 2
Variable Rate (percent)	[1],[11],[17],[18]			5.25%
Floor Rate (percent)	[1],[11],[17],[18]			0.80%
Principal amount	[1],[17],[18],[19]			$ 5,430
Amortized Cost	[1],[17],[18]			5,445
Fair Value	[1],[7],[17],[18]			$ 5,468
Investment, Identifier [Axis]: EIF Van Hook Holdings, LLC, Midstream
Variable Rate (percent)	[2],[5]	5.25%
Principal amount	[5],[26]	$ 26,882
Amortized Cost	[5]	26,609
Fair Value	[5],[6]	$ 26,075
Investment, Identifier [Axis]: ERA II Minerals, LLC, Upstream
Variable Rate (percent)	[2],[4],[5],[29]	6.25%
Floor Rate (percent)	[2],[4],[5],[29]	0.80%
Principal amount	[4],[5],[26],[29]	$ 37,000
Amortized Cost	[4],[5],[29]	36,601
Fair Value	[4],[5],[6],[29]	$ 36,656
Investment, Identifier [Axis]: Earthstone Energy Holdings, LLC, Upstream
Rate (percent)	[2],[5],[25]	8%
Principal amount	[5],[25],[26]	$ 11,400
Amortized Cost	[5],[25]	11,400
Fair Value	[5],[6],[25]	$ 10,920
Investment, Identifier [Axis]: Endeavor Energy Resources, L.P., Upstream
Rate (percent)	[2],[5],[29]	5.80%
Principal amount	[5],[26],[29]	$ 24,299
Amortized Cost	[5],[29]	25,388
Fair Value	[5],[6],[29]	$ 23,306
Investment, Identifier [Axis]: Engineered Machinery Holdings, Inc., Capital Goods
Variable Rate (percent)	[1],[11],[17]			3.50%
Floor Rate (percent)	[1],[11],[17]			0.80%
Principal amount	[1],[17],[19]			$ 19,924
Amortized Cost	[1],[17]			19,847
Fair Value	[1],[7],[17]			$ 19,840
Investment, Identifier [Axis]: FR BR Holdings LLC, Midstream
Variable Rate (percent)	[2],[4],[5],[29]	6.50%
Principal amount	[4],[5],[26],[29]	$ 81,582
Amortized Cost	[4],[5],[29]	80,371
Fair Value	[4],[5],[6],[29]	$ 81,361
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Energy—Midstream
Variable Rate (percent)	[1],[11],[17],[21]			7.50%
Floor Rate (percent)	[1],[11],[17],[21]			0.50%
Principal amount	[1],[17],[19],[21]			$ 17,047
Amortized Cost	[1],[17],[21]			16,855
Fair Value	[1],[7],[17],[21]			$ 17,156
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Midstream
Variable Rate (percent)	[2],[4],[5]	7.50%
Floor Rate (percent)	[2],[4],[5]	0.50%
Principal amount	[4],[5],[26]	$ 17,347
Amortized Cost	[4],[5]	17,103
Fair Value	[4],[5],[6]	$ 17,406
Investment, Identifier [Axis]: First Brands Group, LLC, Automobiles & Components
Variable Rate (percent)	[1],[11],[17]			5%
Floor Rate (percent)	[1],[11],[17]			1%
Principal amount	[1],[17],[19]			$ 19,905
Amortized Cost	[1],[17]			19,620
Fair Value	[1],[7],[17]			$ 19,781
Investment, Identifier [Axis]: Full House Resorts, Inc., Consumer Services
Rate (percent)	[1],[11],[17]			8.30%
Principal amount	[1],[17],[19]			$ 20,742
Amortized Cost	[1],[17]			18,561
Fair Value	[1],[7],[17]			19,517
Investment, Identifier [Axis]: GIP II Blue Holding LP, Midstream
Variable Rate (percent)	[2],[5]	4.50%
Floor Rate (percent)	[2],[5]	1%
Principal amount	[5],[26]	$ 5,918
Amortized Cost	[5]	5,842
Fair Value	[5],[6]	5,877
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity
Fair Value		$ 5,044		$ 1,661		0
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity, Energy—Midstream
Number of Shares/Units \| shares	[1],[21],[27],[31],[38]			105,785
Amortized Cost	[1],[21],[27],[31],[38]			$ 6,681
Fair Value	[1],[7],[21],[27],[31],[38]			$ 1,661
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity, Midstream
Number of Shares/Units \| shares	[4],[5],[15],[28],[29],[33],[39]	105,785
Amortized Cost	[4],[5],[15],[28],[29],[33],[39]	$ 6,681
Fair Value	[4],[5],[6],[15],[28],[29],[33],[39]	$ 5,044
Investment, Identifier [Axis]: GasLog Ltd., Energy—Midstream
Rate (percent)	[1],[11],[21]			7.80%
Principal amount	[1],[19],[21]			$ 13,951
Amortized Cost	[1],[21]			13,874
Fair Value	[1],[7],[21]			$ 13,510
Investment, Identifier [Axis]: GasLog Ltd., Midstream
Variable Rate (percent)	[2],[4],[5],[25]	7.75%
Principal amount	[4],[5],[25],[26]	$ 14,648
Amortized Cost	[4],[5],[25]	14,556
Fair Value	[4],[5],[6],[25]	$ 14,010
Investment, Identifier [Axis]: Generation Bridge LLC, Power 1
Variable Rate (percent)	[2],[5]	5%
Floor Rate (percent)	[2],[5]	0.80%
Principal amount	[5],[26]	$ 7,432
Amortized Cost	[5]	7,305
Fair Value	[5],[6]	$ 7,385
Investment, Identifier [Axis]: Generation Bridge LLC, Power 2
Variable Rate (percent)	[2],[5]	5%
Floor Rate (percent)	[2],[5]	0.80%
Principal amount	[5],[26]	$ 163
Amortized Cost	[5]	160
Fair Value	[5],[6]	$ 162
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Commercial & Professional Services 1
Number of Shares/Units \| shares	[1],[16],[21],[27]			2,785,562
Amortized Cost	[1],[16],[21],[27]			$ 2,786
Fair Value	[1],[7],[16],[21],[27]			$ 0
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Commercial & Professional Services 2
PIK Rate (percent)	[1],[11],[16],[21],[27],[34]			9%
Number of Shares/Units \| shares	[1],[16],[21],[27],[34]			19,965
Amortized Cost	[1],[16],[21],[27],[34]			$ 12,493
Fair Value	[1],[7],[16],[21],[27],[34]			$ 10,357
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Commercial & Professional Services 2 \| Maximum
PIK Rate (percent)	[1],[11],[16],[21],[27],[34]			9%
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Professional Services 1
Number of Shares/Units \| shares	[4],[5],[15],[28],[29]	2,785,562
Amortized Cost	[4],[5],[15],[28],[29]	$ 2,786
Fair Value	[4],[5],[6],[15],[28],[29]	$ 0
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Professional Services 2
PIK Rate (percent)	[4],[5],[15],[28],[29],[35]	9%
Number of Shares/Units \| shares	[4],[5],[15],[28],[29],[35]	18,296
Amortized Cost	[4],[5],[15],[28],[29],[35]	$ 12,493
Fair Value	[4],[5],[6],[15],[28],[29],[35]	$ 9,377
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Professional Services 2 \| Maximum
PIK Rate (percent)	[4],[5],[15],[28],[29],[35]	9%
Investment, Identifier [Axis]: Gold Rush Amusements, Inc., Consumer Services
Variable Rate (percent)	[1],[11],[17],[21]			7.50%
Floor Rate (percent)	[1],[11],[17],[21]			2%
Principal amount	[1],[17],[19],[21]			$ 30,673
Amortized Cost	[1],[17],[21]			30,079
Fair Value	[1],[7],[17],[21]			$ 30,059
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Energy—Midstream
Variable Rate (percent)	[1],[11],[17],[21]			7%
Floor Rate (percent)	[1],[11],[17],[21]			0.50%
Principal amount	[1],[17],[19],[21]			$ 14,516
Amortized Cost	[1],[17],[21]			14,326
Fair Value	[1],[7],[17],[21]			$ 14,379
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Midstream
Variable Rate (percent)	[2],[4],[5]	7.25%
Floor Rate (percent)	[2],[4],[5]	0.50%
Principal amount	[4],[5],[26]	$ 14,963
Amortized Cost	[4],[5]	14,752
Fair Value	[4],[5],[6]	14,819
Investment, Identifier [Axis]: Great Western Petroleum, LLC
Fair Value		0				58,055
Investment, Identifier [Axis]: Great Western Petroleum, LLC, Common Equity
Fair Value		$ 0				40,731
Investment, Identifier [Axis]: Guardian US Holdco, LLC, Financial Services
Variable Rate (percent)	[1],[11],[17]			4%
Floor Rate (percent)	[1],[11],[17]			0.50%
Principal amount	[1],[17],[19]			$ 19,925
Amortized Cost	[1],[17]			19,922
Fair Value	[1],[7],[17]			$ 20,008
Investment, Identifier [Axis]: Guitar Center, Inc., Consumer Discretionary Distribution & Retail
Rate (percent)	[1],[11],[17]			8.50%
Principal amount	[1],[17],[19]			$ 20,000
Amortized Cost	[1],[17]			17,987
Fair Value	[1],[7],[17]			17,473
Investment, Identifier [Axis]: Hamilton Intermediate Holdings, LLC, Power
PIK Rate (percent)	[2],[4],[5]	16.50%
Principal amount	[4],[5],[26]	$ 30,391
Amortized Cost	[4],[5]	31,075
Fair Value	[4],[5],[6]	$ 31,007
Investment, Identifier [Axis]: Hamilton Intermediate Holdings, LLC, Power \| Maximum
PIK Rate (percent)	[2],[4],[5]	16.50%
Investment, Identifier [Axis]: Hammerhead Resources Inc., Upstream
PIK Rate (percent)	[2],[4],[5],[25],[29]	12%
Principal amount	[4],[5],[25],[26],[29]	$ 35,118
Amortized Cost	[4],[5],[25],[29]	34,961
Fair Value	[4],[5],[6],[25],[29]	$ 35,118
Investment, Identifier [Axis]: Hammerhead Resources Inc., Upstream \| Maximum
PIK Rate (percent)	[2],[4],[5],[25],[29]	12%
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity
Fair Value		$ 810		$ 271		2,836
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity, Energy—Upstream
Number of Shares/Units \| shares	[1],[27],[38]			135,062
Amortized Cost	[1],[27],[38]			$ 14,418
Fair Value	[1],[7],[27],[38]			$ 271
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity, Upstream
Number of Shares/Units \| shares	[5],[15],[28],[29],[39]	135,062
Amortized Cost	[5],[15],[28],[29],[39]	$ 15,059
Fair Value	[5],[6],[15],[28],[29],[39]	810
Investment, Identifier [Axis]: Knowlton Development Corporation Inc., Household & Personal Products
Variable Rate (percent)	[1],[11],[17]			5%
Principal amount	[1],[17],[19]			$ 21,000
Amortized Cost	[1],[17]			20,370
Fair Value	[1],[7],[17]			$ 20,858
Investment, Identifier [Axis]: LABL, Inc., Commerical & Professional Services
Variable Rate (percent)	[1],[11],[17]			5%
Floor Rate (percent)	[1],[11],[17]			0.50%
Principal amount	[1],[17],[19]			$ 19,864
Amortized Cost	[1],[17]			19,335
Fair Value	[1],[7],[17]			$ 19,106
Investment, Identifier [Axis]: Learning Care Group No. 2 Inc., Consumer Services
Variable Rate (percent)	[1],[11],[17]			4.75%
Floor Rate (percent)	[1],[11],[17]			0.50%
Principal amount	[1],[17],[19]			$ 19,950
Amortized Cost	[1],[17]			20,070
Fair Value	[1],[7],[17]			20,100
Investment, Identifier [Axis]: Limetree Bay Energy, LLC
Fair Value		0				3,166
Investment, Identifier [Axis]: Limetree Bay Energy, LLC, Class A Units
Fair Value		$ 1,885		$ 0		6,046
Investment, Identifier [Axis]: Limetree Bay Energy, LLC, Class A Units, Midstream
Number of Shares/Units \| shares	[4],[5],[15],[28],[29],[39]	76,938,973
Amortized Cost	[4],[5],[15],[28],[29],[39]	$ 21,458
Fair Value	[4],[5],[6],[15],[28],[29],[39]	$ 1,885
Investment, Identifier [Axis]: MB Precision Investment Holdings LLC, Class A-2 Units, Industrials
Number of Shares/Units \| shares	[4],[5],[15],[28],[29],[33]	1,426,110
Amortized Cost	[4],[5],[15],[28],[29],[33]	$ 490
Fair Value	[4],[5],[6],[15],[28],[29],[33]	0
Investment, Identifier [Axis]: MECO IV Holdco, LLC
Fair Value		0				22,745
Investment, Identifier [Axis]: MECO IV Holdco, LLC, Class A-1 Units
Fair Value		$ 0				4,181
Investment, Identifier [Axis]: Maverick Natural Resources, LLC, Common Equity, Energy—Upstream
Number of Shares/Units \| shares	[1],[21],[27],[31]			503,176
Amortized Cost	[1],[21],[27],[31]			$ 93,044
Fair Value	[1],[7],[21],[27],[31]			$ 164,040
Investment, Identifier [Axis]: Maverick Natural Resources, LLC, Common Equity, Upstream
Number of Shares/Units \| shares	[4],[5],[15],[29],[33]	503,176
Amortized Cost	[4],[5],[15],[29],[33]	$ 138,208
Fair Value	[4],[5],[6],[15],[29],[33]	$ 312,372
Investment, Identifier [Axis]: Mavis Tire Express Services TopCo, L.P., Consumer Discretionary Distribution & Retail
Variable Rate (percent)	[1],[11],[17]			4%
Floor Rate (percent)	[1],[11],[17]			0.80%
Principal amount	[1],[17],[19]			$ 19,893
Amortized Cost	[1],[17]			19,797
Fair Value	[1],[7],[17]			$ 19,955
Investment, Identifier [Axis]: Medallion Midland Acquisition LP, Midstream
Variable Rate (percent)	[2],[5]	3.75%
Floor Rate (percent)	[2],[5]	0.80%
Principal amount	[5],[26]	$ 7,920
Amortized Cost	[5]	7,886
Fair Value	[5],[6]	$ 7,862
Investment, Identifier [Axis]: Moss Creek Resources, LLC, Upstream
Rate (percent)	[2],[5],[29]	7.50%
Principal amount	[5],[26],[29]	$ 11,693
Amortized Cost	[5],[29]	10,358
Fair Value	[5],[6],[29]	$ 10,561
Investment, Identifier [Axis]: NGL Energy Partners, LP, Preferred Equity, Energy—Midstream
Rate (percent)	[1],[11],[16],[17],[21],[23],[27],[34]			14.20%
Number of Shares/Units \| shares	[1],[16],[17],[21],[23],[27],[34]			156,250
Amortized Cost	[1],[16],[17],[21],[23],[27],[34]			$ 157,633
Fair Value	[1],[7],[16],[17],[21],[23],[27],[34]			$ 141,141
Investment, Identifier [Axis]: NGL Energy Partners, LP, Preferred Equity, Midstream
Rate (percent)	[4],[5],[15],[25],[28],[29],[35]	14.20%
Number of Shares/Units \| shares	[4],[5],[15],[25],[28],[29],[35]	156,250
Amortized Cost	[4],[5],[15],[25],[28],[29],[35]	$ 157,633
Fair Value	[4],[5],[6],[15],[25],[28],[29],[35]	$ 125,000
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $13.56, Energy—Midstream
Number of Shares/Units \| shares	[1],[21],[23],[27]			546,880
Amortized Cost	[1],[21],[23],[27]			$ 630
Fair Value	[1],[7],[21],[23],[27]			$ 621
Strike price (in dollars per share) \| $ / shares	[1],[21],[23],[27]			$ 13.56
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $13.56, Midstream
Number of Shares/Units \| shares	[4],[5],[25],[28],[29]	546,880
Amortized Cost	[4],[5],[25],[28],[29]	$ 630
Fair Value	[4],[5],[6],[25],[28],[29]	$ 3
Strike price (in dollars per share) \| $ / shares	[4],[5],[25],[28],[29]	$ 13.56
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $14.54, Energy—Midstream
Number of Shares/Units \| shares	[1],[21],[23],[27]			2,187,500
Amortized Cost	[1],[21],[23],[27]			$ 3,083
Fair Value	[1],[7],[21],[23],[27]			$ 2,682
Strike price (in dollars per share) \| $ / shares	[1],[21],[23],[27]			$ 14.54
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $14.54, Midstream
Number of Shares/Units \| shares	[4],[5],[15],[25],[28],[29]	2,187,500
Amortized Cost	[4],[5],[15],[25],[28],[29]	$ 3,083
Fair Value	[4],[5],[6],[15],[25],[28],[29]	$ 10
Strike price (in dollars per share) \| $ / shares	[4],[5],[25],[28],[29]	$ 14.54
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $16.27, Energy—Midstream
Number of Shares/Units \| shares	[1],[21],[23],[27]			781,250
Amortized Cost	[1],[21],[23],[27]			$ 576
Fair Value	[1],[7],[21],[23],[27]			$ 735
Strike price (in dollars per share) \| $ / shares	[1],[21],[23],[27]			$ 16.27
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $16.27, Midstream
Number of Shares/Units \| shares	[4],[5],[15],[25],[28],[29]	781,250
Amortized Cost	[4],[5],[15],[25],[28],[29]	$ 576
Fair Value	[4],[5],[6],[15],[25],[28],[29]	$ 2
Strike price (in dollars per share) \| $ / shares	[4],[5],[25],[28],[29]	$ 16.27
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $17.45, Energy—Midstream
Number of Shares/Units \| shares	[1],[21],[23],[27]			3,125,000
Amortized Cost	[1],[21],[23],[27]			$ 2,623
Fair Value	[1],[7],[21],[23],[27]			$ 3,083
Strike price (in dollars per share) \| $ / shares	[1],[21],[23],[27]			$ 17.45
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $17.45, Midstream
Number of Shares/Units \| shares	[4],[5],[15],[25],[28],[29]	3,125,000
Amortized Cost	[4],[5],[15],[25],[28],[29]	$ 2,623
Fair Value	[4],[5],[6],[15],[25],[28],[29]	$ 8
Strike price (in dollars per share) \| $ / shares	[4],[5],[25],[28],[29]	$ 17.45
Investment, Identifier [Axis]: NRG Energy, Inc., Power
Rate (percent)	[2],[5],[25]	3.90%
Principal amount	[5],[25],[26]	$ 19,125
Amortized Cost	[5],[25]	18,668
Fair Value	[5],[6],[25]	$ 14,401
Investment, Identifier [Axis]: Navios Logistics Finance, Inc., Transportation
Rate (percent)	[1],[11],[17],[23]			10.80%
Principal amount	[1],[17],[19],[23]			$ 20,000
Amortized Cost	[1],[17],[23]			19,680
Fair Value	[1],[7],[17],[23]			$ 19,772
Investment, Identifier [Axis]: Nephron Pharmaceuticals Corp., Pharmaceuticals, Biotechnology & Life Sciences
Variable Rate (percent)	[1],[11],[21]			9%
Floor Rate (percent)	[1],[11],[21]			1.50%
Principal amount	[1],[19],[21]			$ 20,000
Amortized Cost	[1],[21]			19,400
Fair Value	[1],[7],[21]			19,300
Investment, Identifier [Axis]: NuStar, Preferred Equity, Midstream
Rate (percent)	[4],[5],[15],[25],[29]	12.80%
Number of Shares/Units \| shares	[4],[5],[15],[25],[29]	2,640,311
Amortized Cost	[4],[5],[15],[25],[29]	$ 73,114
Fair Value	[4],[5],[6],[15],[25],[29]	$ 83,590
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 1
Variable Rate (percent)	[2],[4],[5]	5.25%
Floor Rate (percent)	[2],[4],[5]	1%
Principal amount	[4],[5],[26]	$ 18,659
Amortized Cost	[4],[5]	18,579
Fair Value	[4],[5],[6]	$ 18,847
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 2
Variable Rate (percent)	[2],[3],[4],[5]	5.25%
Floor Rate (percent)	[2],[3],[4],[5]	1%
Principal amount	[3],[4],[5],[26]	$ 11,341
Amortized Cost	[3],[4],[5]	11,341
Fair Value	[3],[4],[5],[6]	$ 11,455
Investment, Identifier [Axis]: Oryx Midstream Services Permian Basin LLC, Midstream
Variable Rate (percent)	[2],[5],[29]	3.25%
Floor Rate (percent)	[2],[5],[29]	0.50%
Principal amount	[5],[26],[29]	$ 32,357
Amortized Cost	[5],[29]	32,220
Fair Value	[5],[6],[29]	$ 32,026
Investment, Identifier [Axis]: Parkway Generation LLC, Power 1
Variable Rate (percent)	[2],[5]	4.75%
Floor Rate (percent)	[2],[5]	0.80%
Principal amount	[5],[26]	$ 5,760
Amortized Cost	[5]	5,708
Fair Value	[5],[6]	$ 5,700
Investment, Identifier [Axis]: Parkway Generation LLC, Power 2
Variable Rate (percent)	[2],[5]	4.75%
Floor Rate (percent)	[2],[5]	0.80%
Principal amount	[5],[26]	$ 43,910
Amortized Cost	[5]	43,513
Fair Value	[5],[6]	$ 43,285
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 1
Variable Rate (percent)	[2],[4],[5],[29]	6.75%
Floor Rate (percent)	[2],[4],[5],[29]	1.50%
Principal amount	[4],[5],[26],[29]	$ 13,545
Amortized Cost	[4],[5],[29]	13,528
Fair Value	[4],[5],[6],[29]	$ 13,394
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 2
Variable Rate (percent)	[2],[3],[4],[5]	6.75%
Floor Rate (percent)	[2],[3],[4],[5]	1.50%
Principal amount	[3],[4],[5],[26]	$ 1,505
Amortized Cost	[3],[4],[5]	1,505
Fair Value	[3],[4],[5],[6]	1,488
Investment, Identifier [Axis]: Permian Production Holdings, LLC
Fair Value		4,767		4,816		7,889
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity
Fair Value		$ 11,420		$ 748		8,829
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity, Energy—Upstream
Number of Shares/Units \| shares	[1],[21],[27],[31],[38]			1,968,861
Amortized Cost	[1],[21],[27],[31],[38]			$ 5
Fair Value	[1],[7],[21],[27],[31],[38]			$ 748
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity, Upstream
Number of Shares/Units \| shares	[4],[5],[29],[33],[39]	1,968,861
Amortized Cost	[4],[5],[29],[33],[39]	$ 5
Fair Value	[4],[5],[6],[29],[33],[39]	$ 11,420
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Energy—Upstream
Rate (percent)	[1],[11],[21],[38]			7%
PIK Rate (percent)	[1],[11],[21],[38]			2%
Principal amount	[1],[19],[21],[38]			$ 4,864
Amortized Cost	[1],[21],[38]			4,497
Fair Value	[1],[7],[21],[38]			$ 4,816
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Energy—Upstream \| Maximum
PIK Rate (percent)	[1],[11],[21],[38]			2%
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Upstream
Rate (percent)	[2],[4],[5],[29],[39]	7%
PIK Rate (percent)	[2],[4],[5],[29],[39]	2%
Principal amount	[4],[5],[26],[29],[39]	$ 4,767
Amortized Cost	[4],[5],[29],[39]	4,266
Fair Value	[4],[5],[6],[29],[39]	$ 4,767
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Upstream \| Maximum
PIK Rate (percent)	[2],[4],[5],[29],[39]	2%
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 1
Rate (percent)	[2],[5]	7.80%
Principal amount	[5],[26]	$ 26,365
Amortized Cost	[5]	27,511
Fair Value	[5],[6]	$ 25,703
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 2
Rate (percent)	[2],[5],[29]	5.90%
Principal amount	[5],[26],[29]	$ 5,200
Amortized Cost	[5],[29]	5,257
Fair Value	[5],[6],[29]	$ 4,473
Investment, Identifier [Axis]: Phoenix Guarantor Inc., Financial Services
Variable Rate (percent)	[1],[11],[17],[18]			3.50%
Principal amount	[1],[17],[18],[19]			$ 19,923
Amortized Cost	[1],[17],[18]			19,891
Fair Value	[1],[7],[17],[18]			$ 19,951
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 1
Variable Rate (percent)	[2],[4],[5]	6.75%
Floor Rate (percent)	[2],[4],[5]	1%
Principal amount	[4],[5],[26]	$ 9,370
Amortized Cost	[4],[5]	9,304
Fair Value	[4],[5],[6]	$ 9,310
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 2
Variable Rate (percent)	[2],[3],[4],[5]	6.75%
Floor Rate (percent)	[2],[3],[4],[5]	1%
Principal amount	[3],[4],[5],[26]	$ 2,477
Amortized Cost	[3],[4],[5]	2,477
Fair Value	[3],[4],[5],[6]	2,461
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 1
Rate (percent)	[1],[11],[21],[27],[34]			6%
PIK Rate (percent)	[1],[11],[21],[27],[34]			9.50%
Principal amount	[1],[19],[21],[27],[34]			$ 13,297
Amortized Cost	[1],[21],[27],[34]			12,329
Fair Value	[1],[7],[21],[27],[34]			$ 7,473
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 1 \| Maximum
PIK Rate (percent)	[1],[11],[21],[27],[34]			9.50%
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 2
PIK Rate (percent)	[1],[11],[21],[27],[34]			10%
Principal amount	[1],[19],[21],[27],[34]			$ 4,015
Amortized Cost	[1],[21],[27],[34]			3,827
Fair Value	[1],[7],[21],[27],[34]			$ 0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 2 \| Maximum
PIK Rate (percent)	[1],[11],[21],[27],[34]			10%
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Energy—Power
Rate (percent)	[1],[11],[20],[21]			10%
Principal amount	[1],[19],[20],[21]			$ 2,709
Amortized Cost	[1],[20],[21]			2,709
Fair Value	[1],[7],[20],[21]			$ 0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Power
Principal amount	[3],[4],[5],[26]	2,709
Amortized Cost	[3],[4],[5]	2,709
Fair Value	[3],[4],[5],[6]	$ 0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 1
Rate (percent)	[2],[4],[5],[29]	6%
PIK Rate (percent)	[2],[4],[5],[29]	9.50%
Principal amount	[4],[5],[26],[29]	$ 12,121
Amortized Cost	[4],[5],[29]	12,121
Fair Value	[4],[5],[6],[29]	$ 9,997
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 1 \| Maximum
PIK Rate (percent)	[2],[4],[5],[29]	9.50%
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 2
PIK Rate (percent)	[2],[4],[5],[29]	10%
Principal amount	[4],[5],[26],[29]	$ 3,643
Amortized Cost	[4],[5],[29]	3,643
Fair Value	[4],[5],[6],[29]	$ 0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 2 \| Maximum
PIK Rate (percent)	[2],[4],[5],[29]	10%
Investment, Identifier [Axis]: Potomac Energy Center, LLC, Power
Variable Rate (percent)	[2],[4],[5]	6%
Floor Rate (percent)	[2],[4],[5]	0.50%
Principal amount	[4],[5],[26]	$ 58,459
Amortized Cost	[4],[5]	57,508
Fair Value	[4],[5],[6]	$ 58,443
Investment, Identifier [Axis]: Pretium PKG Holdings, Inc., Materials
Variable Rate (percent)	[1],[11],[17]			5%
Floor Rate (percent)	[1],[11],[17]			1%
Principal amount	[1],[17],[19]			$ 30,118
Amortized Cost	[1],[17]			29,634
Fair Value	[1],[7],[17]			$ 29,591
Investment, Identifier [Axis]: Pro Mach Group, Inc., Capital Goods
Variable Rate (percent)	[1],[11],[17]			4%
Floor Rate (percent)	[1],[11],[17]			1%
Principal amount	[1],[17],[19]			$ 19,924
Amortized Cost	[1],[17]			19,979
Fair Value	[1],[7],[17]			$ 20,007
Investment, Identifier [Axis]: Proampac PG Borrower LLC, Materials
Variable Rate (percent)	[1],[11],[17]			4.50%
Floor Rate (percent)	[1],[11],[17]			0.80%
Principal amount	[1],[17],[19]			$ 20,000
Amortized Cost	[1],[17]			19,994
Fair Value	[1],[7],[17]			$ 20,062
Investment, Identifier [Axis]: Ranger Oil Corp., Upstream
Rate (percent)	[2],[5],[25]	9.30%
Principal amount	[5],[25],[26]	$ 29,772
Amortized Cost	[5],[25]	29,633
Fair Value	[5],[6],[25]	29,678
Investment, Identifier [Axis]: Realtruck Group, Inc., Automobiles & Components
Variable Rate (percent)	[1],[11],[17],[18]			3.50%
Floor Rate (percent)	[1],[11],[17],[18]			0.80%
Principal amount	[1],[17],[18],[19]			$ 19,956
Amortized Cost	[1],[17],[18]			19,117
Fair Value	[1],[7],[17],[18]			19,740
Investment, Identifier [Axis]: Ridgeback Resources Inc., Common Equity
Fair Value		$ 41,851		$ 0		48,356
Investment, Identifier [Axis]: Ridgeback Resources Inc., Common Equity, Upstream
Number of Shares/Units \| shares	[4],[5],[25],[29],[39],[40]	9,599,928
Amortized Cost	[4],[5],[25],[29],[39],[40]	$ 46,599
Fair Value	[4],[5],[6],[25],[29],[39],[40]	$ 41,851
Investment, Identifier [Axis]: Ryan, LLC, Commerical & Professional Services
Variable Rate (percent)	[1],[11],[17],[18]			4.50%
Floor Rate (percent)	[1],[11],[17],[18]			0.50%
Principal amount	[1],[17],[18],[19]			$ 9,844
Amortized Cost	[1],[17],[18]			9,868
Fair Value	[1],[7],[17],[18]			$ 9,890
Investment, Identifier [Axis]: Ryan, LLC, Commerical & Professional Services1
Floor Rate (percent)	[1],[11],[18],[20]			0.50%
Principal amount	[1],[18],[19],[20]			$ 1,036
Amortized Cost	[1],[18],[20]			1,039
Fair Value	[1],[7],[18],[20]			$ 1,041
Investment, Identifier [Axis]: Ryan, LLC, Commerical & Professional Services2
Variable Rate (percent)	[1],[11],[18],[20]			4.50%
Investment, Identifier [Axis]: SRS Distribution Inc., Capital Goods
Variable Rate (percent)	[1],[11],[17],[18]			3.50%
Floor Rate (percent)	[1],[11],[17],[18]			0.50%
Principal amount	[1],[17],[18],[19]			$ 19,924
Amortized Cost	[1],[17],[18]			19,729
Fair Value	[1],[7],[17],[18]			$ 19,982
Investment, Identifier [Axis]: ST EIP Holdings Inc., Energy—Midstream
Rate (percent)	[1],[11],[17],[21]			6.30%
Principal amount	[1],[17],[19],[21]			$ 10,365
Amortized Cost	[1],[17],[21]			9,951
Fair Value	[1],[7],[17],[21]			9,874
Investment, Identifier [Axis]: ST EIP Holdings Inc., Midstream
Rate (percent)	[2],[4],[5]	6.30%
Principal amount	[4],[5],[26]	$ 10,526
Amortized Cost	[4],[5]	10,064
Fair Value	[4],[5],[6]	$ 10,074
Investment, Identifier [Axis]: Segreto Power Holdings, LLC, Preferred Equity, Power
Rate (percent)	[4],[5],[15],[28],[29],[33],[35]	13.10%
Number of Shares/Units \| shares	[4],[5],[15],[28],[29],[33],[35]	70,297
Amortized Cost	[4],[5],[15],[28],[29],[33],[35]	$ 99,766
Fair Value	[4],[5],[6],[15],[28],[29],[33],[35]	$ 83,647
Investment, Identifier [Axis]: SilverBow Resources, Inc., Upstream
Variable Rate (percent)	[2],[4],[5],[25],[29]	7.50%
Floor Rate (percent)	[2],[4],[5],[25],[29]	1%
Principal amount	[4],[5],[25],[26],[29]	$ 14,250
Amortized Cost	[4],[5],[25],[29]	14,199
Fair Value	[4],[5],[6],[25],[29]	$ 14,322
Investment, Identifier [Axis]: Sitio Royalties Operating Partnership, LP, Upstream
Variable Rate (percent)	[2],[4],[5],[25],[29]	6.50%
Principal amount	[4],[5],[25],[26],[29]	$ 19,500
Amortized Cost	[4],[5],[25],[29]	19,318
Fair Value	[4],[5],[6],[25],[29]	$ 19,256
Investment, Identifier [Axis]: Suburban Propane Partners LP, Midstream
Rate (percent)	[2],[5],[25],[29]	5%
Principal amount	[5],[25],[26],[29]	$ 7,590
Amortized Cost	[5],[25],[29]	7,837
Fair Value	[5],[6],[25],[29]	6,461
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC
Fair Value		51,098		39,427		50,770
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Energy—Power
Principal amount	[1],[19],[21],[23],[32]			60,603
Amortized Cost	[1],[21],[23],[32]			43,150
Fair Value	[1],[7],[21],[23],[32]			$ 39,427
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Power
Principal amount	[4],[5],[25],[26],[30]	60,603
Amortized Cost	[4],[5],[25],[30]	54,514
Fair Value	[4],[5],[6],[25],[30]	$ 51,098
Investment, Identifier [Axis]: Swift Worldwide Resources Holdco Limited, Common Equity, Commercial & Professional Services
Number of Shares/Units \| shares	[4],[5],[25],[28],[29],[41]	3,750,000
Amortized Cost	[4],[5],[25],[28],[29],[41]	$ 6,029
Fair Value	[4],[5],[6],[25],[28],[29],[41]	$ 3,131
Investment, Identifier [Axis]: TKC Holdings, Inc., Consumer Staples Distribution & Retail
Variable Rate (percent)	[1],[11],[17]			5.50%
Floor Rate (percent)	[1],[11],[17]			1%
Principal amount	[1],[17],[19]			$ 19,650
Amortized Cost	[1],[17]			18,681
Fair Value	[1],[7],[17]			18,830
Investment, Identifier [Axis]: Tallgrass Energy Partners, LP, Midstream
Rate (percent)	[2],[5],[29]	6%
Principal amount	[5],[26],[29]	$ 19,761
Amortized Cost	[5],[29]	19,676
Fair Value	[5],[6],[29]	18,480
Investment, Identifier [Axis]: Telpico, LLC, Common Equity
Fair Value		$ 0		$ 0		0
Investment, Identifier [Axis]: Telpico, LLC, Common Equity, Energy—Upstream
Number of Shares/Units \| shares	[1],[21],[27],[31],[38]			50
Amortized Cost	[1],[21],[27],[31],[38]			$ 0
Fair Value	[1],[7],[21],[27],[31],[38]			$ 0
Investment, Identifier [Axis]: Telpico, LLC, Common Equity, Upstream
Number of Shares/Units \| shares	[4],[5],[28],[29],[33],[39]	50
Amortized Cost	[4],[5],[28],[29],[33],[39]	$ 0
Fair Value	[4],[5],[6],[28],[29],[33],[39]	$ 0
Investment, Identifier [Axis]: Tenrgys, LLC, Common Equity, Energy—Upstream
Number of Shares/Units \| shares	[1],[21],[27],[31]			50
Amortized Cost	[1],[21],[27],[31]			$ 7,571
Fair Value	[1],[7],[21],[27],[31]			$ 4,418
Investment, Identifier [Axis]: Tenrgys, LLC, Common Equity, Upstream
Number of Shares/Units \| shares	[4],[5],[28],[29],[33]	50
Amortized Cost	[4],[5],[28],[29],[33]	$ 7,571
Fair Value	[4],[5],[6],[28],[29],[33]	$ 6,801
Investment, Identifier [Axis]: Tenrgys, LLC, Energy—Upstream
Variable Rate (percent)	[1],[11],[17],[21]			7.50%
Floor Rate (percent)	[1],[11],[17],[21]			1%
Principal amount	[1],[17],[19],[21]			$ 20,537
Amortized Cost	[1],[17],[21]			20,537
Fair Value	[1],[7],[17],[21]			$ 19,998
Investment, Identifier [Axis]: Tenrgys, LLC, Energy—Upstream \| Maximum
PIK Rate (percent)	[1],[11],[17],[21]			9.50%
Investment, Identifier [Axis]: Tenrgys, LLC, Upstream
Variable Rate (percent)	[2],[4],[5],[29]	7.50%
Floor Rate (percent)	[2],[4],[5],[29]	1%
Principal amount	[4],[5],[26],[29]	$ 20,537
Amortized Cost	[4],[5],[29]	20,537
Fair Value	[4],[5],[6],[29]	$ 20,537
Investment, Identifier [Axis]: Tenrgys, LLC, Upstream \| Maximum
PIK Rate (percent)	[2],[4],[5],[29]	9.50%
Investment, Identifier [Axis]: Traverse Midstream Partners LLC, Midstream
Variable Rate (percent)	[2],[5]	4.25%
Floor Rate (percent)	[2],[5]	1%
Principal amount	[5],[26]	$ 28,436
Amortized Cost	[5]	28,484
Fair Value	[5],[6]	$ 28,418
Investment, Identifier [Axis]: TruGreen, LP, Commercial & Professional Services
Variable Rate (percent)	[1],[11],[17]			4%
Floor Rate (percent)	[1],[11],[17]			0.80%
Principal amount	[1],[17],[19]			$ 19,910
Amortized Cost	[1],[17]			18,614
Fair Value	[1],[7],[17]			19,268
Investment, Identifier [Axis]: U.S. Treasury Bill
Principal amount	[1],[42]			21,000
Amortized Cost	[1],[42]			20,994
Fair Value	[1],[7],[42]			$ 21,000
Investment, Identifier [Axis]: USA Compression Partners, LP, Common Equity, Midstream
Number of Shares/Units \| shares	[5],[25],[28],[29]	84,779
Amortized Cost	[5],[25],[28],[29]	$ 1,617
Fair Value	[5],[6],[25],[28],[29]	$ 1,655
Investment, Identifier [Axis]: USA Compression Partners, LP, Preferred Equity, Energy—Midstream
Rate (percent)	[1],[11],[16],[17],[21],[23]			9.80%
Number of Shares/Units \| shares	[1],[16],[17],[21],[23]			79,336
Amortized Cost	[1],[16],[17],[21],[23]			$ 78,091
Fair Value	[1],[7],[16],[17],[21],[23]			98,333
Investment, Identifier [Axis]: USA Compression Partners, LP, Preferred Equity, Midstream
Rate (percent)	[4],[5],[15],[25]	9.80%
Number of Shares/Units \| shares	[4],[5],[15],[25]	79,336
Amortized Cost	[4],[5],[15],[25]	$ 77,943
Fair Value	[4],[5],[6],[15],[25]	$ 90,479
Investment, Identifier [Axis]: USA Compression Partners, LP, Warrants (Premium), Strike: $19.59, Midstream
Number of Shares/Units \| shares	[4],[5],[25],[28],[29]	1,586,719
Amortized Cost	[4],[5],[25],[28],[29]	$ 714
Fair Value	[4],[5],[6],[25],[28],[29]	$ 5,711
Strike price (in dollars per share) \| $ / shares	[4],[5],[25],[28],[29]	$ 19.59
Investment, Identifier [Axis]: Warren Resources, Inc.
Fair Value		$ 23,584		23,823		23,688
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity
Fair Value		$ 36,982		$ 15,566		$ 25,854
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity, Energy—Upstream
Number of Shares/Units \| shares	[1],[21],[27],[32]			4,415,749
Amortized Cost	[1],[21],[27],[32]			$ 20,754
Fair Value	[1],[7],[21],[27],[32]			$ 15,566
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity, Upstream
Number of Shares/Units \| shares	[4],[5],[28],[29],[30]	4,415,749
Amortized Cost	[4],[5],[28],[29],[30]	$ 20,754
Fair Value	[4],[5],[6],[28],[29],[30]	$ 36,982
Investment, Identifier [Axis]: Warren Resources, Inc., Energy—Upstream
Variable Rate (percent)	[1],[11],[17],[21],[32]			9%
PIK Rate (percent)	[1],[11],[17],[21],[32]			1%
Floor Rate (percent)	[1],[11],[17],[21],[32]			1%
Principal amount	[1],[17],[19],[21],[32]			$ 23,823
Amortized Cost	[1],[17],[21],[32]			23,823
Fair Value	[1],[7],[17],[21],[32]			$ 23,823
Investment, Identifier [Axis]: Warren Resources, Inc., Energy—Upstream \| Maximum
PIK Rate (percent)	[1],[11],[17],[21],[32]			1%
Investment, Identifier [Axis]: Warren Resources, Inc., Upstream
Variable Rate (percent)	[2],[4],[5],[30]	9%
PIK Rate (percent)	[2],[4],[5],[30]	1%
Floor Rate (percent)	[2],[4],[5],[30]	1%
Principal amount	[4],[5],[26],[30]	$ 23,584
Amortized Cost	[4],[5],[30]	23,584
Fair Value	[4],[5],[6],[30]	$ 23,584
Investment, Identifier [Axis]: Warren Resources, Inc., Upstream \| Maximum
PIK Rate (percent)	[2],[4],[5],[30]	1%
Investment, Identifier [Axis]: Wattbridge Inc., Energy—Power
Variable Rate (percent)	[1],[11],[17],[21]			9.85%
Floor Rate (percent)	[1],[11],[17],[21]			1.80%
Principal amount	[1],[17],[19],[21]			$ 42,938
Amortized Cost	[1],[17],[21]			42,938
Fair Value	[1],[7],[17],[21]			$ 41,882
Investment, Identifier [Axis]: Wattbridge Inc., Power
Variable Rate (percent)	[2],[4],[5]	7.85%
Floor Rate (percent)	[2],[4],[5]	1.80%
Principal amount	[4],[5],[26]	$ 42,500
Amortized Cost	[4],[5]	42,500
Fair Value	[4],[5],[6]	$ 41,880

[1]Security may be an obligation of one or more entities affiliated with the named company.[2]Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of December 31, 2022, the three-month London Interbank Offered Rate, or LIBOR, or L, was 4.77% and the Secured Overnight Financing Rate, or SOFR, or S, was 4.59%. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment. Variable rate securities with no floor rate use the respective benchmark rate in all cases.[3]Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.[4]Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).[5]Security may be an obligation of one or more entities affiliated with the named company.[6]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.[7]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.[8]Includes $23,098 held in Allspring Government Money Market Fund with a 7-day yield of 5.3% as of December 31, 2023.[9]Includes the effect of swap contracts.[10]Receive represents that the Company receives payments for any positive net return and makes payments for any negative net return on the underlying reference. Pay represents that the Company receives payments for any negative net return and makes payments for any positive net return on the underlying reference.[11]Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of December 31, 2023, the one-month and three-month Secured Overnight Financing Rate, or SOFR, or S, was 5.35% and 5.33%, respectively, and the Overnight Bank Funding Rate, or OBFR, was 5.32%. SOFR based contracts may include a credit spread adjustment that is charged in addition to the base rate and basis point spread. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment. Variable rate securities with no floor rate use the respective benchmark rate in all cases. Portfolio Company Fair Value at December 31, 2021 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income (3) PIK Income (3) Dividend Income (3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC (4) $ 7,782 $ 654 $ — $ — $ — $ 8,436 $ — $ 654 $ — Allied Wireline Services, LLC 46,339 5,808 — — 11,741 63,888 316 5,808 — MECO IV Holdco, LLC 22,745 455 (23,200) — — — — 455 — Warren Resources, Inc. 23,688 237 (341) — — 23,584 2,620 237 — Sustainable Infrastructure Investments, LLC Sustainable Infrastructure Investments, LLC 50,770 — — — 328 51,098 — — 735 Equity/Other Allied Wireline Services, LLC, Common Equity — — — — 10,463 10,463 — — — Allied Wireline Services, LLC, Warrants — — — — — — — — — MECO IV Holdco, LLC, Class A-1 Units 4,181 — (18,060) 15,899 (2,020) — — — — Warren Resources, Inc., Common Equity 25,854 — — — 11,128 36,982 — — — $ 181,359 $ 7,154 $ (41,601) $ 15,899 $ 31,640 $ 194,451 $ 2,936 $ 7,154 $ 735 _____________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest, PIK and dividend income presented for the year ended December 31, 2022. (4) Security includes a partially unfunded commitment with amortized cost of $2,500 and fair value of $2,500. Portfolio Company Fair Value at December 31, 2022 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2023 Interest Income (3) PIK Income (3) Dividend Income (3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC $ 8,436 $ 138 $ (8,574) $ — $ — $ — $ 256 $ 139 $ — Allied Wireline Services, LLC 63,888 6,389 — — (48,077) 22,200 — 2,910 — Warren Resources, Inc. 23,584 239 — — — 23,823 3,464 179 — Sustainable Infrastructure Investments, LLC Sustainable Infrastructure Investments, LLC 51,098 — (11,364) — (307) 39,427 — — 8,324 Equity/Other Allied Wireline Services, LLC, Common Equity 10,463 — — — (10,463) — — — — Allied Wireline Services, LLC, Warrants — — — — — — — — — Warren Resources, Inc., Common Equity 36,982 — — — (21,416) 15,566 — — — $ 194,451 $ 6,766 $ (19,938) $ — $ (80,263) $ 101,016 $ 3,720 $ 3,228 $ 8,324 _____________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest, PIK and dividend income presented for the year ended December 31, 2023. Portfolio Company Fair Value at December 31, 2022 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2023 Interest Income (3) PIK Income (3) Senior Secured Loans—First Lien Permian Production Holdings, LLC $ 4,767 $ 231 $ — $ — $ (182) $ 4,816 $ 675 $ 97 Equity/Other GWP Midstream Holdco, LLC, Common Equity 5,044 — (3,112) 3,112 (3,383) 1,661 — — Harvest Oil & Gas Corp., Common Equity 810 — (641) — 102 271 — — Limetree Bay Energy, LLC, Class A Units 1,885 246 — (21,704) 19,573 — — — Permian Production Holdings, LLC, Common Equity 11,420 — — — (10,672) 748 — — Ridgeback Resources Inc., Common Equity 41,851 — (35,240) (11,359) 4,748 — — — Telpico, LLC, Common Equity — — — — — — — — $ 65,777 $ 477 $ (38,993) $ (29,951) $ 10,186 $ 7,496 $ 675 $ 97 _____________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest and PIK income presented for the year ended December 31, 2023. Portfolio Company Fair Value at December 31, 2021 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income (3) PIK Income (3) Fee Income (3) Dividend Income (3) Senior Secured Loans—First Lien Limetree Bay Energy, LLC $ 3,166 $ — $ (1,587) $ (12,756) $ 11,177 $ — $ — $ — $ — $ — Permian Production Holdings, LLC 7,889 697 (3,674) 551 (696) 4,767 570 105 — — Senior Secured Bonds Great Western Petroleum, LLC 58,055 96 (55,096) 1,087 (4,142) — 2,649 — 7,268 — Equity/Other Great Western Petroleum, LLC, Common Equity 40,731 — (84,871) 54,081 (9,941) — — — — — GWP Midstream Holdco, LLC, Common Equity — 6,681 — — (1,637) 5,044 — — — — Harvest Oil & Gas Corp., Common Equity 2,836 — (743) — (1,283) 810 — — — — Limetree Bay Energy, LLC, Class A Units 6,046 1,795 — — (5,956) 1,885 — — — — Permian Production Holdings, LLC, Common Equity 8,829 4 — — 2,587 11,420 — — — 1,726 Ridgeback Resources Inc., Common Equity 48,356 — (12,559) 173 5,881 41,851 — — — 3,691 Telpico, LLC, Common Equity — — — — — — — — — — $ 175,908 $ 9,273 $ (158,530) $ 43,136 $ (4,010) $ 65,777 $ 3,219 $ 105 $ 7,268 $ 5,417 _______________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest, PIK, fee and dividend income presented for the year ended December 31, 2022.

Consolidated Schedule of Inve_2

Consolidated Schedule of Investments (Parenthetical) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Derivative [Line Items]
Qualifying assets, percent of total assets		80.80%		77.50%
Unfunded commitment with amortized cost				$ 2,500
Investment company, financial commitment fair value				2,500
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1]	$ 2,047,115
Net realized gain (loss) on investments:		(59,301)		37,383		$ (273,439)
Net change in unrealized appreciation (depreciation) on investments:		(144,904)		82,009		436,095
Fair Value, ending balance		1,523,196	[2],[3]	2,047,115	[1]
Paid-in-kind interest income		14,199		19,925		27,816
Fee income		591		0		0
Non-Controlled/Affiliated
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		65,777		175,908
Gross Additions		477		9,273
Gross Reductions		(38,993)		(158,530)
Net realized gain (loss) on investments:		(29,951)		43,136		(282,893)
Net change in unrealized appreciation (depreciation) on investments:		10,186		(4,010)		142,870
Fair Value, ending balance		7,496		65,777		175,908
Interest Income		675		3,219
Paid-in-kind interest income		97		105		215
Fee income		0		7,268		0
Dividend income		0		5,417		1,574
Controlled/affiliated
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		194,451		181,359
Gross Additions		6,766		7,154
Gross Reductions		(19,938)		(41,601)
Net realized gain (loss) on investments:		0		15,899		0
Net change in unrealized appreciation (depreciation) on investments:		(80,263)		31,640		(11,482)
Fair Value, ending balance		101,016		194,451		181,359
Interest Income		3,720		2,936
Paid-in-kind interest income		3,228		7,154		6,774
Fee income		0		0		9
Dividend income		8,324		735		5,729
Investment, Identifier [Axis]: AI Aqua Merger Sub, Inc., Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[5]	16,625
Investment, Identifier [Axis]: AI Aqua Merger Sub, Inc., Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[5],[6]	3,500
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Energy—Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[8],[9]	23,050
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[12],[13]	23,519
Fair Value, ending balance	[1],[10],[11],[12],[13]			23,519
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[12],[13],[14]	5,545
Fair Value, ending balance	[1],[10],[11],[12],[13],[14]			5,545
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Warrants, Strike: $1.00, Energy—Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[8],[9],[15]	0
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Warrants, Strike: $1.00, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[12],[13],[16],[17],[18]	1,630
Fair Value, ending balance	[1],[10],[11],[12],[13],[16],[17],[18]			1,630
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Equity, Energy—Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15]	1,375
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Equity, Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[16],[17],[18]	1,219
Fair Value, ending balance	[1],[10],[11],[16],[17],[18]			1,219
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Equity , Energy—Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15],[19]	10,159
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Equity, Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[16],[17],[18]	8,321
Fair Value, ending balance	[1],[10],[11],[16],[17],[18]			8,321
Investment, Identifier [Axis]: Acrisure, LLC, Insurance
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	20,251
Investment, Identifier [Axis]: Aethon III BR LLC, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[18]	20,138
Fair Value, ending balance	[1],[10],[11],[18]			20,138
Investment, Identifier [Axis]: Aethon United BR LP, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[18]	40,221
Fair Value, ending balance	[1],[11],[18]			40,221
Investment, Identifier [Axis]: Aimbridge Acquisition Co. Inc., Consumer Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	20,380
Investment, Identifier [Axis]: AirSwift Holdings, Ltd., Common Equity, Commercial & Professional Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[9],[15]	3,413
Investment, Identifier [Axis]: Allegiant Travel Co., Transportation
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[9]	10,385
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		8,436		7,782
Gross Additions		138		654
Gross Reductions		(8,574)		0
Net realized gain (loss) on investments:		0		0
Net change in unrealized appreciation (depreciation) on investments:		0		0
Fair Value, ending balance		0		8,436		7,782
Interest Income		256		0
Paid-in-kind interest income		139		654
Dividend income		0		0
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[18],[20]	8,436
Fair Value, ending balance	[1],[10],[11],[18],[20]			8,436
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[14],[20]	2,500
Fair Value, ending balance	[1],[10],[11],[14],[20]			2,500
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	9,998
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	9,903
Investment, Identifier [Axis]: Allied Wireline Services, LLC
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		63,888		46,339
Gross Additions		6,389		5,808
Gross Reductions		0		0
Net realized gain (loss) on investments:		0		0
Net change in unrealized appreciation (depreciation) on investments:		(48,077)		11,741
Fair Value, ending balance		22,200		63,888		46,339
Interest Income		0		316
Paid-in-kind interest income		2,910		5,808
Dividend income		0		0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		10,463		0
Gross Additions		0		0
Gross Reductions		0		0
Net realized gain (loss) on investments:		0		0
Net change in unrealized appreciation (depreciation) on investments:		(10,463)		10,463
Fair Value, ending balance		0		10,463		0
Interest Income		0		0
Paid-in-kind interest income		0		0
Dividend income		0		0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity, Energy—Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15],[21],[22]	0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity, Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[16],[17],[18],[20],[23]	10,463
Fair Value, ending balance	[1],[10],[11],[16],[17],[18],[20],[23]			10,463
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Energy—Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15],[22],[24]	22,200
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[18],[20]	63,888
Fair Value, ending balance	[1],[10],[11],[18],[20]			63,888
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0		0
Gross Additions		0		0
Gross Reductions		0		0
Net realized gain (loss) on investments:		0		0
Net change in unrealized appreciation (depreciation) on investments:		0		0
Fair Value, ending balance		0		0		0
Interest Income		0		0
Paid-in-kind interest income		0		0
Dividend income		0		0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants, Energy—Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15],[21],[22]	0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants, Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[16],[17],[18],[20],[23]	0
Fair Value, ending balance	[1],[10],[11],[16],[17],[18],[20],[23]			0
Investment, Identifier [Axis]: Allspring Government Money Market Fund - Select Class, Money Market Fund
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3]	23,098
Investment, Identifier [Axis]: American Auto Auction Group, LLC, Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	9,858
Investment, Identifier [Axis]: Archrock Partners, L.P., Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[13],[18]	2,840
Fair Value, ending balance	[1],[11],[13],[18]			2,840
Investment, Identifier [Axis]: Arena Energy, LP, Contingent Value Rights, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15]	571
Investment, Identifier [Axis]: Arena Energy, LP, Contingent Value Rights, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[16],[17],[18]	858
Fair Value, ending balance	[1],[10],[11],[16],[17],[18]			858
Investment, Identifier [Axis]: Aretec Escrow Issuer Inc., Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	7,447
Investment, Identifier [Axis]: Aretec Group, Inc., Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[5]	9,358
Investment, Identifier [Axis]: Ascent Resources Utica Holdings, LLC, Common Equity, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15],[21]	39,545
Investment, Identifier [Axis]: Ascent Resources Utica Holdings, LLC, Common Equity, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[16],[17],[18],[23]	52,340
Fair Value, ending balance	[1],[10],[11],[16],[17],[18],[23]			52,340
Investment, Identifier [Axis]: Auris Luxembourg III S.a r.l, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[9]	20,079
Investment, Identifier [Axis]: Aveanna Healthcare LLC, Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	14,852
Investment, Identifier [Axis]: BCPE Empire Holdings, Inc., Consumer Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	24,998
Investment, Identifier [Axis]: Brazos Delaware II LLC, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	39,137
Fair Value, ending balance	[1],[11]			39,137
Investment, Identifier [Axis]: CCS-CMGC Holdings, Inc., Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	18,222
Investment, Identifier [Axis]: CPM Holdings, Inc., Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	20,092
Investment, Identifier [Axis]: CPV Maryland, LLC, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	14,155
Fair Value, ending balance	[1],[11]			14,155
Investment, Identifier [Axis]: CPV Shore Holdings LLC, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	21,935
Fair Value, ending balance	[1],[11]			21,935
Investment, Identifier [Axis]: Charlotte Buyer, Inc., Health Care Equipment & Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[5]	19,952
Investment, Identifier [Axis]: Cimarron Energy Holdco Inc., Common Equity, Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[16],[17],[18]	0
Fair Value, ending balance	[1],[10],[11],[16],[17],[18]			0
Investment, Identifier [Axis]: Cimarron Energy Holdco Inc., Participation Option, Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[16],[17],[18]	0
Fair Value, ending balance	[1],[10],[11],[16],[17],[18]			0
Investment, Identifier [Axis]: Cimarron Energy Inc., Service & Equipment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[17],[18],[25]	3,713
Fair Value, ending balance	[1],[10],[11],[17],[18],[25]			3,713
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[7]	21,098
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[6],[7]	2,712
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services3
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[6],[7]	1,356
Investment, Identifier [Axis]: Cirque Du Soleil Holding USA Newco, Inc., Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[5]	6,372
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[7]	34,426
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[18]	38,240
Fair Value, ending balance	[1],[10],[11],[18]			38,240
Investment, Identifier [Axis]: Clear Channel Outdoor Holdings, Inc., Media & Entertainment
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[9]	19,829
Investment, Identifier [Axis]: Clydesdale Acquisition Holdings Inc., Financials Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	20,061
Investment, Identifier [Axis]: Compass Power Generation LLC, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	31,384
Fair Value, ending balance	[1],[11]			31,384
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[26],[27]	1,234
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[28],[29]	20,683
Fair Value, ending balance	[1],[10],[11],[28],[29]			20,683
Investment, Identifier [Axis]: Crown SubSea Communications Holding, Inc., Capital Goods 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[5]	4,534
Investment, Identifier [Axis]: Crown SubSea Communications Holding, Inc., Capital Goods 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[5]	5,468
Investment, Identifier [Axis]: EIF Van Hook Holdings, LLC, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	26,075
Fair Value, ending balance	[1],[11]			26,075
Investment, Identifier [Axis]: ERA II Minerals, LLC, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[18]	36,656
Fair Value, ending balance	[1],[10],[11],[18]			36,656
Investment, Identifier [Axis]: Earthstone Energy Holdings, LLC, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[13]	10,920
Fair Value, ending balance	[1],[11],[13]			10,920
Investment, Identifier [Axis]: Endeavor Energy Resources, L.P., Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[18]	23,306
Fair Value, ending balance	[1],[11],[18]			23,306
Investment, Identifier [Axis]: Engineered Machinery Holdings, Inc., Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	19,840
Investment, Identifier [Axis]: FR BR Holdings LLC, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[18]	81,361
Fair Value, ending balance	[1],[10],[11],[18]			81,361
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[7]	17,156
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11]	17,406
Fair Value, ending balance	[1],[10],[11]			17,406
Investment, Identifier [Axis]: First Brands Group, LLC, Automobiles & Components
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	19,781
Investment, Identifier [Axis]: Full House Resorts, Inc., Consumer Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	19,517
Investment, Identifier [Axis]: GIP II Blue Holding LP, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	5,877
Fair Value, ending balance	[1],[11]			5,877
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		5,044		0
Gross Additions		0		6,681
Gross Reductions		(3,112)		0
Net realized gain (loss) on investments:		3,112		0
Net change in unrealized appreciation (depreciation) on investments:		(3,383)		(1,637)
Fair Value, ending balance		1,661		5,044		0
Interest Income		0		0
Paid-in-kind interest income		0		0
Fee income				0
Dividend income				0
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15],[21],[30]	1,661
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[16],[17],[18],[23],[31]	5,044
Fair Value, ending balance	[1],[10],[11],[16],[17],[18],[23],[31]			5,044
Investment, Identifier [Axis]: GasLog Ltd., Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7]	13,510
Investment, Identifier [Axis]: GasLog Ltd., Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[13]	14,010
Fair Value, ending balance	[1],[10],[11],[13]			14,010
Investment, Identifier [Axis]: Generation Bridge LLC, Power 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	7,385
Fair Value, ending balance	[1],[11]			7,385
Investment, Identifier [Axis]: Generation Bridge LLC, Power 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	162
Fair Value, ending balance	[1],[11]			162
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Commercial & Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15],[19]	0
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Commercial & Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15],[19],[24]	10,357
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Professional Services 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[16],[17],[18]	0
Fair Value, ending balance	[1],[10],[11],[16],[17],[18]			0
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Professional Services 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[16],[17],[18],[25]	9,377
Fair Value, ending balance	[1],[10],[11],[16],[17],[18],[25]			9,377
Investment, Identifier [Axis]: Gold Rush Amusements, Inc., Consumer Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[7]	30,059
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[7]	14,379
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11]	14,819
Fair Value, ending balance	[1],[10],[11]			14,819
Investment, Identifier [Axis]: Great Western Petroleum, LLC
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0		58,055
Gross Additions				96
Gross Reductions				(55,096)
Net realized gain (loss) on investments:				1,087
Net change in unrealized appreciation (depreciation) on investments:				(4,142)
Fair Value, ending balance				0		58,055
Interest Income				2,649
Paid-in-kind interest income				0
Fee income				7,268
Dividend income				0
Investment, Identifier [Axis]: Great Western Petroleum, LLC, Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0		40,731
Gross Additions				0
Gross Reductions				(84,871)
Net realized gain (loss) on investments:				54,081
Net change in unrealized appreciation (depreciation) on investments:				(9,941)
Fair Value, ending balance				0		40,731
Interest Income				0
Paid-in-kind interest income				0
Fee income				0
Dividend income				0
Investment, Identifier [Axis]: Guardian US Holdco, LLC, Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	20,008
Investment, Identifier [Axis]: Guitar Center, Inc., Consumer Discretionary Distribution & Retail
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	17,473
Investment, Identifier [Axis]: Hamilton Intermediate Holdings, LLC, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11]	31,007
Fair Value, ending balance	[1],[10],[11]			31,007
Investment, Identifier [Axis]: Hammerhead Resources Inc., Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[13],[18]	35,118
Fair Value, ending balance	[1],[10],[11],[13],[18]			35,118
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		810		2,836
Gross Additions		0		0
Gross Reductions		(641)		(743)
Net realized gain (loss) on investments:		0		0
Net change in unrealized appreciation (depreciation) on investments:		102		(1,283)
Fair Value, ending balance		271		810		2,836
Interest Income		0		0
Paid-in-kind interest income		0		0
Fee income				0
Dividend income				0
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[15],[30]	271
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[16],[17],[18],[31]	810
Fair Value, ending balance	[1],[11],[16],[17],[18],[31]			810
Investment, Identifier [Axis]: Knowlton Development Corporation Inc., Household & Personal Products
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	20,858
Investment, Identifier [Axis]: LABL, Inc., Commerical & Professional Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	19,106
Investment, Identifier [Axis]: Learning Care Group No. 2 Inc., Consumer Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	20,100
Investment, Identifier [Axis]: Limetree Bay Energy, LLC
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0		3,166
Gross Additions				0
Gross Reductions				(1,587)
Net realized gain (loss) on investments:				(12,756)
Net change in unrealized appreciation (depreciation) on investments:				11,177
Fair Value, ending balance				0		3,166
Interest Income				0
Paid-in-kind interest income				0
Fee income				0
Dividend income				0
Investment, Identifier [Axis]: Limetree Bay Energy, LLC, Class A Units
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		1,885		6,046
Gross Additions		246		1,795
Gross Reductions		0		0
Net realized gain (loss) on investments:		(21,704)		0
Net change in unrealized appreciation (depreciation) on investments:		19,573		(5,956)
Fair Value, ending balance		0		1,885		6,046
Interest Income		0		0
Paid-in-kind interest income		0		0
Fee income				0
Dividend income				0
Investment, Identifier [Axis]: Limetree Bay Energy, LLC, Class A Units, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[16],[17],[18],[31]	1,885
Fair Value, ending balance	[1],[10],[11],[16],[17],[18],[31]			1,885
Investment, Identifier [Axis]: MB Precision Investment Holdings LLC, Class A-2 Units, Industrials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[16],[17],[18],[23]	0
Fair Value, ending balance	[1],[10],[11],[16],[17],[18],[23]			0
Investment, Identifier [Axis]: MECO IV Holdco, LLC
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0		22,745
Gross Additions				455
Gross Reductions				(23,200)
Net realized gain (loss) on investments:				0
Net change in unrealized appreciation (depreciation) on investments:				0
Fair Value, ending balance				0		22,745
Interest Income				0
Paid-in-kind interest income				455
Dividend income				0
Investment, Identifier [Axis]: MECO IV Holdco, LLC, Class A-1 Units
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0		4,181
Gross Additions				0
Gross Reductions				(18,060)
Net realized gain (loss) on investments:				15,899
Net change in unrealized appreciation (depreciation) on investments:				(2,020)
Fair Value, ending balance				0		4,181
Interest Income				0
Paid-in-kind interest income				0
Dividend income				0
Investment, Identifier [Axis]: Maverick Natural Resources, LLC, Common Equity, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15],[21]	164,040
Investment, Identifier [Axis]: Maverick Natural Resources, LLC, Common Equity, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[16],[18],[23]	312,372
Fair Value, ending balance	[1],[10],[11],[16],[18],[23]			312,372
Investment, Identifier [Axis]: Mavis Tire Express Services TopCo, L.P., Consumer Discretionary Distribution & Retail
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	19,955
Investment, Identifier [Axis]: Medallion Midland Acquisition LP, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	7,862
Fair Value, ending balance	[1],[11]			7,862
Investment, Identifier [Axis]: Moss Creek Resources, LLC, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[18]	10,561
Fair Value, ending balance	[1],[11],[18]			10,561
Investment, Identifier [Axis]: NGL Energy Partners, LP, Preferred Equity, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[7],[9],[15],[19],[24]	141,141
Investment, Identifier [Axis]: NGL Energy Partners, LP, Preferred Equity, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[13],[16],[17],[18],[25]	125,000
Fair Value, ending balance	[1],[10],[11],[13],[16],[17],[18],[25]			125,000
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $13.56, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[9],[15]	621
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $13.56, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[13],[17],[18]	3
Fair Value, ending balance	[1],[10],[11],[13],[17],[18]			3
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $14.54, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[9],[15]	2,682
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $14.54, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[13],[16],[17],[18]	10
Fair Value, ending balance	[1],[10],[11],[13],[16],[17],[18]			10
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $16.27, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[9],[15]	735
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $16.27, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[13],[16],[17],[18]	2
Fair Value, ending balance	[1],[10],[11],[13],[16],[17],[18]			2
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $17.45, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[9],[15]	3,083
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $17.45, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[13],[16],[17],[18]	8
Fair Value, ending balance	[1],[10],[11],[13],[16],[17],[18]			8
Investment, Identifier [Axis]: NRG Energy, Inc., Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[13]	14,401
Fair Value, ending balance	[1],[11],[13]			14,401
Investment, Identifier [Axis]: Navios Logistics Finance, Inc., Transportation
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[9]	19,772
Investment, Identifier [Axis]: Nephron Pharmaceuticals Corp., Pharmaceuticals, Biotechnology & Life Sciences
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7]	19,300
Investment, Identifier [Axis]: NuStar, Preferred Equity, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[13],[16],[18]	83,590
Fair Value, ending balance	[1],[10],[11],[13],[16],[18]			83,590
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11]	18,847
Fair Value, ending balance	[1],[10],[11]			18,847
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[14]	11,455
Fair Value, ending balance	[1],[10],[11],[14]			11,455
Investment, Identifier [Axis]: Oryx Midstream Services Permian Basin LLC, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[18]	32,026
Fair Value, ending balance	[1],[11],[18]			32,026
Investment, Identifier [Axis]: Parkway Generation LLC, Power 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	5,700
Fair Value, ending balance	[1],[11]			5,700
Investment, Identifier [Axis]: Parkway Generation LLC, Power 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	43,285
Fair Value, ending balance	[1],[11]			43,285
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[18]	13,394
Fair Value, ending balance	[1],[10],[11],[18]			13,394
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[14]	1,488
Fair Value, ending balance	[1],[10],[11],[14]			1,488
Investment, Identifier [Axis]: Permian Production Holdings, LLC
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		4,767		7,889
Gross Additions		231		697
Gross Reductions		0		(3,674)
Net realized gain (loss) on investments:		0		551
Net change in unrealized appreciation (depreciation) on investments:		(182)		(696)
Fair Value, ending balance		4,816		4,767		7,889
Interest Income		675		570
Paid-in-kind interest income		97		105
Fee income				0
Dividend income				0
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		11,420		8,829
Gross Additions		0		4
Gross Reductions		0		0
Net realized gain (loss) on investments:		0		0
Net change in unrealized appreciation (depreciation) on investments:		(10,672)		2,587
Fair Value, ending balance		748		11,420		8,829
Interest Income		0		0
Paid-in-kind interest income		0		0
Fee income				0
Dividend income				1,726
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15],[21],[30]	748
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[18],[23],[31]	11,420
Fair Value, ending balance	[1],[10],[11],[18],[23],[31]			11,420
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[30]	4,816
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[18],[31]	4,767
Fair Value, ending balance	[1],[10],[11],[18],[31]			4,767
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	25,703
Fair Value, ending balance	[1],[11]			25,703
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[18]	4,473
Fair Value, ending balance	[1],[11],[18]			4,473
Investment, Identifier [Axis]: Phoenix Guarantor Inc., Financial Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[5]	19,951
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11]	9,310
Fair Value, ending balance	[1],[10],[11]			9,310
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[14]	2,461
Fair Value, ending balance	[1],[10],[11],[14]			2,461
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15],[24]	7,473
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15],[24]	0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Energy—Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[6],[7]	0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[14]	0
Fair Value, ending balance	[1],[10],[11],[14]			0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[18]	9,997
Fair Value, ending balance	[1],[10],[11],[18]			9,997
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[18]	0
Fair Value, ending balance	[1],[10],[11],[18]			0
Investment, Identifier [Axis]: Potomac Energy Center, LLC, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11]	58,443
Fair Value, ending balance	[1],[10],[11]			58,443
Investment, Identifier [Axis]: Pretium PKG Holdings, Inc., Materials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	29,591
Investment, Identifier [Axis]: Pro Mach Group, Inc., Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	20,007
Investment, Identifier [Axis]: Proampac PG Borrower LLC, Materials
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	20,062
Investment, Identifier [Axis]: Ranger Oil Corp., Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[13]	29,678
Fair Value, ending balance	[1],[11],[13]			29,678
Investment, Identifier [Axis]: Realtruck Group, Inc., Automobiles & Components
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[5]	19,740
Investment, Identifier [Axis]: Ridgeback Resources Inc., Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		41,851		48,356
Gross Additions		0		0
Gross Reductions		(35,240)		(12,559)
Net realized gain (loss) on investments:		(11,359)		173
Net change in unrealized appreciation (depreciation) on investments:		4,748		5,881
Fair Value, ending balance		0		41,851		48,356
Interest Income		0		0
Paid-in-kind interest income		0		0
Fee income				0
Dividend income				3,691
Investment, Identifier [Axis]: Ridgeback Resources Inc., Common Equity, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[13],[18],[31],[32]	41,851
Fair Value, ending balance	[1],[10],[11],[13],[18],[31],[32]			41,851
Investment, Identifier [Axis]: Ryan, LLC, Commerical & Professional Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[5]	9,890
Investment, Identifier [Axis]: Ryan, LLC, Commerical & Professional Services1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[5],[6]	1,041
Investment, Identifier [Axis]: SRS Distribution Inc., Capital Goods
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[5]	19,982
Investment, Identifier [Axis]: ST EIP Holdings Inc., Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[7]	9,874
Investment, Identifier [Axis]: ST EIP Holdings Inc., Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11]	10,074
Fair Value, ending balance	[1],[10],[11]			10,074
Investment, Identifier [Axis]: Segreto Power Holdings, LLC, Preferred Equity, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[16],[17],[18],[23],[25]	83,647
Fair Value, ending balance	[1],[10],[11],[16],[17],[18],[23],[25]			83,647
Investment, Identifier [Axis]: SilverBow Resources, Inc., Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[13],[18]	14,322
Fair Value, ending balance	[1],[10],[11],[13],[18]			14,322
Investment, Identifier [Axis]: Sitio Royalties Operating Partnership, LP, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[13],[18]	19,256
Fair Value, ending balance	[1],[10],[11],[13],[18]			19,256
Investment, Identifier [Axis]: Suburban Propane Partners LP, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[13],[18]	6,461
Fair Value, ending balance	[1],[11],[13],[18]			6,461
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		51,098		50,770
Gross Additions		0		0
Gross Reductions		(11,364)		0
Net realized gain (loss) on investments:		0		0
Net change in unrealized appreciation (depreciation) on investments:		(307)		328
Fair Value, ending balance		39,427		51,098		50,770
Interest Income		0		0
Paid-in-kind interest income		0		0
Dividend income		8,324		735
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Energy—Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[9],[22]	39,427
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[13],[20]	51,098
Fair Value, ending balance	[1],[10],[11],[13],[20]			51,098
Investment, Identifier [Axis]: Swift Worldwide Resources Holdco Limited, Common Equity, Commercial & Professional Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[13],[17],[18],[33]	3,131
Fair Value, ending balance	[1],[10],[11],[13],[17],[18],[33]			3,131
Investment, Identifier [Axis]: TKC Holdings, Inc., Consumer Staples Distribution & Retail
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	18,830
Investment, Identifier [Axis]: Tallgrass Energy Partners, LP, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[18]	18,480
Fair Value, ending balance	[1],[11],[18]			18,480
Investment, Identifier [Axis]: Telpico, LLC, Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		0		0
Gross Additions		0		0
Gross Reductions		0		0
Net realized gain (loss) on investments:		0		0
Net change in unrealized appreciation (depreciation) on investments:		0		0
Fair Value, ending balance		0		0		0
Interest Income		0		0
Paid-in-kind interest income		0		0
Fee income				0
Dividend income				0
Investment, Identifier [Axis]: Telpico, LLC, Common Equity, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15],[21],[30]	0
Investment, Identifier [Axis]: Telpico, LLC, Common Equity, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[17],[18],[23],[31]	0
Fair Value, ending balance	[1],[10],[11],[17],[18],[23],[31]			0
Investment, Identifier [Axis]: Tenrgys, LLC, Common Equity, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15],[21]	4,418
Investment, Identifier [Axis]: Tenrgys, LLC, Common Equity, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[17],[18],[23]	6,801
Fair Value, ending balance	[1],[10],[11],[17],[18],[23]			6,801
Investment, Identifier [Axis]: Tenrgys, LLC, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[7]	19,998
Investment, Identifier [Axis]: Tenrgys, LLC, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[18]	20,537
Fair Value, ending balance	[1],[10],[11],[18]			20,537
Investment, Identifier [Axis]: Traverse Midstream Partners LLC, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11]	28,418
Fair Value, ending balance	[1],[11]			28,418
Investment, Identifier [Axis]: TruGreen, LP, Commercial & Professional Services
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4]	19,268
Investment, Identifier [Axis]: U.S. Treasury Bill
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[34]	21,000
Investment, Identifier [Axis]: USA Compression Partners, LP, Common Equity, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[11],[13],[17],[18]	1,655
Fair Value, ending balance	[1],[11],[13],[17],[18]			1,655
Investment, Identifier [Axis]: USA Compression Partners, LP, Preferred Equity, Energy—Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[7],[9],[19]	98,333
Investment, Identifier [Axis]: USA Compression Partners, LP, Preferred Equity, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[13],[16]	90,479
Fair Value, ending balance	[1],[10],[11],[13],[16]			90,479
Investment, Identifier [Axis]: USA Compression Partners, LP, Warrants (Premium), Strike: $19.59, Midstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[13],[17],[18]	5,711
Fair Value, ending balance	[1],[10],[11],[13],[17],[18]			5,711
Investment, Identifier [Axis]: Warren Resources, Inc.
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		23,584		23,688
Gross Additions		239		237
Gross Reductions		0		(341)
Net realized gain (loss) on investments:		0		0
Net change in unrealized appreciation (depreciation) on investments:		0		0
Fair Value, ending balance		23,823		23,584		23,688
Interest Income		3,464		2,620
Paid-in-kind interest income		179		237
Dividend income		0		0
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance		36,982		25,854
Gross Additions		0		0
Gross Reductions		0		0
Net realized gain (loss) on investments:		0		0
Net change in unrealized appreciation (depreciation) on investments:		(21,416)		11,128
Fair Value, ending balance		15,566		36,982		$ 25,854
Interest Income		0		0
Paid-in-kind interest income		0		0
Dividend income		0		0
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity, Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[7],[15],[22]	15,566
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity, Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[17],[18],[20]	36,982
Fair Value, ending balance	[1],[10],[11],[17],[18],[20]			36,982
Investment, Identifier [Axis]: Warren Resources, Inc., Energy—Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[7],[22]	23,823
Investment, Identifier [Axis]: Warren Resources, Inc., Upstream
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11],[20]	23,584
Fair Value, ending balance	[1],[10],[11],[20]			23,584
Investment, Identifier [Axis]: Wattbridge Inc., Energy—Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, ending balance	[2],[3],[4],[7]	41,882
Investment, Identifier [Axis]: Wattbridge Inc., Power
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Fair Value, beginning balance	[1],[10],[11]	$ 41,880
Fair Value, ending balance	[1],[10],[11]			$ 41,880

[1]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.[2]Security may be an obligation of one or more entities affiliated with the named company.[3]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.[4]Security or portion thereof held within FSSL Finance BB AssetCo LLC, a wholly-owned subsidiary of the Company, and is pledged as collateral supporting the obligations outstanding under the repurchase facility with Barclays Bank PLC (see Note 9).[5]Security or portion thereof unsettled as of December 31, 2023.[6]Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.[7]Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).[8]Security or portion thereof held within FS Power Investments II, LLC, a wholly-owned subsidiary of the Company.[9]The investment is not a qualifying asset under the Investment Company Act of 1940, as amended, or the 1940 Act. A business development company may not acquire any asset other than a qualifying asset, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the business development company’s total assets. As of December 31, 2023, 80.8% of the Company’s total assets represented qualifying assets.[10]Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).[11]Security may be an obligation of one or more entities affiliated with the named company.[12]Security or portion thereof held within FS Power Investments II, LLC, a wholly-owned subsidiary of the Company.[13]The investment is not a qualifying asset under the Investment Company Act of 1940, as amended, or the 1940 Act. A business development company may not acquire any asset other than a qualifying asset, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the business development company’s total assets. As of December 31, 2022, 77.5% of the Company’s total assets represented qualifying assets.[14]Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.[15]Security is non-income producing.[16]Listed investments may be treated as debt for U.S. generally accepted accounting principles, or GAAP, or tax purposes.[17]Security is non-income producing.[18]Security or portion thereof is pledged as collateral supporting the amounts outstanding under the Senior Secured Notes with JPMorgan Chase Bank, N.A. (see Note 9).[19]Listed investments may be treated as debt for U.S. generally accepted accounting principles, or GAAP, or tax purposes.[20]Under the 1940 Act, the Company generally is deemed to “control” a portfolio company if it owns more than 25% of the portfolio company’s voting securities or it has the power to exercise control over the management or policies of such portfolio company. As of December 31, 2022, the Company held investments in portfolio companies of which it is deemed to be an “affiliated person” of and deemed to “control.” The following table presents certain information with respect to investments in portfolio companies of which the Company was deemed to be an affiliated person and deemed to control as of December 31, 2022: Portfolio Company Fair Value at December 31, 2021 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income (3) PIK Income (3) Dividend Income (3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC (4) $ 7,782 $ 654 $ — $ — $ — $ 8,436 $ — $ 654 $ — Allied Wireline Services, LLC 46,339 5,808 — — 11,741 63,888 316 5,808 — MECO IV Holdco, LLC 22,745 455 (23,200) — — — — 455 — Warren Resources, Inc. 23,688 237 (341) — — 23,584 2,620 237 — Sustainable Infrastructure Investments, LLC Sustainable Infrastructure Investments, LLC 50,770 — — — 328 51,098 — — 735 Equity/Other Allied Wireline Services, LLC, Common Equity — — — — 10,463 10,463 — — — Allied Wireline Services, LLC, Warrants — — — — — — — — — MECO IV Holdco, LLC, Class A-1 Units 4,181 — (18,060) 15,899 (2,020) — — — — Warren Resources, Inc., Common Equity 25,854 — — — 11,128 36,982 — — — $ 181,359 $ 7,154 $ (41,601) $ 15,899 $ 31,640 $ 194,451 $ 2,936 $ 7,154 $ 735 _____________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest, PIK and dividend income presented for the year ended December 31, 2022. (4) Security includes a partially unfunded commitment with amortized cost of $2,500 and fair value of $2,500. Portfolio Company Fair Value at December 31, 2022 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2023 Interest Income (3) PIK Income (3) Dividend Income (3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC $ 8,436 $ 138 $ (8,574) $ — $ — $ — $ 256 $ 139 $ — Allied Wireline Services, LLC 63,888 6,389 — — (48,077) 22,200 — 2,910 — Warren Resources, Inc. 23,584 239 — — — 23,823 3,464 179 — Sustainable Infrastructure Investments, LLC Sustainable Infrastructure Investments, LLC 51,098 — (11,364) — (307) 39,427 — — 8,324 Equity/Other Allied Wireline Services, LLC, Common Equity 10,463 — — — (10,463) — — — — Allied Wireline Services, LLC, Warrants — — — — — — — — — Warren Resources, Inc., Common Equity 36,982 — — — (21,416) 15,566 — — — $ 194,451 $ 6,766 $ (19,938) $ — $ (80,263) $ 101,016 $ 3,720 $ 3,228 $ 8,324 _____________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest, PIK and dividend income presented for the year ended December 31, 2023. Portfolio Company Fair Value at December 31, 2022 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2023 Interest Income (3) PIK Income (3) Senior Secured Loans—First Lien Permian Production Holdings, LLC $ 4,767 $ 231 $ — $ — $ (182) $ 4,816 $ 675 $ 97 Equity/Other GWP Midstream Holdco, LLC, Common Equity 5,044 — (3,112) 3,112 (3,383) 1,661 — — Harvest Oil & Gas Corp., Common Equity 810 — (641) — 102 271 — — Limetree Bay Energy, LLC, Class A Units 1,885 246 — (21,704) 19,573 — — — Permian Production Holdings, LLC, Common Equity 11,420 — — — (10,672) 748 — — Ridgeback Resources Inc., Common Equity 41,851 — (35,240) (11,359) 4,748 — — — Telpico, LLC, Common Equity — — — — — — — — $ 65,777 $ 477 $ (38,993) $ (29,951) $ 10,186 $ 7,496 $ 675 $ 97 _____________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest and PIK income presented for the year ended December 31, 2023. Portfolio Company Fair Value at December 31, 2021 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income (3) PIK Income (3) Fee Income (3) Dividend Income (3) Senior Secured Loans—First Lien Limetree Bay Energy, LLC $ 3,166 $ — $ (1,587) $ (12,756) $ 11,177 $ — $ — $ — $ — $ — Permian Production Holdings, LLC 7,889 697 (3,674) 551 (696) 4,767 570 105 — — Senior Secured Bonds Great Western Petroleum, LLC 58,055 96 (55,096) 1,087 (4,142) — 2,649 — 7,268 — Equity/Other Great Western Petroleum, LLC, Common Equity 40,731 — (84,871) 54,081 (9,941) — — — — — GWP Midstream Holdco, LLC, Common Equity — 6,681 — — (1,637) 5,044 — — — — Harvest Oil & Gas Corp., Common Equity 2,836 — (743) — (1,283) 810 — — — — Limetree Bay Energy, LLC, Class A Units 6,046 1,795 — — (5,956) 1,885 — — — — Permian Production Holdings, LLC, Common Equity 8,829 4 — — 2,587 11,420 — — — 1,726 Ridgeback Resources Inc., Common Equity 48,356 — (12,559) 173 5,881 41,851 — — — 3,691 Telpico, LLC, Common Equity — — — — — — — — — — $ 175,908 $ 9,273 $ (158,530) $ 43,136 $ (4,010) $ 65,777 $ 3,219 $ 105 $ 7,268 $ 5,417 _______________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest, PIK, fee and dividend income presented for the year ended December 31, 2022.

Principal Business and Organiza

Principal Business and Organization	12 Months Ended
Principal Business and Organization	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principal Business and Organization	Principal Business and Organization FS Specialty Lending Fund, or the Company, was formed as a Delaware statutory trust under the Delaware Statutory Trust Act on September 16, 2010 and formally commenced investment operations on July 18, 2011. Prior to September 29, 2023, the Company’s name was FS Energy and Power Fund . The Company is an externally managed, non-diversified, closed-end management investment company that has elected to be regulated as a business development company, or BDC, under the Investment Company Act of 1940, as amended, or the 1940 Act. In addition, the Company has elected to be treated for U.S. federal income tax purposes, and intends to qualify annually, as a regulated investment company, or RIC, as defined under Subchapter M of the Internal Revenue Code of 1986, as amended, or the Code. As of December 31, 2023, the Company has various wholly-owned financing subsidiaries, including special-purpose financing subsidiaries and subsidiaries through which it holds or expects to hold interests in certain portfolio companies. The audited consolidated financial statements include both the Company’s accounts and the accounts of its wholly-owned subsidiaries as of December 31, 2023. All significant intercompany transactions have been eliminated in consolidation. Certain of the Company’s consolidated subsidiaries are subject to U.S. federal and state income taxes. On May 15, 2023, the Company announced that its board of trustees approved the Company’s transition from an investment policy of investing primarily in energy companies to a diversified credit investment policy of investing across private and public credit in a broader set of industries, sectors and sub-sectors. The Company notified its shareholders of the new policy, which became effective on September 29, 2023. The Company’s current investment objectives are to generate current income and, to a lesser extent, long-term capital appreciation by investing primarily in private and public credit in a broad set of industries, sectors and sub-sectors. The Company’s current investment policy is to invest primarily in a portfolio of secured and unsecured floating and fixed rate loans, bonds and other types of credit instruments, which, under normal circumstances, will represent at least 80% of the Company’s total assets. Prior to September 29, 2023, the Company’s investment objectives were to generate current income and long-term capital appreciation by investing primarily in privately-held U.S. companies in the energy and power industry. Prior to September 29, 2023, the Company’s investment policy was to invest, under normal circumstances, at least 80% of its total assets in securities of energy and power related, or Energy, companies. The Company considers Energy companies to be those companies that engage in the exploration, development, production, gathering, transportation, processing, storage, refining, distribution, mining, generation or marketing of natural gas, natural gas liquids, crude oil, refined products, coal or power, including those companies that provide equipment or services to companies engaged in any of the foregoing. The Company commenced transitioning the Company’s portfolio holdings away from Energy investments in May 2023, while remaining in compliance with the Company’s then-current investment policy. The Company’s allocation to Energy investments is expected to decline over time through the natural course of maturities, repayments and sales activity and by growing the total size of the portfolio through leverage facilities. The pace of the portfolio rotation is dependent upon a number of factors, including the turnover of concentrated illiquid Energy investments, performance of underlying portfolio companies, high yield and energy market conditions, the Company’s access to borrowings and the amount and pace of the payment of enhanced distributions to shareholders, among others. The Company is managed by FS/EIG Advisor, LLC, or FS/EIG Advisor, pursuant to an investment advisory and administrative services agreement, dated as of April 9, 2018, or the FS/EIG investment advisory agreement. FS/EIG Advisor oversees the management of the Company’s operations and is responsible for making investment decisions with respect to the Company’s portfolio. FS/EIG Advisor is jointly operated by an affiliate of Franklin Square Holdings, L.P. (which does business as FS Investments) and EIG Asset Management, LLC, or EIG.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
Summary of Significant Accounting Policies	Dec. 31, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation: The accompanying audited consolidated financial statements of the Company have been prepared in accordance with U.S. generally accepted accounting principles, or GAAP. The Company is considered an investment company under GAAP and follows the accounting and reporting guidance applicable to investment companies under Accounting Standards Codification Topic 946, Financial Services—Investment Companies . The Company has evaluated the impact of subsequent events through the date the consolidated financial statements were issued and filed with the Securities and Exchange Commission, or the SEC. Use of Estimates: The preparation of the audited consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Many of the amounts have been rounded, and all amounts are in thousands, except share and per share amounts. Cash and Cash Equivalents: The Company considers all highly liquid investments with original maturities of three months or less to be cash equivalents. The Company may invest its cash in a money market fund, which is stated at fair value. The Company's cash and cash equivalents are maintained with high credit quality financial institutions, which are members of the Federal Deposit Insurance Corporation. Valuation of Portfolio Investments: The Company’s board of trustees is responsible for overseeing the valuation of the Company’s portfolio investments at fair value as determined in good faith pursuant to FS/EIG Advisor’s valuation policy. As permitted by Rule 2a-5 of the 1940 Act, the Company’s board of trustees has designated FS/EIG Advisor as the Company’s valuation designee, with day-to-day responsibility for implementing the portfolio valuation process set forth in FS/EIG Advisor’s valuation policy. Accounting Standards Codification Topic 820, Fair Value Measurements and Disclosure , or ASC Topic 820, issued by the FASB clarifies the definition of fair value and requires companies to expand their disclosure about the use of fair value to measure assets and liabilities in interim and annual periods subsequent to initial recognition. ASC Topic 820 defines fair value as the price that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC Topic 820 also establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets for identical securities; Level 2, which includes inputs such as quoted prices for similar securities in active markets and quoted prices for identical securities where there is little or no activity in the market; and Level 3, defined as unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions. FS/EIG Advisor determines the fair value of the Company’s investment portfolio each quarter. Securities that are publicly-traded with readily available market prices will be valued at the reported closing price on the valuation date. Securities that are not publicly-traded with readily available market prices will be valued at fair value as determined in good faith by FS/EIG Advisor. In connection with that determination, FS/EIG Advisor will prepare portfolio company valuations which are based on relevant inputs, including, but not limited to, indicative dealer quotes, values of like securities, recent portfolio company financial statements and forecasts, and valuations prepared by independent third-party pricing and valuation services. With respect to investments for which market quotations are not readily available, a multi-step valuation process is undertaken each quarter, as described below: • the quarterly fair valuation process begins with FS/EIG Advisor facilitating the delivery of updated quarterly financial and other information relating to each investment to an independent third-party pricing or valuation service; • the independent third-party pricing or valuation service then reviews and analyzes the information, along with relevant market and economic data, and determines proposed valuations for each portfolio company or investment according to the valuation methodologies in FS/EIG Advisor’s valuation policy and communicates the information to FS/EIG Advisor in the form of a valuation range for Level 2 and Level 3 assets; • FS/EIG Advisor then reviews the preliminary valuation information for each portfolio company or investment and provides feedback about the accuracy, completeness and timeliness of the valuation-related inputs considered by the independent third-party pricing or valuation service and any suggested revisions thereto prior to the independent third-party pricing or valuation service finalizing its valuation range; • FS/EIG Advisor then provides the valuation committee with its valuation determinations and valuation-related information for each portfolio company or investment, along with any applicable supporting materials; and other information that is relevant to the fair valuation process; • the valuation committee meets with FS/EIG Advisor to receive the relevant quarterly reporting from FS/EIG Advisor and to discuss any questions from the valuation committee in connection with the valuation committee’s role in overseeing the fair valuation process; and • following the completion of its fair value oversight activities, the valuation committee (with the assistance of FS/EIG Advisor) provides the Company's board of trustees with a report regarding the quarterly valuation process. Determination of fair value involves subjective judgments and estimates. Accordingly, the notes to the Company's consolidated financial statements refer to the uncertainty with respect to the possible effect of such valuations and any change in such valuations on the Company's consolidated financial statements. In making its determination of fair value, FS/EIG Advisor may use any independent third-party pricing or valuation services for which it has performed the appropriate level of due diligence. However, FS/EIG Advisor is not required to determine fair value in accordance with the valuation provided by any single source, and may use any relevant data, including information sourced by FS/EIG Advisor or provided by any independent third-party pricing or valuation service that FS/EIG Advisor deems to be reliable in determining fair value under the circumstances. Below is a description of factors that FS/EIG Advisor and any independent third-party valuation services may consider when determining the fair value of the Company's investments. The valuation methods utilized for each portfolio company may vary depending on industry and company-specific considerations. Typically, the first step is to make an assessment as to the enterprise value of the portfolio company’s business in order to establish whether the portfolio company’s enterprise value is greater than the amount of its debt as of the valuation date. This analysis helps to determine a risk profile for the applicable portfolio company and its related investments, and the appropriate valuation methodology to utilize as part of the security valuation analysis. The enterprise valuation may be determined using a market or income approach. Valuation of fixed income investments, such as loans and debt securities, depends upon a number of factors, including prevailing interest rates for like securities, expected volatility in future interest rates, call features, put features and other relevant terms of the debt. For investments without readily available market prices, FS/EIG Advisor may incorporate these factors into discounted cash flow models to arrive at fair value. Various methods may be used to determine the appropriate discount rate in a discounted cash flow model. Other factors that may be considered include the borrower’s ability to adequately service its debt, the fair market value of the borrower in relation to the face amount of its outstanding debt and the quality of collateral securing the debt investments. For convertible debt securities, fair value generally approximates the fair value of the debt plus the fair value of an option to purchase the underlying security (i.e., the security into which the debt may convert) at the conversion price. To value such an option, a standard option pricing model may be used. The Company's equity interests in portfolio companies for which there is no liquid public market are valued at fair value. Generally, the value of the Company's equity interests in public companies for which market quotations are readily available is based upon the most recent closing public market price. When the Company receives warrants or other equity securities at nominal or no additional cost in connection with an investment in a debt security, the cost basis in the investment will be allocated between the debt securities and any such warrants or other equity securities received at the time of origination. FS/EIG Advisor subsequently values these warrants or other equity securities received at their fair value. Swap contracts typically are valued at their daily prices obtained from an independent third party. The aggregate settlement values and notional amounts of the swap contracts are not recorded in the consolidated financial statements. Fluctuations in the value of the swap contracts are recorded in the consolidated balance sheets as gross assets and gross liabilities and in the statements of operations as unrealized appreciation (depreciation) until closed, when they are recorded as net realized gain (loss). Revenue Recognition: Security transactions are accounted for on the trade date. The Company records interest income on an accrual basis to the extent that it expects to collect such amounts. The Company records dividend income on the ex-dividend date. Distributions received from limited liability company, or LLC, and limited partnership, or LP, investments are evaluated to determine if the distribution should be recorded as dividend income or a return of capital. The Company does not accrue as a receivable interest or dividends on loans and securities if it has reason to doubt its ability to collect such income. The Company's policy is to place investments on non-accrual status when there is reasonable doubt that interest income will be collected. The Company considers many factors relevant to an investment when placing it on or removing it from non-accrual status including, but not limited to, the delinquency status of the investment, economic and business conditions, the overall financial condition of the underlying investment, the value of the underlying collateral, bankruptcy status, if any, and any other facts or circumstances relevant to the investment. If there is reasonable doubt that the Company will receive any previously accrued interest, then the accrued interest will be written-off. Payments received on non-accrual investments may be recognized as income or applied to principal depending upon the collectability of the remaining principal and interest. Non-accrual investments may be restored to accrual status when principal and interest become current and are likely to remain current based on the Company's judgment. Loan origination fees, original issue discount and market discount are capitalized and the Company accretes such amounts as interest income over the respective term of the loan or security. Upon the prepayment of a loan or security, any unamortized loan origination fees and original issue discount are recorded as interest income. Structuring and other non-recurring upfront fees are recorded as fee income when earned. The Company records prepayment premiums on loans and securities as fee income when it earns such amounts. For the year ended December 31, 2023, the Company recognized $591 in structuring or other upfront fee revenue. For the years ended December 31, 2022 and 2021, the Company did not recognize any structuring or other upfront fee revenue. Net Realized Gains or Losses, Net Change in Unrealized Appreciation or Depreciation and Net Change in Unrealized Gains or Losses on Foreign Currency: Gains or losses on the sale of investments are calculated by using the specific identification method. The Company measures realized gains or losses by the difference between the net proceeds from the repayment or sale and the amortized cost basis of the investment, without regard to unrealized appreciation or depreciation previously recognized, but considering unamortized fees. Net change in unrealized appreciation or depreciation reflects the change in portfolio investment values during the reporting period, including any reversal of previously recorded unrealized gains or losses when gains or losses are realized and the respective unrealized gain or loss on foreign currency for any foreign denominated investments it may hold. Net change in unrealized gains or losses on foreign currency reflects the change in the value of foreign currency held, receivables or accruals during the reporting period due to the impact of foreign currency fluctuations. Capital Gains Incentive Fee: Pursuant to the terms of the FS/EIG investment advisory agreement, the incentive fee on capital gains is determined and payable in arrears as of the end of each calendar year (or upon termination of such agreement). Such fee equals 20.0% of the Company’s “incentive fee capital gains,” which are the Company’s realized capital gains on a cumulative basis from inception, calculated as of the end of the applicable period, computed net of all realized capital losses and unrealized capital depreciation on a cumulative basis, less the aggregate amount of any previously paid incentive fees on capital gains. The Company will accrue for the incentive fee on capital gains, which, if earned, will be paid annually. The Company will accrue the incentive fee on capital gains based on net realized and unrealized gains; however, the fee payable to FS/EIG Advisor will be based on realized gains and no such fee will be payable with respect to unrealized gains unless and until such gains are actually realized. Subordinated Income Incentive Fee: Pursuant to the terms of the FS/EIG investment advisory agreement, FS/EIG Advisor may also be entitled to receive a subordinated incentive fee on income. The subordinated incentive fee on income under the FS/EIG investment advisory agreement is calculated and payable quarterly in arrears and equals 20.0% of the Company’s “pre-incentive fee net investment income” for the immediately preceding quarter subject to a hurdle rate, expressed as a rate of return on adjusted capital, equal to 1.625% per quarter, or an annualized hurdle rate of 6.5%. As a result, FS/EIG Advisor will not earn this incentive fee for any quarter until the Company’s pre-incentive fee net investment income for such quarter exceeds the hurdle rate of 1.625%. For purposes of this fee, ‘‘adjusted capital’’ means cumulative gross proceeds generated from sales of the Company’s common shares (including proceeds from its distribution reinvestment plan) reduced for distributions from non-liquidating dispositions of the Company’s investments paid to shareholders and amounts paid for share repurchases pursuant to the Company’s share repurchase program. Once the Company’s pre-incentive fee net investment income in any quarter exceeds the hurdle rate, FS/EIG Advisor will be entitled to a “catch-up” fee equal to the amount of the Company’s pre-incentive fee net investment income in excess of the hurdle rate, until the Company’s pre-incentive fee net investment income for such quarter equals 2.031%, or 8.125% annually, of adjusted capital. This “catch-up” feature will allow FS/EIG Advisor to recoup the fees foregone as a result of the existence of the hurdle rate. Thereafter, FS/EIG Advisor will be entitled to receive 20.0% of the Company’s pre-incentive fee net investment income. Fixed Price Swaps : The Company may enter into fixed price swap contracts to economically hedge against the variability in cash flows associated with the sale of future crude oil and natural gas production. While the use of these derivative instruments limits the downside risk of adverse price movements, their use also limits future revenues from upward price movements. The Company's fixed price swaps are settled monthly based on differences between the fixed price specified in the contract and the referenced settlement price. When the referenced settlement price is less than the price specified in the contract, the Company receives an amount from the counterparty based on the price difference multiplied by the volume. Similarly, when the referenced settlement price exceeds the price specified in the contract, the Company pays the counterparty an amount based on the price difference multiplied by the volume. Total Return Swaps: The Company may enter into total return swaps to obtain exposure to a security or market without owning such security or investing directly in such market or to exchange the risk/return of one market with another market. Total return swaps are agreements in which there is an exchange of cash flows whereby one party agrees to make periodic payments based on the total return (distributions plus capital gains/losses) of an underlying instrument in exchange for fixed or floating rate interest payments. If the total return of the instrument or index underlying the transaction exceeds or falls short of the offsetting fixed or floating interest rate obligation, the Company receives payment from or makes a payment to the counterparty. Income Taxes: The Company has elected to be treated for U.S. federal income tax purposes, and intends to qualify annually, as a RIC under Subchapter M of the Code. To maintain qualification as a RIC and maintain RIC tax treatment, the Company must, among other things, meet certain source-of-income and asset diversification requirements, as well as distribute to its shareholders, in respect of each tax year, dividends of an amount generally at least equal to 90% of its "investment company taxable income," which is generally the Company's net ordinary income plus the excess, if any, of realized net short-term capital gains over realized net long-term capital losses, determined without regarding to any deduction for dividends paid. As a RIC, the Company will not have to pay corporate-level U.S. federal income taxes on any ordinary income or capital gains that it distributes as dividends to its shareholders. The Company intends to make distributions in an amount sufficient to qualify for and maintain its RIC tax treatment each tax year and to not pay any U.S. federal income taxes on income so distributed. The Company will also be subject to nondeductible U.S. federal excise taxes if it does not timely distribute dividends each calendar year of an amount at least equal to the sum of 98% of ordinary income (taking into account certain deferrals and elections) for the calendar year, 98.2% of any capital gain net income (adjusted for certain ordinary losses) for the one-year period ending on October 31 of such calendar year, and any recognized and undistributed ordinary income from prior years for which it paid no income taxes. Certain of the Company’s consolidated subsidiaries are subject to U.S. federal and state income taxes. Uncertainty in Income Taxes: The Company evaluates its tax positions to determine if the tax positions taken meet the minimum recognition threshold in connection with accounting for uncertainties in income tax positions taken or expected to be taken for the purposes of measuring and recognizing tax benefits or liabilities in the consolidated financial statements. Recognition of a tax benefit or liability with respect to an uncertain tax position is required only when the position is "more likely than not" to be sustained assuming examination by taxing authorities. The Company recognizes interest and penalties, if any, related to unrecognized tax liabilities as income tax expense in the consolidated statements of operations. During the years ended December 31, 2023, 2022 and 2021, the Company did not incur any interest or penalties. The Company has analyzed the tax positions taken on federal and state income tax returns for all open tax years, and has recorded a provision for taxes related to its wholly-owned taxable subsidiaries for the years ended December 31, 2023 and 2022 of $0 and $1,207, respectively. The Company's federal and state income and federal excise tax returns for tax years for which the applicable statutes of limitations have not expired are subject to examination by the Internal Revenue Service and state departments of revenue. Distributions: Distributions to the Company's shareholders are recorded as of the record date. Subject to the discretion of the Company's board of trustees and applicable legal restrictions, the Company expects to declare and pay enhanced cash distributions on a quarterly basis. Net realized capital gains, if any, are distributed or deemed distributed at least annually. Reclassifications: Certain amounts in the consolidated financial statements for the years ended December 31, 2022 and 2021 may have been reclassified to conform to the classifications used to prepare the consolidated financial statements for the year ended December 31, 2023. Recent Accounting Pronouncements: In June 2022, the FASB issued Accounting Standards Update No. 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions , or ASU 2022-03, which clarifies guidance for fair value measurement of an equity security subject to a contractual sale restriction and establishes new disclosure requirements for such equity securities. ASU 2022-03 is effective for fiscal years beginning after December 15, 2023 and for interim periods within those fiscal years, with early adoption permitted. The Company has concluded that this guidance will not have a material impact on its consolidated financial statements.

Share Transactions

Share Transactions	12 Months Ended
Share Transactions	Dec. 31, 2023
Equity [Abstract]
Share Transactions	Share Transactions Below is a summary of transactions with respect to the Company’s common shares during the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, 2023 2022 2021 Shares Amount Shares Amount Shares Amount Reinvestment of Distributions (1) 4,040,482 $ 15,549 5,376,174 $ 20,861 6,069,376 $ 21,135 Proceeds from Share Transactions 4,040,482 $ 15,549 5,376,174 $ 20,861 6,069,376 $ 21,135 ______________ (1) On September 15, 2023, the Company's second amended and restated distribution reinvestment plan terminated. On July 19, 2023, the Company’s board of trustees, including the independent trustees, approved the termination of the Company’s second amended and restated distribution reinvestment plan with respect to distributions declared by the Company’s board of trustees on the Company’s common shares, effective as of September 15, 2023. After this date, all shareholders will receive any subsequent distributions in cash. On February 25, 2020, the Company received exemptive relief from the SEC permitting it to offer multiple classes of common shares. While the Company has no present intention to recommence a public offering of its common shares, the Company could do so in the future. Share Repurchase Program In March 2020, in light of difficult market conditions and in an effort to preserve liquidity in the Company, the Company’s board of trustees determined to suspend for an indefinite period of time the Company’s share repurchase program and will reassess the Company’s ability to recommence such program in future periods. Prior to its suspension, the Company intended to conduct quarterly tender offers pursuant to its share repurchase program. The Company's board of trustees will consider the following factors, among others, in making its determination regarding whether to cause the Company to offer to repurchase common shares and under what terms: • the effect of such repurchases on the Company’s qualification as a RIC (including the consequences of any necessary asset sales); • the liquidity of the Company's assets (including fees and costs associated with disposing of assets); • the Company’s investment plans and working capital requirements; • the relative economies of scale with respect to the Company’s size; • the Company’s history in repurchasing common shares or portions thereof; and • the condition of the securities markets. On May 5, 2017, the board of trustees of the Company further amended the share repurchase program. As amended, the Company limited the maximum number of common shares to be repurchased for any repurchase offer to the greater of (A) the number of common shares that the Company can repurchase with the proceeds it has received from the sale of common shares under its distribution reinvestment plan during the twelve-month period ending on the date the applicable repurchase offer expires (less the amount of proceeds used to repurchase common shares on each previous repurchase date for repurchase offers conducted during such twelve-month period) (this limitation is referred to as the twelve-month repurchase limitation) and (B) the number of common shares that the Company can repurchase with the proceeds the Company receives from the sale of common shares under its distribution reinvestment plan during the three-month period ending on the date the applicable repurchase offer expires (this limitation is referred to as the three-month repurchase limitation). In addition to this limitation, the maximum number of common shares to be repurchased for any repurchase offer has also been limited to 10% of the weighted average number of common shares outstanding in the prior calendar year, or 2.5% in each calendar quarter. As a result, the maximum number of common shares to be repurchased for any repurchase offer would not exceed the lesser of (i) 10% of the weighted average number of common shares outstanding in the prior calendar year, or 2.5% in each calendar quarter, and (ii) whichever is greater of the twelve-month repurchase limitation described in clause (A) above and the three-month repurchase limitation described in clause (B) above. Historically, pursuant to the Company's share repurchase program, the Company offered to repurchase common shares at a price equal to the price at which common shares were issued pursuant to the Company’s distribution reinvestment plan on the distribution date coinciding with the applicable share repurchase date. The price at which common shares were issued under the Company’s distribution reinvestment plan was determined by the Company’s board of trustees or a committee thereof, in its sole discretion, and was (i) not less than the net asset value per common share as determined in good faith by the Company’s board of trustees or a committee thereof, in its sole discretion, immediately prior to the payment date of the distribution and (ii) not more than 2.5% greater than the net asset value per common share as of such date. The Company’s board of trustees may amend, suspend or terminate the share repurchase program at any time, upon 30 days’ notice. The Company did not repurchase any shares pursuant to its share repurchase program during the years ended December 31, 2023, 2022 and 2021. The Company's distribution reinvestment plan was terminated effective September 15, 2023. In order to minimize the expense of supporting small accounts and provide additional liquidity to shareholders of the Company holding small accounts after completion of a regular quarterly share repurchase offer, the Company reserves the right to repurchase the shares of and liquidate any investor’s account if the balance of such account is less than the Company’s $5 minimum initial investment, unless the account balance has fallen below the minimum solely as a result of a decline in the Company’s net asset value per share. The Company will provide or will cause to be provided 30 days’ prior written notice to potentially affected investors, which notice may be included in regular quarterly repurchase offer materials, of any such repurchase. Historically, any such repurchases were made at the Company’s most recent price at which the Company’s shares were issued pursuant to its distribution reinvestment plan. There were no de minimis account liquidations during the years ended December 31, 2023, 2022 and 2021.

Related Party Transactions

Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2023
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Compensation of the Investment Adviser Pursuant to the FS/EIG investment advisory agreement, FS/EIG Advisor is entitled to an annual base management fee based on the average weekly value of the Company’s gross assets (gross assets equals total assets as set forth on the Company’s consolidated balance sheets) during the most recently completed calendar quarter and an incentive fee based on the Company’s performance. The base management fee is payable quarterly in arrears, and is calculated at an annual rate of 1.75% of the average weekly value of the Company’s gross assets. See Note 2 for a discussion of the capital gains and subordinated income incentive fees that FS/EIG Advisor may be entitled to under the FS/EIG investment advisory agreement. During the years ended December 31, 2023, 2022 and 2021, there were no capital gains or subordinated income incentive fees accrued or paid to FS/EIG Advisor. FS/EIG Advisor may receive structuring or other upfront fees from portfolio companies in which FS/EIG Advisor has caused the Company to invest. FS/EIG Advisor has agreed to offset the amount of any structuring, upfront or certain other fees received by FS/EIG Advisor or its members against the management fees payable by the Company under the FS/EIG investment advisory agreement. During the years ended December 31, 2023, 2022 and 2021, $341, $2,619 and $1,439, respectively, of structuring, upfront or certain other fees received by FS/EIG Advisor or its members were offset against management fees. Pursuant to the FS/EIG investment advisory agreement, FS/EIG Advisor oversees the Company’s day-to-day operations, including the provision of general ledger accounting, fund accounting, legal services, investor relations, certain government and regulatory affairs activities and other administrative services. FS/EIG Advisor also performs, or oversees the performance of, the Company’s corporate operations and required administrative services, which includes being responsible for the financial records that the Company is required to maintain and preparing reports for the Company’s shareholders and reports filed with the SEC. The Company reimburses FS/EIG Advisor for expenses necessary to perform services related to the Company’s administration and operations, including FS/EIG Advisor’s allocable portion of the compensation and/or related expenses of certain personnel of FS Investments and EIG providing administrative services to the Company on behalf of FS/EIG Advisor, and for transactional expenses for prospective investments, such as fees and expenses associated with performing due diligence reviews of investments that do not close, often referred to as "broken deal" costs. The Company reimburses FS/EIG Advisor no less than quarterly for expenses necessary to perform services related to the Company’s administration and operations. The amount of this reimbursement is set at the lesser of (1) FS/EIG Advisor’s actual costs incurred in providing such services and (2) the amount that the Company estimates it would be required to pay alternative service providers for comparable services in the same geographic location. FS/EIG Advisor allocates the cost of such services to the Company based on factors such as time allocations and other reasonable metrics. The Company’s board of trustees reviews the methodology employed in determining how the expenses are allocated to the Company and assesses the reasonableness of such reimbursements for expenses allocated to the Company based on the breadth, depth and quality of such services as compared to the estimated cost to the Company of obtaining similar services from third-party providers known to be available. In addition, the Company’s board of trustees considers whether any single third-party service provider would be capable of providing all such services at comparable cost and quality. Finally, the Company’s board of trustees, among other things, compares the total amount paid to FS/EIG Advisor for such services as a percentage of the Company’s net assets to the same ratio as reported by other comparable BDCs. The Company does not reimburse FS/EIG Advisor for any services for which it receives a separate fee, or for rent, depreciation, utilities, capital equipment or other administrative items allocated to a controlling person of FS/EIG Advisor. The following table describes the fees and expenses accrued under the FS/EIG investment advisory agreement during the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, Related Party Source Agreement Description 2023 2022 2021 FS/EIG Advisor FS/EIG investment advisory agreement Base Management Fee (1) $ 35,036 $ 41,940 $ 40,122 FS/EIG Advisor FS/EIG investment advisory agreement Administrative Services Expenses (2) $ 6,087 $ 5,626 $ 5,713 _________________________ (1) During the years ended December 31, 2023, 2022 and 2021, $37,805, $41,221 and $39,812, respectively, in base management fees were paid to FS/EIG Advisor. The base management fee amount shown in the table above for the years ended December 31, 2023, 2022 and 2021 is shown net of $341, $2,619 and $1,439, respectively, in structuring, upfront or certain other fees received by FS/EIG Advisor or its members and offset against base management fees. As of December 31, 2023, $8,416 in base management fees were payable to FS/EIG Advisor. (2) During the years ended December 31, 2023, 2022 and 2021, $4,431, $3,930 and $3,450, respectively, of the accrued administrative services expenses related to the allocation of costs of administrative personnel for services rendered to the Company by FS/EIG Advisor and the remainder related to other reimbursable expenses. The Company paid $6,469, $5,134 and $4,849 in administrative services expenses to FS/EIG Advisor, or its affiliates, during the years ended December 31, 2023, 2022 and 2021, respectively. Potential Conflicts of Interest The members of the senior management and investment teams of FS/EIG Advisor serve or may serve as officers, directors or principals of entities that operate in the same or a related line of business as the Company does, or of investment vehicles managed by the same personnel. The officers, managers and other personnel of FS/EIG Advisor may serve in similar or other capacities for the investment advisers to future investment vehicles affiliated with FS Investments or EIG. In serving in these multiple and other capacities, they may have obligations to other clients or investors in those entities, the fulfillment of which may not be in the Company’s best interests or in the best interest of the Company’s shareholders. The Company’s investment objectives may overlap with the investment objectives of such investment funds, accounts or other investment vehicles. Exemptive Relief

Distributions

Distributions	12 Months Ended
Distributions	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Distributions	Distributions The following table reflects the cash distributions per share that the Company has declared on its common shares during the years ended December 31, 2023, 2022 and 2021: Distribution For the Year Ended December 31, Per Share Amount 2021 $ 0.1200 $ 53,264 2022 $ 0.1200 $ 53,938 2023 $ 0.1892 $ 86,059 Subject to applicable legal restrictions and the sole discretion of the Company's board of trustees, the Company expects to provide enhanced quarterly distributions to shareholders until the achievement of a long-term liquidity event. On October 18, 2023, the Company's board of trustees declared the initial enhanced cash distribution of $0.0683 per share for the quarter ended September 30, 2023. For the quarter ended December 31, 2023, the distribution amount per share was $0.0643, comprised of an initial distribution per share of $0.0609 declared in December 2023 and the remaining distribution per share of $0.0034 declared in January 2024, representing an annualized distribution rate to shareholders of 7.5% based on the net asset value of $3.43 per share as of December 31, 2023. The enhanced distributions are expected to be paid quarterly and increase in subsequent years until the achievement of a long-term liquidity event, subject to a maximum cap of 15.0% of the Company's then-current estimated net asset value beyond 2026. The Company expects a portion of the distributions may represent a return of investor capital, helping to accelerate liquidity for shareholders in the near-term. There can be no assurance that the Company will be able to pay distributions in the future. The timing and amount of any future distributions to shareholders are subject to applicable legal restrictions and the sole discretion of the Company's board of trustees. Historically, the Company had an “opt in” distribution reinvestment plan for its shareholders. As a result, if the Company made a cash distribution, its shareholders would receive distributions in cash unless they specifically “opted in” to the distribution reinvestment plan so as to have their cash distributions reinvested in additional common shares. However, certain state authorities or regulators may have imposed restrictions from time to time that may have prevented or limited a shareholder’s ability to participate in the distribution reinvestment plan. The Company's distribution reinvestment plan was terminated effective as of September 15, 2023. Under the prior distribution reinvestment plan, cash distributions to participating shareholders would be reinvested in additional common shares at a purchase price determined by the Company's board of trustees, or a committee thereof, in its sole discretion, that was (i) not less than the net asset value per common share as determined in good faith by the Company's board of trustees or a committee thereof, in its sole discretion, immediately prior to the payment of the distribution and (ii) not more than 2.5% greater than the net asset value per common share as of such date. Any distributions reinvested under the plan would remain taxable to a U.S. shareholder. The Company may fund its cash distributions to shareholders from any sources of funds legally available to it, including proceeds from the sale of the Company’s common shares, borrowings, net investment income from operations, capital gains proceeds from the sale of assets and non-capital gains proceeds from the sale of assets, dividends or other distributions paid to the Company on account of preferred and common equity investments in portfolio companies. The Company has not established limits on the amount of funds it may use from available sources to make distributions. The Company's distribution proceeds have exceeded and in the future may exceed its earnings. Therefore, portions of the distributions that the Company has made represented, and may make in the future may represent, a return of capital to shareholders, which lowers their tax basis in their common shares. A return of capital generally is a return of a shareholder’s investment rather than a return of earnings or gains derived from the Company’s investment activities. Each year a statement on Form 1099-DIV identifying the sources of the distributions (i.e., paid from ordinary income, paid from net capital gains on the sale of securities, and/or a return of capital, which is a nontaxable distribution) will be mailed to the Company’s shareholders. There can be no assurance that the Company will be able to pay distributions at a specific rate or at all. The following table reflects the sources of the cash distributions on a tax basis that the Company declared on its common shares during the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, 2023 2022 2021 Source of Distribution Distribution Amount Percentage Distribution Amount Percentage Distribution Amount Percentage Net investment income (1) $ 86,059 100 % $ 53,938 100 % $ 53,264 100 % Short-term capital gains proceeds from the sale of assets — — — — — — Long-term capital gains proceeds from the sale of assets — — — — — — Return of capital — — — — — — Total $ 86,059 100 % $ 53,938 100 % $ 53,264 100 % ______________________________ (1) During the years ended December 31, 2023, 2022 and 2021, 87.1%, 85.5% and 74.1%, respectively, of the Company's gross investment income was attributable to cash income earned, 9.0%, 10.8% and 18.5%, respectively, was attributable to paid-in-kind, or PIK, interest and 3.9%, 3.7% and 7.4%, respectively, was attributable to non-cash accretion of discount. The Company’s net investment income on a tax basis for the years ended December 31, 2023, 2022 and 2021 was $101,804, $69,711 and $80,892, respectively. As of December 31, 2023 and 2022, the Company had $36,369 and $21,803, respectively, of undistributed ordinary income on a tax basis. The difference between the Company’s GAAP-basis net investment income and its tax-basis net investment income was primarily due to the reclassification of unamortized original issue discount, certain prepayment fees recognized upon prepayment of loans from income for GAAP purposes to realized gains for tax purposes, the impact of certain subsidiaries that are consolidated for purposes of computing GAAP-basis net investment income but are not consolidated for purposes of computing tax-basis net investment income and income recognized for GAAP purposes on certain transactions but not subject to tax or income recognized for tax purposes on certain transactions but not recognized for GAAP purposes. The Company’s undistributed net investment income on a tax basis may be adjusted following the filing of the Company’s tax returns. The following table sets forth a reconciliation between GAAP-basis net investment income and tax-basis net investment income during the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, 2023 2022 2021 GAAP-basis net investment income $ 81,363 $ 69,769 $ 43,259 Reclassification of unamortized original issue discount and prepayment fees (5,072) (12,480) (4,030) GAAP vs. tax-basis impact of consolidation of certain subsidiaries 2,652 1,242 13,532 Income subject to tax not recorded for GAAP (income recorded for GAAP not subject to tax) 22,612 13,036 28,182 Other miscellaneous differences 249 (1,856) (51) Tax-basis net investment income $ 101,804 $ 69,711 $ 80,892 The Company may make certain adjustments to the classification of shareholders’ equity as a result of permanent book-to-tax differences. During the year ended December 31, 2023, the Company increased accumulated earnings (deficit) and reduced capital in excess of par value by $21,053. During the year ended December 31, 2022, the Company reduced accumulated earnings (deficit) and increased capital in excess of par value by $41,185. The determination of the tax attributes of the Company’s distributions is made annually as of the end of the Company’s fiscal year based upon the Company’s taxable income for the full year and distributions paid for the full year. Therefore, a determination made on a quarterly basis may not be representative of the actual tax attributes of the Company's distributions for a full year . The actual tax characteristics of distributions to shareholders are reported to shareholders annually on Form 1099-DIV. As of December 31, 2023 and 2022, the components of accumulated earnings on a tax basis were as follows: December 31, 2023 2022 Distributable ordinary income $ 36,369 $ 21,803 Accumulated capital losses (1) (1,595,362) (1,282,145) Other temporary differences (670) (83) Net unrealized appreciation (depreciation) on investments, swap contracts and foreign currency (2) (64,522) (177,571) Total $ (1,624,185) $ (1,437,996) ______________________________ (1) Net capital losses may be carried forward indefinitely, and their character is retained as short-term or long-term. As of December 31, 2023, the Company had short-term and long-term capital loss carryforwards available to offset future realized capital gains of $74,081 and $1,521,281, respectively. (2) As of December 31, 2023 and 2022, for federal income tax purposes, the gross unrealized appreciation on the Company's investments was $148,817 and $334,635, respectively, and the gross unrealized depreciation on the Company's investments, swap contracts and unrealized loss on foreign currency was $213,339 and $512,206, respectively. The aggregate cost of the Company's investments for federal income tax purposes totaled $1,587,709 and $2,223,943 as of December 31, 2023 and 2022, respectively. The aggregate net unrealized appreciation (depreciation) of the Company's investments on a tax basis was $(64,513) and $(176,828) as of December 31, 2023 and 2022, respectively. As of December 31, 2023 and 2022, the Company had deferred tax assets of $142,608 and $145,383, respectively, particularly resulting from interest expense disallowance, net operating losses and capital losses of the Company's wholly-owned taxable subsidiaries. As of December 31, 2023 and 2022, the Company had deferred tax liabilities of $2,595 and $28,753, respectively, resulting from unrealized appreciation on investments held by the Company's wholly-owned taxable subsidiaries. As of December 31, 2023 and 2022, certain wholly-owned taxable subsidiaries anticipated that they would be unable to fully utilize their deferred tax assets, therefore the deferred tax assets were offset by valuation allowances of $140,013 and of $116,630, respectively. For the year ended December 31, 2022, the Company recorded a provision for taxes related to its wholly-owned taxable subsidiaries of $1,207 related to current taxes.

Financial Instruments

Financial Instruments	12 Months Ended
Financial Instruments	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Instruments	The Company may trade in financial instruments with off-balance sheet risk in the normal course of its investing activities. During the years ended December 31, 2023 and 2022, the Company utilized commodity fixed price swaps to economically hedge certain risks against natural gas and crude oil price exposure related to certain investments in the Company's portfolio. During the year ended December 31, 2023, the Company entered into an equity total return swap to obtain exposure to a security without owning such security. During the year ended December 31, 2021, the Company did not utilize any swap contracts. While the use of these derivative instruments limits the downside risk of adverse price movements, their use also limits future revenues from upward price movements. Fixed Price Swaps A fixed price swap is a contract between two parties in which settlements are made at a specified time based on the difference between the fixed price specified in the contract and the referenced settlement price. When the referenced settlement price is less than the price specified in the contract, the Company receives an amount from the counterparty based on the price difference multiplied by the volume. Similarly, when the referenced settlement price exceeds the price specified in the contract, the Company pays the counterparty an amount based on the price difference multiplied by the volume. The Company's fixed price swaps are settled monthly and the settlement prices contained in these fixed price swaps are based on commodity exchanges; the NYMEX Henry Hub for natural gas and the ICE Brent for oil. Gas volumes are measured in one million British thermal units, or MMBtus, and oil volumes are measured in barrels, or Bbls. The changes in the value of the fixed price swaps are recorded as unrealized appreciation or depreciation on swap contracts in the consolidated balance sheets. The Company's fixed price swaps settle monthly and the changes in the value of the fixed price swaps are recorded as realized gains or losses in the consolidated statements of operations. The primary underlying risk exposure through the use of fixed price swaps is commodity price risk of the underlying commodity, such as natural gas and crude oil. As of December 31, 2023, the Company's fixed price swaps were fully terminated. Total Return Swaps A total return swap is a contract in which there is an exchange of cash flows whereby one party agrees to make periodic payments based on the total return (distributions plus capital gains/losses) of an underlying instrument in exchange for fixed or floating rate interest payments. If the total return of the instrument or index underlying the transaction exceeds or falls short of the offsetting fixed or floating interest rate obligation, the Company receives payment from or makes a payment to the counterparty. Total return swaps are entered into to obtain exposure to a security or market without owning such security or investing directly in such market or to exchange the risk/return of one market with another market. On September 20, 2023, the Company entered into an equity total return swap, or equity TRS, with Nomura Global Financial Products Inc., or Nomura. Under the equity TRS, the Company obtains the economic benefit of owning shares of FS Credit Opportunities Corp., or FSCO, an investment company registered under the 1940 Act, without actually owning them, and Nomura will receive an interest-type payment in return. The investment adviser to FSCO is wholly-owned by Franklin Square Holdings, L.P., which is also the majority owner of FS/EIG Advisor. The Company's equity TRS is marked-to-market daily and the change in market value is recorded as unrealized appreciation or depreciation on swap contracts in the consolidated balance sheets. Pursuant to its terms, the Company's equity TRS settles monthly and a realized gain or loss is recorded in the consolidated statements of operations equal to the difference between the value of the shares underlying the equity TRS at the time the swap was entered into or the previous settlement date and the value as of the current settlement date, plus dividends received and less accrued interest. Any dividends received by Nomura as holder of the FSCO shares are paid to the Company. The equity TRS has a term of three years, but it could be terminated earlier in whole or in part following the occurrence of certain prescribed events agreed to between Nomura and the Company. The primary underlying risk exposure through the use of equity total return swaps is equity market risk. During the years ended December 31, 2023 and 2022, the average monthly notional volume of fixed price swap contracts—crude oil and fixed price swap contracts—natural gas outstanding were 88,849 Bbls and 207,555 Bbls, respectively, and 169,313 MMBtus and 398,707 MMBtus, respectively. The average notional amount of the equity total return swap from the initial trade date of September 25, 2023 through December 31, 2023 was $19,939. The following table presents the fair value of swap contracts (which are not considered to be hedging instruments for accounting purposes) as of December 31, 2023 and 2022: December 31, 2023 December 31, 2022 Instrument Asset Liability Asset Liability (1) Commodity Fixed Price Swaps—Crude Oil $ — $ — $ — $ (572) Commodity Fixed Price Swaps—Natural Gas — — — (126) Equity Total Return Swaps — — — — Total $ — $ — $ — $ (698) ______________ (1) Reflected on the Company's consolidated balance sheets as: Unrealized depreciation on swap contracts. The effect of swap contracts (which are not considered to be hedging instruments for accounting purposes) on the Company's statements of operations for the years ended December 31, 2023 and 2022 were as follows: Net Realized Gains (Losses) (1) Net Change in Unrealized Appreciation (Depreciation) (2) Year Ended December 31, Year Ended December 31, Instrument 2023 2022 2023 2022 Commodity Fixed Price Swaps—Crude Oil $ (363) $ (2,030) $ 572 $ (572) Commodity Fixed Price Swaps—Natural Gas 394 (755) 126 (126) Equity Total Return Swaps 1,017 — — — Total $ 1,048 $ (2,785) $ 698 $ (698) ______________ (1) Reflected on the Company's consolidated statements of operations as: Net realized gain (loss) on swap contracts. (2) Reflected on the Company's consolidated statements of operations as: Net change in unrealized appreciation (depreciation) on swap contracts. Offsetting of Derivative Instruments The Company has derivative instruments that are subject to master netting agreements. These agreements include provisions to offset positions with the same counterparty in the event of default by one of the parties. The Company’s unrealized appreciation and depreciation on derivative instruments are reported as gross assets and liabilities, respectively, in the consolidated balance sheets. The following table presents the Company’s derivative assets and liabilities by counterparty, net of amounts available for offset under a master netting agreement as of December 31, 2022: As of December 31, 2022 Counterparty Derivative Assets Derivative Liabilities Net Value of Derivatives Non-Cash Collateral (Received) Pledged (1) Cash Collateral (Received) Pledged (1) Net Amount of Derivative Assets (Liabilities) (2) BP Energy Co. — $ (698) $ (698) — — $ (698) ______________ (1) In some instances, the actual amount of the collateral received and/or pledged may be more than the amount shown due to overcollateralization. (2) Net amount of derivative assets and liabilities represents the net amount due from the counterparty to the Company and the net amount due from the Company to the counterparty, respectively, in the event of default.

Investment Portfolio

Investment Portfolio	12 Months Ended
Investment Portfolio	Dec. 31, 2023
Schedule of Investments [Abstract]
Investment Portfolio	Investment Portfolio The following table summarizes the composition of the Company’s investment portfolio at cost and fair value as of December 31, 2023 and 2022: December 31, 2023 December 31, 2022 Amortized (1) Fair Value Percentage Amortized (1) Fair Value Percentage Senior Secured Loans—First Lien $ 878,013 $ 825,158 54 % $ 702,842 $ 706,646 35 % Senior Secured Loans—Second Lien 55,064 54,424 4 % 143,153 143,270 7 % Senior Secured Bonds 82,793 84,468 5 % 10,064 10,074 0 % Unsecured Debt — — — 253,675 241,418 12 % Preferred Equity 252,450 259,990 17 % 425,182 400,414 20 % Sustainable Infrastructure Investments, LLC 43,150 39,427 3 % 54,514 51,098 2 % Equity/Other 211,461 238,729 16 % 333,510 494,195 24 % Short-Term Investments 20,994 21,000 1 % — — — Total $ 1,543,925 $ 1,523,196 100 % $ 1,922,940 $ 2,047,115 100 % _________________________ (1) Amortized cost represents the original cost adjusted for the amortization of premiums and/or accretion of discounts, as applicable, on investments. In general, under the 1940 Act, the Company would be presumed to “control” a portfolio company if it owned more than 25% of its voting securities or it had the power to exercise control over the management or policies of a portfolio company, and would be an “affiliated person” of a portfolio company if it owned 5% or more of its voting securities. As of December 31, 2023, the Company held investments in four portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control” and held investments in three portfolio companies of which it is deemed to “control.” For additional information with respect to such portfolio companies, see footnotes (u) and (v) to the consolidated schedule of investments as of December 31, 2023. As of December 31, 2022, the Company held investments in six portfolio companies of which it is deemed to be an “affiliated person” but is not deemed to “control” and held investments in three portfolio companies of which it is deemed to “control.” For additional information with respect to such portfolio companies, see footnotes (t) and (u) to the consolidated schedule of investments as of December 31, 2022. The Company’s investment portfolio may contain loans or bonds that are in the form of lines of credit or revolving credit facilities, or other investments, pursuant to which the Company may be required to provide funding when requested by portfolio companies in accordance with the terms of the underlying agreements. As of December 31, 2023, the Company had five senior secured loan investments with aggregate unfunded commitments of $11,232 and unfunded commitments of $18,989 in U.S. dollars and $858 in Canadian dollars to contribute capital to Sustainable Infrastructure Investments, LLC. As of December 31, 2022, the Company had six senior secured loan investments with aggregate unfunded commitments of $25,891 and an unfunded commitment of $7,625 in U.S dollars and $858 in Canadian dollars to contribute to Sustainable Infrastructure Investments, LLC. The Company maintains sufficient cash on hand, available borrowings and/or liquid securities to fund such unfunded commitments should the need arise. The table below describes investments by industry classification and enumerates the percentage, by fair value, of the total portfolio assets in such industries as of December 31, 2023 and 2022: December 31, 2023 December 31, 2022 Industry Classification Fair Value Percentage Fair Value Percentage Energy—Upstream $ 309,456 20 % $ 854,974 42 % Energy—Midstream 303,175 20 % 646,488 32 % Consumer Services 156,089 10 % — — Capital Goods 116,454 8 % — — Financial Services 83,197 6 % — — Health Care Equipment & Services 73,105 5 % — — Energy—Power 69,696 5 % 386,007 19 % Commercial & Professional Services (1) 62,036 4 % 12,508 0 % Materials 49,653 3 % — — Automobiles & Components 39,521 3 % — — Consumer Discretionary Distribution & Retail 37,428 3 % — — Energy—Service & Equipment (1) 33,734 2 % 96,040 5 % Transportation 30,157 2 % — — U.S. Treasury Bills 21,000 1 % — — Household & Personal Products 20,858 1 % — — Insurance 20,251 1 % — — Media & Entertainment 19,829 1 % — — Pharmaceuticals, Biotechnology & Life Sciences 19,300 1 % — — Consumer Staples Distribution & Retail 18,830 1 % — — Sustainable Infrastructure Investments, LLC (2) 39,427 3 % 51,098 2 % Total $ 1,523,196 100 % $ 2,047,115 100 % ____________ (1) FS/EIG Advisor monitors the industry classification of the Company’s investments and may from time to time reclassify such investments if it determines such reclassification is appropriate. During the years ended December 31, 2023 and 2022, two investments had their industry re-classified from Energy—Industrials to Commercial & Professional Services, and one investment had its industry re-classified from Energy—Service & Equipment to Commercial & Professional Services. (2) Sustainable Infrastructure Investments, LLC is generally comprised of midstream and renewables assets in the Energy sector. Sustainable Infrastructure Investments, LLC Sustainable Infrastructure Investments, LLC, or SIIJV, is a joint venture between the Company and Imperial Sustainable Infrastructure Investments, LLC, or Imperial, a subsidiary of Imperial Capital Asset Management, LLC, or ICAM. The joint venture is governed pursuant to the terms of an amended and restated limited liability company agreement of SIIJV, dated as of January 2, 2020, between the Company and Imperial, or the SIIJV Agreement. The SIIJV Agreement requires the Company and Imperial to provide capital to SIIJV of up to $67,629 in U.S. dollars and $5,430 in Canadian dollars in the aggregate where the Company and Imperial would provide 87.5% and 12.5%, respectively, of the committed capital. Pursuant to the terms of the SIIJV Agreement, the Company and Imperial each have 50% voting control of SIIJV and are required to agree on all investment decisions as well as all other significant actions for SIIJV. SIIJV invests in senior secured loans (both first lien and second lien) to middle market companies, broadly syndicated loans and other midstream, renewables and power assets. As administrative agent of SIIJV, the Company performs certain day-to-day management responsibilities on behalf of SIIJV and is entitled to a fee in the annual amount of 0.25% of SIIJV’s net assets under administration, calculated and payable quarterly in arrears. As of December 31, 2023, the Company and Imperial funded approximately $49,313 to SIIJV, of which $43,150 was from the Company. The Company does not consolidate SIIJV in its consolidated financial statements. On January 2, 2020, Seine Funding, LLC, or Seine Funding, a wholly-owned subsidiary of SIIJV, entered into a credit facility, as amended, or the Seine Funding Facility, with certain financial institutions as lender, agent, collateral agent, collateral administrator, and collateral custodian, and SIIJV, as collateral manager. The Seine Funding Facility provides for borrowings in U.S. dollars and certain agreed upon foreign currencies in an aggregate principal amount of up to $634,103 on a committed basis, which may be increased under certain circumstances at the request of Seine Funding and with the consent of the lender and agent. The end of the reinvestment period for the Seine Funding Facility was on December 31, 2020. The maturity date for the Seine Funding Facility is the earlier of (i) the latest maturity date among the assets securing the facility and (ii) the first date, after the end of the reinvestment period, on which all assets securing the facility are paid in full. Under the Seine Funding Facility, borrowings bear interest at the rate of Term SOFR plus a credit spread adjustment calculated by reference to the interest periods of particular loan assets per the terms of the credit agreement (or the relevant benchmark reference rate for any foreign currency borrowings) (in each case, subject to a floor of the higher of 0% and any applicable floor for particular loan assets), plus 1.20% per annum. Borrowings under the Seine Funding Facility are secured by a first priority security interest in substantially all of the assets of Seine Funding. As of December 31, 2023, total outstanding borrowings under the Seine Funding Facility were $145,483. Below is a summary of SIIJV's portfolio, followed by a listing of the individual loans in SIIJV's portfolio as of December 31, 2023 and 2022: December 31, 2023 December 31, 2022 Total investments (1) $ 170,083 $ 274,088 Weighted average current interest rate on debt investments (2) 7.45 % 6.96 % Number of portfolio assets in SIIJV 6 9 Largest investment in a single portfolio company (1) $ 57,227 $ 73,707 _______________ (1) At cost. (2) Computed as the (a) annual stated interest rate on accruing debt, divided by (b) total debt at par amount. Sustainable Infrastructure Investments, LLC Portfolio As of December 31, 2023 Portfolio Company (a)(f) Footnotes Energy Industry Rate (b) Maturity Principal (c) Amortized Fair (d) Senior Secured Loans—First Lien—100.0% Blue Heron Intermediate Holdco I, LLC Midstream S+188 4/22/24 $ 30,661 $ 30,661 $ 30,692 Copper Mountain Solar 3, LLC Renewables S+188 5/31/25 16,104 16,104 16,172 FLNG Liquefaction 2, LLC Midstream S+150 12/31/26 26,567 26,567 26,557 NES Hercules Class B Member, LLC Renewables S+163 1/31/28 24,176 24,176 24,769 ST EIP Holdco LLC Midstream S+250 11/5/24 57,227 57,227 57,143 Top of the World Wind Energy LLC Renewables S+213 12/1/28 15,348 15,348 15,616 Total Senior Secured Loans—First Lien 170,083 170,949 TOTAL INVESTMENTS—100.0% $ 170,083 $ 170,949 Sustainable Infrastructure Investments, LLC Portfolio As of December 31, 2022 Portfolio Company (a)(f) Footnotes Industry Rate (b) Maturity Principal (c) Amortized Fair (d) Senior Secured Loans—First Lien—100.0% Alianca Transportadora de Gas Participacoes S.A. Midstream L+260 5/23/27 $ 73,707 $ 73,707 $ 74,601 Blue Heron Intermediate Holdco I, LLC Midstream L+188 4/22/24 31,832 31,832 31,885 Cedar Creek II LLC Renewables L+188 11/18/23 8,710 8,710 8,722 Copper Mountain Solar 3, LLC Renewables L+175 5/31/25 17,804 17,804 17,879 FLNG Liquefaction 2, LLC Midstream L+150 12/31/26 28,170 28,170 27,990 Meikle Wind Energy, LP (e) Renewables C+150 5/12/24 C$ 16,030 12,332 11,873 NES Hercules Class B Member, LLC Renewables L+150 1/31/28 $ 24,487 24,487 24,954 ST EIP Holdco LLC Midstream L+250 11/5/24 58,673 58,673 58,288 Top of the World Wind Energy LLC Renewables L+188 12/1/28 18,373 18,373 18,866 Total Senior Secured Loans—First Lien 274,088 275,058 TOTAL INVESTMENTS—100.0% $ 274,088 $ 275,058 _____________________ Percentages are shown as a percentage of total investments. (a) Security may be an obligation of one or more entities affiliated with the named company. (b) Certain variable rate securities in SIIJV’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of December 31, 2023 and 2022, the three-month SOFR, or S, was 5.33% and 4.59%, respectively. SOFR based contracts may include a credit spread adjustment that is charged in addition to the base rate and basis point spread. As of December 31, 2022, the three-month LIBOR, or L, was 4.77% and the Canadian Dollar Offered Rate, or C, was 4.94%. (c) Denominated in U.S. dollars unless otherwise noted. (d) Security is classified as Level 3 and fair value is determined in accordance with SIIJV’s valuation process. (e) Investment denominated in Canadian dollars. Amortized cost and fair value are converted into U.S. dollars as of December 31, 2022. (f) Security or portion thereof is held within Seine Funding and is pledged as collateral supporting the amounts outstanding under the Seine Funding Facility. Below is selected balance sheet information for SIIJV as of December 31, 2023 and 2022: December 31, 2023 December 31, 2022 Selected Balance Sheet Information Total investments, at fair value $ 170,949 $ 275,058 Cash and other assets 29,089 10,380 Total assets $ 200,038 $ 285,438 Debt $ 145,483 $ 213,583 Other liabilities 3,406 3,358 Total liabilities 148,889 216,941 Members' equity $ 51,149 $ 68,497 Below is selected statement of operations information for SIIJV for the years ended December 31, 2023 and 2022: Year Ended December 31, 2023 2022 Selected Statement of Operations Information Total investment income $ 18,760 $ 11,463 Expenses Interest expense 12,438 6,994 Administrative services 173 166 Custodian and accounting fees 183 184 Professional services 203 125 Other 49 54 Total expenses 13,046 7,523 Net investment income 5,714 3,940 Net realized and unrealized gain (loss) (562) (821) Net increase in net assets resulting from operations $ 5,152 $ 3,119

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
Fair Value of Financial Instruments	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments Under existing accounting guidance, fair value is defined as the price that the Company would receive upon selling an investment or pay to transfer a liability in an orderly transaction to a market participant in the principal or most advantageous market for the investment. This accounting guidance emphasizes valuation techniques that maximize the use of observable market inputs and minimize the use of unobservable inputs. Inputs refer broadly to the assumptions that market participants would use in pricing an asset or liability, including assumptions about risk. Inputs may be observable or unobservable. Observable inputs are inputs that reflect the assumptions market participants would use in pricing an asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the assumptions market participants would use in pricing an asset or liability developed based on the best information available in the circumstances. The Company classifies the inputs used to measure these fair values into the following hierarchy as defined by current accounting guidance: Level 1: Inputs that are quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2: Inputs that are quoted prices for similar assets or liabilities in active markets. Level 3: Inputs that are unobservable for an asset or liability. A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. As of December 31, 2023 and 2022, the Company’s investments were categorized as follows in the fair value hierarchy: Valuation Inputs December 31, 2023 December 31, 2022 Level 1—Price quotations in active markets $ — $ 2,465 Level 2—Significant other observable inputs 683,716 450,445 Level 3—Significant unobservable inputs 839,480 1,594,205 Total $ 1,523,196 $ 2,047,115 As of December 31, 2023 and 2022, the Company’s swap contracts were categorized as follows in the fair value hierarchy: December 31, 2023 December 31, 2022 Valuation Inputs Assets Liabilities Assets Liabilities Level 1—Price quotations in active markets $ — $ — $ — $ — Level 2—Significant other observable inputs — — — 698 Level 3—Significant unobservable inputs — — — — Total $ — $ — $ — $ 698 The Company’s board of trustees is responsible for overseeing the valuation of the Company’s portfolio investments at fair value as determined in good faith pursuant to FS/EIG Advisor’s valuation policy. The Company’s board of trustees has designated FS/EIG Advisor with day-to-day responsibility for implementing the portfolio valuation process set forth in FS/EIG Advisor’s valuation policy. The Company’s investments consist primarily of investments that were acquired directly from the issuer. Debt investments, for which broker quotes or pricing information from third-party pricing services are not generally available, are valued by FS/EIG Advisor with the assistance of independent valuation firms, which determine a valuation range of fair value for such investments by considering, among other factors, the borrower’s ability to adequately service its debt, prevailing interest rates for like investments, call features, anticipated prepayments and other relevant terms of the investments. Except as described below, the Company’s investment in SIIJV and all of the Company’s preferred equity and equity/other investments are also valued by independent valuation firms, which determine the fair value of such investments by considering, among other factors, contractual rights ascribed to such investments, as well as various income scenarios and multiples of earnings before interest, taxes, depreciation and amortization, or EBITDA, cash flows, net income, revenues or, in limited instances, book value, PV-10 multiples or liquidation value. An investment that is newly issued and purchased near the date of the financial statements is valued at cost if FS/EIG Advisor determines that the cost of such investment is the best indication of its fair value. Such investments described above are typically classified as Level 3 within the fair value hierarchy. Investments that are traded on an active public market are valued at their closing price as of the date of the financial statements and are classified as Level 1 within the fair value hierarchy. Except as described above, FS/EIG Advisor typically values the Company’s other investments by using the midpoint of the prevailing bid and ask prices from dealers on the date of the relevant period end, which are provided by an independent third-party pricing service and screened for validity by such service and are typically classified as Level 2 within the fair value hierarchy. In determining the fair values of fixed price swaps, FS/EIG Advisor utilizes an industry-standard pricing model that considers various inputs including quoted forward prices for commodities, time value and current market and contractual prices for the underlying instruments. The fair value of the equity total return swap is determined daily based on the market price of the underlying asset. These assumptions are observable in the marketplace or can be corroborated by active markets or broker quotes and are typically classified as Level 2 within the fair value hierarchy. FS/EIG Advisor periodically benchmarks the bid and ask prices it receives from the third-party pricing service and/or dealers and independent valuation firms, as applicable, against the actual prices at which the Company purchases and sells its investments. Based on the results of the benchmark analysis and the experience of the Company’s management in purchasing and selling these investments, FS/EIG Advisor believes that these prices are reliable indicators of fair value. FS/EIG Advisor reviewed the valuation determinations made with respect to these investments in a manner consistent with FS/EIG Advisor’s valuation policy. The following is a reconciliation for the years ended December 31, 2023 and 2022 of investments for which significant unobservable inputs (Level 3) were used in determining fair value: For the Year Ended December 31, 2023 Senior Secured Senior Secured Senior Unsecured Debt Preferred Equity Sustainable Infrastructure Investments, LLC Equity/ Total Fair value at beginning of period $ 443,245 $ 143,270 $ 10,074 $ 54,374 $ 400,414 $ 51,098 $ 491,730 $ 1,594,205 Accretion of discount (amortization of premium) 2,227 757 42 107 1,230 — — 4,363 Net realized gain (loss) (8,935) (52) 6 232 (11,847) — (27,458) (48,054) Net change in unrealized appreciation (depreciation) (61,574) (756) (87) (95) 32,308 (307) (133,481) (163,992) Purchases 95,512 — — — — — 1,746 97,258 Paid-in-kind interest 9,858 — — 4,341 — — — 14,199 Sales and repayments (243,026) (88,795) (161) (58,959) (162,115) (11,364) (94,079) (658,499) Transfers into Level 3 — — — — — — — — Transfers out of Level 3 — — — — — — — — Fair value at end of period $ 237,307 $ 54,424 $ 9,874 $ — $ 259,990 $ 39,427 $ 238,458 $ 839,480 The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date $ (62,195) $ (440) $ (87) $ — $ 26,665 $ (307) $ (158,534) $ (194,898) For the Year Ended December 31, 2022 Senior Secured Senior Secured Senior Unsecured Debt Preferred Equity Sustainable Infrastructure Investments, LLC Equity/ Total Fair value at beginning of period $ 414,075 $ 84,083 $ 10,371 $ 104,659 $ 497,288 $ 50,770 $ 460,236 $ 1,621,482 Accretion of discount (amortization of premium) 1,781 275 48 151 4,194 — — 6,449 Net realized gain (loss) (12,186) 12 — (27,542) 7,203 — 71,214 38,701 Net change in unrealized appreciation (depreciation) 25,893 (644) (345) 34,305 (6,345) 328 61,335 114,527 Purchases 112,154 110,150 — 19,800 — — 16,052 258,156 Paid-in-kind interest 11,284 537 — 7,916 188 — — 19,925 Sales and repayments (168,461) (51,143) — (84,915) (102,114) — (117,107) (523,740) Transfers into Level 3 (1) 58,705 — — — — — — 58,705 Transfers out of Level 3 — — — — — — — — Fair value at end of period $ 443,245 $ 143,270 $ 10,074 $ 54,374 $ 400,414 $ 51,098 $ 491,730 $ 1,594,205 The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date $ 15,525 $ (421) $ (345) $ (382) $ (3,691) $ 328 $ 74,950 $ 85,964 ________________________ (1) Changes in inputs or methodologies used for valuing investments may result in transfers into or out of levels within the fair value hierarchy. Transfers between levels of the fair value hierarchy are deemed to have occurred at the beginning of the reporting period. For the year ended December 31, 2022, transfers into Level 3 were due to decreased price transparency. The valuation techniques and significant unobservable inputs used in recurring Level 3 fair value measurements as of December 31, 2023 and 2022 were as follows: Type of Investment Fair Value at December 31, 2023 Valuation Technique (1) Unobservable Input Range Weighted Senior Secured Loans—First Lien $ 212,250 Market Comparables Market Yield (%) 8.2%-20.5% 13.6% EBITDA Multiples (x) 3.9x-4.6x 4.4x 4,807 Discounted Cash Flow Discount Rate (%) 9.0%-13.0% 10.8% 20,250 Other (2) Senior Secured Loans—Second Lien 54,424 Market Comparables Market Yield (%) 12.5%-14.0% 13.1% Senior Secured Bonds 9,874 Market Comparables Market Yield (%) 7.5%-8.5% 8.0% Preferred Equity 259,990 Market Comparables Market Yield (%) 10.0%-23.0% 17.5% EBITDA Multiples (x) 12.0x-13.0x 12.5x Net Aircraft Book Value Multiple (x) 1.0x-1.1x 1.0x Sustainable Infrastructure Investments, LLC 39,427 Discounted Cash Flow Discount Rate (%) 8.0%-10.0% 9.0% Equity/Other 51,160 Market Comparables EBITDA Multiples (x) 2.7x-13.0x 6.0x Production Multiples (MMcfe/d) $3,000.0-$3,600.0 $3,300.0 Proved Reserves Multiples (Bcfe) 0.7x-0.7x 0.7x PV-10 Multiples (x) 0.3x-0.4x 0.3x 166,946 Discounted Cash Flow Discount Rate (%) 8.0%-17.1% 16.5% 7,121 Option Valuation Model Volatility (%) 55.0%-65.0% 60.0% 13,231 Other (2) Total $ 839,480 Type of Investment Fair Value at December 31, 2022 Valuation Technique (1) Unobservable Input Range Weighted Senior Secured Loans—First Lien $ 413,268 Market Comparables Market Yield (%) 8.5%-21.8% 12.3% EBITDA Multiples (x) 5.0x-7.5x 6.3x 29,977 Discounted Cash Flow Discount Rate (%) 11.5%-19.5% 15.4% Senior Secured Loans—Second Lien 143,270 Market Comparables Market Yield (%) 10.3%-14.3% 11.8% Senior Secured Bonds 10,074 Market Comparables Market Yield (%) 6.9%-7.9% 7.4% Unsecured Debt 19,256 Market Comparables Market Yield (%) 10.3%-11.3% 10.8% 35,118 Other (2) Preferred Equity 316,767 Market Comparables Market Yield (%) 8.8%-30.3% 19.0% EBITDA Multiples (x) 9.5x-10.5x 10.0x Net Aircraft Book Value Multiple (x) 1.0x-1.0x 1.0x 83,647 Discounted Cash Flow Discount Rate (%) 11.3%-12.3% 11.8% Sustainable Infrastructure Investments, LLC 51,098 Discounted Cash Flow Discount Rate (%) 13.5%-14.5% 14.0% Equity/Other 481,623 Market Comparables EBITDA Multiples (x) 1.8x-10.5x 5.4x Production Multiples (Mboe/d) $27,946.0-$37,500.0 $30,265.3 Proved Reserves Multiples (Mmboe) $6.9-$10.3 $7.6 Production Multiples (MMcfe/d) $3,400.0-$3,700.0 $3,550.0 Proved Reserves Multiples (Bcfe) 0.8x-0.9x 0.8x PV-10 Multiples (x) 0.5x-0.9x 0.8x 2,488 Discounted Cash Flow Discount Rate (%) 8.0%-33.0% 23.8% 5,734 Option Valuation Model Volatility (%) 31.5%-55.1% 36.6% 1,885 Other (2) Total $ 1,594,205 ________________________ (1) For investments utilizing a market comparables valuation technique, a significant increase (decrease) in the market yield, in isolation, would result in a significantly lower (higher) fair value measurement, and a significant increase (decrease) in any of the valuation multiples, in isolation, would result in a significantly higher (lower) fair value measurement. For investments utilizing a discounted cash flow valuation technique, a significant increase (decrease) in the discount rate, in isolation, would result in a significantly lower (higher) fair value measurement. For investments utilizing an option valuation model valuation technique, a significant increase (decrease) in the volatility, in isolation, would result in a significantly higher (lower) fair value measurement. (2) Fair valued based on expected outcome of proposed corporate transactions, the expected value of the liquidation preference of the investment or other factors.

Financing Arrangements

Financing Arrangements	12 Months Ended
Financing Arrangements	Dec. 31, 2023
Debt Disclosure [Abstract]
Financing Arrangements	Financing Arrangements The following tables present a summary of information with respect to the Company’s outstanding financing arrangements as of December 31, 2023 and 2022: As of December 31, 2023 Arrangement (1) Type of Arrangement Rate (2) Amount Amount Maturity Date Barclays Facility Repurchase Term SOFR+3.00% $ 400,000 $ 100,000 September 6, 2026 Total $ 400,000 $ 100,000 As of December 31, 2022 Arrangement (1) Type of Arrangement Rate (4) Amount Amount Maturity Date JPMorgan Facility Term Loan L+3.00% $ 305,676 $ — February 16, 2023 (5) Senior Secured Notes (3) Bond 7.50% 457,075 — August 15, 2023 (6) Total $ 762,751 $ — ________________________ (1) The carrying amount outstanding under the facility approximates its fair value, unless otherwise noted. (2) The financing fee under the Barclays Facility is based on three-month term SOFR (with a floor of 0.00%) plus a facility margin calculated monthly as the weighted average of the individual margin of the collateral obligations (subject to a floor, in the aggregate, of 3.00% ) . (3) As of December 31, 2022, the fair value of the Senior Secured Notes was approximately $458,908. This valuation is considered a Level 2 valuation within the fair value hierarchy. (4) LIBOR was subject to a 0.00% floor. (5) On February 14, 2023, the Company repaid and terminated the JPMorgan Facility. (6) On May 15, 2023, the Company redeemed 100% of the issued and outstanding Senior Secured Notes at a price equal to 100% of the aggregate principal amount, plus the accrued but unpaid interest through to, but excluding, May 15, 2023. For the years ended December 31, 2023, 2022 and 2021, the components of total interest expense for the Company’s financing arrangements were as follows: Year Ended December 31, 2023 2022 2021 Arrangement (1) Direct Interest Expense (2) Amortization of Deferred Financing Costs and Discount Total Interest Expense Direct Interest Expense (2) Amortization of Deferred Financing Costs and Discount Total Interest Expense Direct Interest Expense (2) Amortization of Deferred Financing Costs and Discount Total Interest Expense Barclays Facility $ 4,734 $ 636 $ 5,370 $ — $ — $ — $ — $ — $ — JPMorgan Facility (3) 2,790 238 3,028 14,670 1,798 16,468 9,623 3,780 13,403 Senior Secured Notes (4) 12,760 2,540 15,300 34,951 4,297 39,248 36,675 4,044 40,719 Total $ 20,284 $ 3,414 $ 23,698 $ 49,621 $ 6,095 $ 55,716 $ 46,298 $ 7,824 $ 54,122 _________________________ (1) Borrowings of each of the Company's wholly-owned special-purpose financing subsidiaries are considered borrowings of the Company for purposes of complying with the asset coverage requirements applicable to BDCs under the 1940 Act. (2) Direct interest expense includes the effect of non-usage fees, administration fees and make-whole fees, if any. (3) On February 14, 2023, the Company repaid and terminated the JPMorgan Facility. (4) On May 15, 2023, the Company redeemed 100% of the issued and outstanding Senior Secured Notes at a price equal to 100% of the aggregate principal amount, plus the accrued but unpaid interest through to, but excluding, May 15, 2023. The Company’s average borrowings and weighted average interest rate for the period from January 1, 2023 to May 15, 2023, the date on which the Company redeemed 100% of the issued and outstanding Senior Secured Notes, were $557,446 and 7.49%, respectively. The Company had no outstanding borrowings during the period from May 15, 2023 to September 5, 2023. The Company’s average borrowings and weighted average interest rate, including the effect of non-usage fees, for the period from September 6, 2023 (the date on which the Company entered into the Barclays Facility) to December 31, 2023, were $151,111 and 9.64%, respectively. As of December 31, 2023, the Company’s effective interest rate on borrowings, including the effect of non-usage fees, was 8.78%. The Company’s average borrowings and weighted average interest rate, including the effect of non-usage fees, for the year ended December 31, 2022 were $768,752 and 7.25%, respectively. As of December 31, 2022, the Company’s effective interest rate on borrowings was 7.47%. Under its financing arrangements, the Company made certain representations and warranties and was required to comply with various covenants, reporting requirements and other customary requirements for similar financing arrangements. The Company was in compliance with all covenants required by its financing arrangements as of December 31, 2023 and 2022. Barclays Facility On September 6, 2023, the Company, through two wholly-owned, special purpose financing subsidiaries, FSSL Finance BB AssetCo LLC, or FSSL Finance BB AssetCo, and FSSL Finance BB Seller LLC, or FSSL Finance BB Seller, entered into a financing arrangement with Barclays Bank PLC, or Barclays, pursuant to which up to $500,000 will be made available to fund investments in loans and other corporate securities, or together, the Collateral Obligations, and for other general corporate purposes, or the Barclays Facility. The financing fee under the Barclays Facility is based on three-month term SOFR (with a floor of 0.00%) plus a facility margin calculated monthly as the weighted average of the individual margin of the Collateral Obligations (such individual margins ranging from 1.90% to 4.20%, depending on the type of Collateral Obligations; subject to a floor, in the aggregate, of 3.00%). Pursuant to the financing arrangement, the Company may contribute Collateral Obligations from time to time to FSSL Finance BB AssetCo, pursuant to a Sale and Contribution Agreement, dated as of September 6, 2023, between the Company and FSSL Finance BB AssetCo, or the Sale and Contribution Agreement. The assets held by FSSL Finance BB AssetCo secure the obligations of FSSL Finance BB AssetCo under the notes, or the Notes, issued by FSSL Finance BB AssetCo to FSSL Finance BB Seller, pursuant to an indenture, dated as of September 6, 2023, with Computershare Trust Company, N.A., or Computershare, as trustee, or the Indenture. Principal on the Notes will be due and payable on the stated maturity date of July 1, 2033, and the Notes do not bear interest. Pursuant to the Indenture, FSSL Finance BB AssetCo has made certain representations and warranties and is required to comply with various covenants, reporting requirements and other customary requirements for similar transactions. The Indenture contains events of default customary for similar transactions, including, without limitation: (a) failure to make principal payments on the Notes at their stated maturity or any earlier redemption date or to make interest payments on the Notes; (b) failure to disburse amounts in accordance with the priority of payments; (c) occurrence of certain bankruptcy and insolvency events with respect to FSSL Finance BB AssetCo; and (d) occurrence of a Repurchase Date under the Repurchase Agreement (defined below) as a result of an event of default with respect to FSSL Finance BB Seller. FSSL Finance BB Seller acquired and subscribed for the Notes pursuant to a Subscription Agreement, dated as of September 6, 2023, between FSSL Finance BB AssetCo and FSSL Finance BB Seller as the investor. On September 6, 2023, FSSL Finance BB Seller entered into a Master Confirmation in respect of Repurchase Transactions with Barclays, or the Confirmation, which supplements and is subject to the Master Repurchase Agreement, dated as of September 6, 2023, between FSSL Finance BB Seller and Barclays, or the Master Repurchase Agreement, and such Master Repurchase Agreement, as supplemented and evidenced by the Confirmation, or the Repurchase Agreement. Pursuant to the Repurchase Agreement, on one or more occasions beginning September 6, 2023, Barclays began purchasing Notes held by FSSL Finance BB Seller for an aggregate purchase price of $400,000 outstanding as of December 31, 2023, which price may, subject to satisfaction of certain conditions, increase from time to time up to the maximum aggregate purchase price of $500,000. The scheduled Repurchase Date is September 6, 2026. Pursuant to the Repurchase Agreement, FSSL Finance BB Seller has made certain representations and warranties and is required to comply with various covenants, reporting requirements and other customary requirements for similar transactions. The Repurchase Agreement contains events of default customary for similar financing transactions, including, without limitation: (a) failure to pay the repurchase price upon the applicable payment dates; (b) failure to pay the financing fees and make-whole amounts when due; (c) failure to post collateral as required; (d) occurrence of an event of default under the Indenture, (e) occurrence of insolvency events with respect to FSSL Finance BB Seller; (f) cross default by the Company with respect to its indebtedness above a certain threshold amount and (g) financial covenant breach by the Company. As of December 31, 2023, Notes in an aggregate principal amount of $400,000 had been purchased by FSSL Finance BB Seller from FSSL Finance BB AssetCo and subsequently sold to Barclays under the Barclays Facility for aggregate proceeds of $394,437. The carrying amount outstanding under the Barclays Facility approximates its fair value. The Company funded the purchase of Notes by FSSL Finance BB Seller through a capital contribution to FSSL Finance BB Seller. The Notes issued by FSSL Finance BB AssetCo and purchased by FSSL Finance BB Seller eliminate in consolidation on the Company's financial statements. The Company incurred costs of $6,199 in connection with obtaining the Barclays Facility, which the Company has recorded as deferred financing costs on its consolidated balance sheet and amortizes to interest expense over the life of the Barclays Facility. As of December 31, 2023, $5,563 of such deferred financing costs had yet to be amortized to interest expense. JPMorgan Facility On August 16, 2018, the Company entered into that certain Senior Secured Credit Agreement, by and among the Company, the lenders party thereto, JPMorgan Chase Bank, N.A., or JPMorgan, as administrative agent and collateral agent, and the other parties signatory thereto, or as amended, the JPMorgan Facility. On February 14, 2023, the Company repaid and terminated the JPMorgan Facility. Prior to the termination of the JPMorgan Facility, $305,676 aggregate principal amount of loans were outstanding to the Company and such loans accrued interest at a rate equal to LIBOR (subject to a 0.00% floor) plus 3.00% per annum. The Company incurred certain customary costs and expenses in connection with the termination of the JPMorgan Facility. 7.500% Senior Secured Notes due 2023 On August 16, 2018, the Company, U.S. Bank National Association, or U.S Bank, as trustee, and certain subsidiaries of the Company, entered into an Indenture relating to the Company’s issuance of $500,000 aggregate principal amount of its 7.500% Senior Secured Notes due 2023, or the Senior Secured Notes. On May 15, 2023, the Company redeemed 100% of the issued and outstanding Senior Secured Notes at a price equal to 100% of the aggregate principal amount, plus the accrued but unpaid interest through to, but excluding, May 15, 2023. The Company incurred certain customary costs and expenses in connection with the redemption of the Senior Secured Notes.

Commitment and Contingencies

Commitment and Contingencies	12 Months Ended
Commitment and Contingencies	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company enters into contracts that contain a variety of indemnification provisions. The Company’s maximum exposure under these arrangements is unknown; however, the Company has not had prior claims or losses pursuant to these contracts. FS/EIG Advisor has reviewed the Company’s existing contracts and expects the risk of loss to the Company to be remote. The Company is not currently subject to any material legal proceedings and, to the Company’s knowledge, no material legal proceedings are threatened against the Company. From time to time, the Company may be a party to certain legal proceedings in the ordinary course of business, including proceedings relating to the enforcement of the Company’s rights under contracts with its portfolio companies. While the outcome of any legal proceedings cannot be predicted with certainty, the Company does not expect that any such proceedings will have a material effect upon its financial condition or results of operations. See Note 4 for a discussion of the Company’s commitments to FS/EIG Advisor and its affiliates (including FS Investments) and Note 7 for a discussion of the Company’s unfunded commitments.

Senior Securities Asset Coverag

Senior Securities Asset Coverage	12 Months Ended
Senior Securities Asset Coverage	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Senior Securities Asset Coverage	Senior Securities Asset Coverage Information about the Company's senior securities is shown in the table below as of December 31, 2023, 2022, 2021, 2020 and 2019: As of December 31, Total Amount Outstanding Exclusive of Treasury Securities Asset Coverage Per Unit (1) Involuntary Liquidation Preference per Unit (2) Average Market Value per Unit (Exclude Bank Loans) (3) 2019 $ 1,236,667 $ 2,924 — N/A 2020 $ 905,667 $ 2,577 — N/A 2021 $ 775,667 $ 3,066 — N/A 2022 $ 762,751 $ 3,299 — N/A 2023 $ 400,000 $ 4,905 — N/A _________________________ (1) Asset coverage per unit is the ratio of the carrying value of the Company’s total consolidated assets, less all liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness. Asset coverage per unit is expressed in terms of dollar amounts per $1,000 of indebtedness. All prior period ratios have been updated to conform with this current presentation. (2) The amount to which such class of senior security would be entitled upon the voluntary liquidation of the Company in preference to any security junior to it. The “ — ” in this column indicates that the SEC expressly does not require this information to be disclosed for certain types of senior securities. (3) Not applicable because senior securities are not registered for public trading on an exchange.

Financial Highlights

Financial Highlights	12 Months Ended
Financial Highlights	Dec. 31, 2023
Investment Company [Abstract]
Financial Highlights	Financial Highlights The following is a schedule of financial highlights of the Company for the years ended December 31, 2023, 2022, 2021, 2020 and 2019: Year Ended December 31, 2023 2022 2021 2020 2019 Per Share Data: (1) Net asset value, beginning of year $ 3.88 $ 3.59 $ 3.25 $ 5.43 $ 6.01 Results of operations (2) Net investment income 0.18 0.16 0.09 0.19 0.46 Net realized gain (loss) and unrealized appreciation (depreciation) (0.44) 0.25 0.37 (2.20) (0.54) Net increase (decrease) in net assets resulting from operations (0.26) 0.41 0.46 (2.01) (0.08) Shareholder distributions (3) Distributions from net investment income (0.19) (0.12) (0.12) (0.14) (0.50) Distributions representing return of capital — — — (0.03) — Net decrease in net assets resulting from shareholder distributions (0.19) (0.12) (0.12) (0.17) (0.50) Capital share transactions Issuance of common shares (4) — — — — — Net increase (decrease) in net assets resulting from capital share transactions — — — — — Net asset value, end of year $ 3.43 $ 3.88 $ 3.59 $ 3.25 $ 5.43 Shares outstanding, end of year 455,506,155 451,465,673 446,089,499 440,020,123 438,477,007 Total return (5) (6.89) % 11.39 % 14.22 % (37.68) % (1.83) % Total return (without assuming reinvestment of distributions) (5) (6.70) % 11.29 % 14.15 % (37.02) % (1.33) % Ratio/Supplemental Data: Net assets, end of year $ 1,562,055 $ 1,753,748 $ 1,602,323 $ 1,428,577 $ 2,379,605 Ratio of net investment income to average net assets (6)(7) 4.77 % 4.02 % 2.77 % 4.82 % 7.76 % Ratio of total operating expenses to average net assets (6) 4.50 % 6.78 % 6.96 % 8.20 % 6.54 % Ratio of management fee offset to average net assets (6) (0.02) % (0.15) % (0.09) % (0.04) % (0.23) % Ratio of net operating expenses to average net assets (6) 4.48 % 6.63 % 6.87 % 8.16 % 6.31 % Ratio of interest expense to average net assets (6) 1.39 % 3.21 % 3.46 % 4.39 % 3.40 % Ratio of federal and state taxes to average net assets (6) 0.15 % 0.13 % — — — Portfolio turnover 45.84 % 16.15 % 44.25 % 26.54 % 32.88 % Total amount of senior securities outstanding, exclusive of treasury securities $ 400,000 $ 762,751 $ 775,667 $ 905,667 $ 1,236,667 Asset coverage per unit (8) $ 4,905 $ 3,299 $ 3,066 $ 2,577 $ 2,924 Asset coverage ratio (8) 4.91 3.30 3.07 2.58 2.92 _________________________ (1) Per share data may be rounded in order to recompute the ending net asset value per share. (2) The per share data was derived by using the weighted average shares outstanding during the applicable year. (3) The per share data for distributions reflects the actual amount of distributions paid per share during the applicable year. (4) The issuance of common shares on a per share basis reflects the incremental net asset value changes as a result of the issuance of common shares pursuant to the Company’s distribution reinvestment plan. The issuance of common shares at a price that is greater than the net asset value per share results in an increase in net asset value per share. (5) The total return for each year presented was calculated based on the change in net asset value during the applicable year, including the impact of distributions reinvested in accordance with the Company’s distribution reinvestment plan. Following the termination of the Company’s distribution reinvestment plan effective September 15, 2023, the total return for each year presented subsequent to the effective date was calculated based on the change in net asset value during the applicable year, assuming the reinvestment of all distributions at the Company’s net asset value per share as of the end of the applicable period. The total return (without assuming reinvestment of distributions) for each year presented was calculated by taking the net asset value per share as of the end of the applicable year, adding the cash distributions per share which were declared during the applicable year and dividing the total by the net asset value per share at the beginning of the applicable year. The total returns do not consider the effect of any sales commissions or charges that may be incurred in connection with the sale of the Company’s common shares. The total returns include the effect of the issuance of common shares at a net offering price that is greater than net asset value per share, which causes an increase in net asset value per share. The historical calculations of total returns in the table should not be considered representations of the Company’s future total returns, which may be greater or less than the returns shown in the table due to a number of factors, including the Company’s ability or inability to make investments in companies that meet its investment criteria, the interest rates payable on the debt securities the Company acquires, the level of the Company’s expenses, variations in and the timing of the recognition of realized and unrealized gains or losses, the degree to which the Company encounters competition in its markets and general economic conditions. As a result of these factors, results for any previous year should not be relied upon as being indicative of performance in future years. The total return calculations set forth above represent the total returns on the Company’s investment portfolio during the applicable year and do not represent actual returns to shareholders. (6) Weighted average net assets during the applicable years are used for this calculation. (7) If FS/EIG Advisor had not agreed to offset the amount of any structuring, upfront or certain other fees it or its members received against the management fee payable by the Company, the ratio of net investment income to average net assets would have been 4.75%, 3.87%, 2.68%, 4.78% and 7.53% for the years ended December 31, 2023, 2022, 2021, 2020 and 2019, respectively. See Note 4 for a discussion of the management fee offset with FS/EIG Advisor. (8) Asset coverage per unit is the ratio of the carrying value of the Company's total consolidated assets, less liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness. Asset coverage per unit is expressed in terms of dollar amounts per $1,000 of indebtedness. All prior period ratios have been updated to conform with this current presentation.

Selected Quarterly Financial Da

Selected Quarterly Financial Data (Unaudited)	12 Months Ended
Selected Quarterly Financial Data (Unaudited)	Dec. 31, 2023
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Data (Unaudited)	Selected Quarterly Financial Data (Unaudited) The following is the quarterly results of operations for the years ended December 31, 2023 and 2022. The following information reflects all normal recurring adjustments necessary for a fair presentation of the information for the periods presented. The operating results for any quarter are not necessarily indicative of results for any future period. Quarter Ended December 31, 2023 September 30, 2023 June 30, 2023 March 31, 2023 Investment income $ 42,708 $ 30,443 $ 41,476 $ 43,095 Operating expenses Total expenses and federal and state taxes 17,125 13,788 19,594 26,193 Less: Management fee offset (4) (63) (19) (255) Net expenses and federal and state taxes 17,121 13,725 19,575 25,938 Net investment income 25,587 16,718 21,901 17,157 Realized and unrealized gain (loss) (62,142) (44,141) (46,552) (49,711) Net increase (decrease) in net assets resulting from operations $ (36,555) $ (27,423) $ (24,651) $ (32,554) Per share information—basic and diluted Net investment income $ 0.05 $ 0.04 $ 0.05 $ 0.04 Net increase (decrease) in net assets resulting from operations $ (0.08) $ (0.06) $ (0.05) $ (0.07) Weighted average shares outstanding 455,506,174 455,401,486 454,041,028 452,684,238 Quarter Ended December 31, 2022 September 30, 2022 June 30, 2022 March 31, 2022 Investment income $ 59,535 $ 42,450 $ 47,073 $ 35,909 Operating expenses Total expenses and federal income and excise taxes 32,157 29,306 27,937 28,417 Less: Management fee offset (13) (208) (1,700) (698) Net expenses and federal income and excise taxes 32,144 29,098 26,237 27,719 Net investment income 27,391 13,352 20,836 8,190 Realized and unrealized gain (loss) 2,849 (64,453) (5,256) 181,593 Net increase (decrease) in net assets resulting from operations $ 30,240 $ (51,101) $ 15,580 $ 189,783 Per share information—basic and diluted Net investment income $ 0.06 $ 0.03 $ 0.05 $ 0.02 Net increase (decrease) in net assets resulting from operations $ 0.07 $ (0.11) $ 0.03 $ 0.42 Weighted average shares outstanding 451,364,025 450,023,829 448,730,149 447,404,395 The sum of quarterly per share amounts does not necessarily equal per share amounts reported for the years ended December 31, 2023 and 2022. This is due to changes in the number of weighted average shares outstanding and the effects of rounding for each period. For the year ended December 31, 2023 , 93.3% of distributions qualified as excess interest income for purposes of Internal Revenue Code Section 163(j).

Subsequent Events

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events BNP Paribas Total Return Swap On February 15, 2024, FSSL Finance BNPP TRS LLC, or FSSL Finance BNPP TRS, a wholly-owned financing subsidiary of the Company, entered into a loan TRS with BNP Paribas, or BNPP. The TRS with BNPP enables the Company, through its ownership of FSSL Finance BNPP TRS, to obtain the economic benefit of owning the broadly syndicated loans subject to the TRS, without actually owning them, in return for an interest-type payment to BNPP. As such, the TRS is analogous to the Company borrowing funds to acquire loans and incurring interest expense to a lender. The terms of the TRS with BNPP include, among other things, (a) payment by BNPP to FSSL Finance BNPP TRS of all interest and fees (less applicable withholding taxes) on the underlying loans, (b) payment by FSSL Finance BNPP TRS to BNPP of (i) a financing fee on the outstanding notional amount of the TRS at a rate equal to USD-SOFR Compounded Index plus 1.65% per annum, and (ii) a utilization fee of 0.85% per annum on the difference between any lesser usage amount and a $100,000 minimum usage threshold, (c) upon the termination or repayment of any loan subject to the TRS, FSSL Finance BNPP TRS either will receive from BNPP the appreciation in the value of such loan or will pay to BNPP any depreciation in the value of such loan and (d) guarantee by the Company of all obligations of FSSL Finance BNPP TRS.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net increase (decrease) in net assets resulting from operations	$ (36,555)	$ (27,423)	$ (24,651)	$ (32,554)	$ 30,240	$ (51,101)	$ 15,580	$ 189,783	$ (121,183)	$ 184,502	$ 205,875

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

N-2

N-2 - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
N-2 - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cover [Abstract]
Entity Central Index Key	0001501729
Amendment Flag	false
Securities Act File Number	814-00841
Document Type	10-K
Entity Registrant Name	FS Specialty Lending Fund
Entity Address, Address Line One	201 Rouse Boulevard
Entity Address, City or Town	Philadelphia
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19112
City Area Code	215
Local Phone Number	495-1150
Entity Well-known Seasoned Issuer	No
Entity Emerging Growth Company	false
Financial Highlights [Abstract]
Senior Securities [Table Text Block]	Information about the Company's senior securities is shown in the table below as of December 31, 2023, 2022, 2021, 2020 and 2019: As of December 31, Total Amount Outstanding Exclusive of Treasury Securities Asset Coverage Per Unit (1) Involuntary Liquidation Preference per Unit (2) Average Market Value per Unit (Exclude Bank Loans) (3) 2019 $ 1,236,667 $ 2,924 — N/A 2020 $ 905,667 $ 2,577 — N/A 2021 $ 775,667 $ 3,066 — N/A 2022 $ 762,751 $ 3,299 — N/A 2023 $ 400,000 $ 4,905 — N/A _________________________ (1) Asset coverage per unit is the ratio of the carrying value of the Company’s total consolidated assets, less all liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness. Asset coverage per unit is expressed in terms of dollar amounts per $1,000 of indebtedness. All prior period ratios have been updated to conform with this current presentation. (2) The amount to which such class of senior security would be entitled upon the voluntary liquidation of the Company in preference to any security junior to it. The “ — ” in this column indicates that the SEC expressly does not require this information to be disclosed for certain types of senior securities. (3) Not applicable because senior securities are not registered for public trading on an exchange.
Senior Securities Amount	$ 400,000	$ 762,751	$ 775,667	$ 905,667	$ 1,236,667
Senior Securities Coverage per Unit	$ 4,905	$ 3,299	$ 3,066	$ 2,577	$ 2,924
Senior Securities, Note [Text Block]	Senior Securities Asset Coverage Information about the Company's senior securities is shown in the table below as of December 31, 2023, 2022, 2021, 2020 and 2019: As of December 31, Total Amount Outstanding Exclusive of Treasury Securities Asset Coverage Per Unit (1) Involuntary Liquidation Preference per Unit (2) Average Market Value per Unit (Exclude Bank Loans) (3) 2019 $ 1,236,667 $ 2,924 — N/A 2020 $ 905,667 $ 2,577 — N/A 2021 $ 775,667 $ 3,066 — N/A 2022 $ 762,751 $ 3,299 — N/A 2023 $ 400,000 $ 4,905 — N/A _________________________ (1) Asset coverage per unit is the ratio of the carrying value of the Company’s total consolidated assets, less all liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness. Asset coverage per unit is expressed in terms of dollar amounts per $1,000 of indebtedness. All prior period ratios have been updated to conform with this current presentation. (2) The amount to which such class of senior security would be entitled upon the voluntary liquidation of the Company in preference to any security junior to it. The “ — ” in this column indicates that the SEC expressly does not require this information to be disclosed for certain types of senior securities. (3) Not applicable because senior securities are not registered for public trading on an exchange.
Senior Securities Averaging Method, Note [Text Block]	Not applicable because senior securities are not registered for public trading on an exchange.
Senior Securities Headings, Note [Text Block]	Asset coverage per unit is the ratio of the carrying value of the Company’s total consolidated assets, less all liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness. Asset coverage per unit is expressed in terms of dollar amounts per $1,000 of indebtedness. All prior period ratios have been updated to conform with this current presentation.The amount to which such class of senior security would be entitled upon the voluntary liquidation of the Company in preference to any security junior to it. The “ — ” in this column indicates that the SEC expressly does not require this information to be disclosed for certain types of senior securities.
General Description of Registrant [Abstract]
NAV Per Share	$ 3.43	$ 3.88	$ 3.59	$ 3.25	$ 5.43	$ 6.01

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation: The accompanying audited consolidated financial statements of the Company have been prepared in accordance with U.S. generally accepted accounting principles, or GAAP. The Company is considered an investment company under GAAP and follows the accounting and reporting guidance applicable to investment companies under Accounting Standards Codification Topic 946, Financial Services—Investment Companies . The Company has evaluated the impact of subsequent events through the date the consolidated financial statements were issued and filed with the Securities and Exchange Commission, or the SEC.
Use of Estimates	Use of Estimates: The preparation of the audited consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Many of the amounts have been rounded, and all amounts are in thousands, except share and per share amounts.
Cash and Cash Equivalents	Cash and Cash Equivalents: The Company considers all highly liquid investments with original maturities of three months or less to be cash equivalents. The Company may invest its cash in a money market fund, which is stated at fair value. The Company's cash and cash equivalents are maintained with high credit quality financial institutions, which are members of the Federal Deposit Insurance Corporation.
Valuation of Portfolio Investments	Valuation of Portfolio Investments: The Company’s board of trustees is responsible for overseeing the valuation of the Company’s portfolio investments at fair value as determined in good faith pursuant to FS/EIG Advisor’s valuation policy. As permitted by Rule 2a-5 of the 1940 Act, the Company’s board of trustees has designated FS/EIG Advisor as the Company’s valuation designee, with day-to-day responsibility for implementing the portfolio valuation process set forth in FS/EIG Advisor’s valuation policy. Accounting Standards Codification Topic 820, Fair Value Measurements and Disclosure , or ASC Topic 820, issued by the FASB clarifies the definition of fair value and requires companies to expand their disclosure about the use of fair value to measure assets and liabilities in interim and annual periods subsequent to initial recognition. ASC Topic 820 defines fair value as the price that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC Topic 820 also establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets for identical securities; Level 2, which includes inputs such as quoted prices for similar securities in active markets and quoted prices for identical securities where there is little or no activity in the market; and Level 3, defined as unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions. FS/EIG Advisor determines the fair value of the Company’s investment portfolio each quarter. Securities that are publicly-traded with readily available market prices will be valued at the reported closing price on the valuation date. Securities that are not publicly-traded with readily available market prices will be valued at fair value as determined in good faith by FS/EIG Advisor. In connection with that determination, FS/EIG Advisor will prepare portfolio company valuations which are based on relevant inputs, including, but not limited to, indicative dealer quotes, values of like securities, recent portfolio company financial statements and forecasts, and valuations prepared by independent third-party pricing and valuation services. With respect to investments for which market quotations are not readily available, a multi-step valuation process is undertaken each quarter, as described below: • the quarterly fair valuation process begins with FS/EIG Advisor facilitating the delivery of updated quarterly financial and other information relating to each investment to an independent third-party pricing or valuation service; • the independent third-party pricing or valuation service then reviews and analyzes the information, along with relevant market and economic data, and determines proposed valuations for each portfolio company or investment according to the valuation methodologies in FS/EIG Advisor’s valuation policy and communicates the information to FS/EIG Advisor in the form of a valuation range for Level 2 and Level 3 assets; • FS/EIG Advisor then reviews the preliminary valuation information for each portfolio company or investment and provides feedback about the accuracy, completeness and timeliness of the valuation-related inputs considered by the independent third-party pricing or valuation service and any suggested revisions thereto prior to the independent third-party pricing or valuation service finalizing its valuation range; • FS/EIG Advisor then provides the valuation committee with its valuation determinations and valuation-related information for each portfolio company or investment, along with any applicable supporting materials; and other information that is relevant to the fair valuation process; • the valuation committee meets with FS/EIG Advisor to receive the relevant quarterly reporting from FS/EIG Advisor and to discuss any questions from the valuation committee in connection with the valuation committee’s role in overseeing the fair valuation process; and • following the completion of its fair value oversight activities, the valuation committee (with the assistance of FS/EIG Advisor) provides the Company's board of trustees with a report regarding the quarterly valuation process. Determination of fair value involves subjective judgments and estimates. Accordingly, the notes to the Company's consolidated financial statements refer to the uncertainty with respect to the possible effect of such valuations and any change in such valuations on the Company's consolidated financial statements. In making its determination of fair value, FS/EIG Advisor may use any independent third-party pricing or valuation services for which it has performed the appropriate level of due diligence. However, FS/EIG Advisor is not required to determine fair value in accordance with the valuation provided by any single source, and may use any relevant data, including information sourced by FS/EIG Advisor or provided by any independent third-party pricing or valuation service that FS/EIG Advisor deems to be reliable in determining fair value under the circumstances. Below is a description of factors that FS/EIG Advisor and any independent third-party valuation services may consider when determining the fair value of the Company's investments. The valuation methods utilized for each portfolio company may vary depending on industry and company-specific considerations. Typically, the first step is to make an assessment as to the enterprise value of the portfolio company’s business in order to establish whether the portfolio company’s enterprise value is greater than the amount of its debt as of the valuation date. This analysis helps to determine a risk profile for the applicable portfolio company and its related investments, and the appropriate valuation methodology to utilize as part of the security valuation analysis. The enterprise valuation may be determined using a market or income approach. Valuation of fixed income investments, such as loans and debt securities, depends upon a number of factors, including prevailing interest rates for like securities, expected volatility in future interest rates, call features, put features and other relevant terms of the debt. For investments without readily available market prices, FS/EIG Advisor may incorporate these factors into discounted cash flow models to arrive at fair value. Various methods may be used to determine the appropriate discount rate in a discounted cash flow model. Other factors that may be considered include the borrower’s ability to adequately service its debt, the fair market value of the borrower in relation to the face amount of its outstanding debt and the quality of collateral securing the debt investments. For convertible debt securities, fair value generally approximates the fair value of the debt plus the fair value of an option to purchase the underlying security (i.e., the security into which the debt may convert) at the conversion price. To value such an option, a standard option pricing model may be used. The Company's equity interests in portfolio companies for which there is no liquid public market are valued at fair value. Generally, the value of the Company's equity interests in public companies for which market quotations are readily available is based upon the most recent closing public market price. When the Company receives warrants or other equity securities at nominal or no additional cost in connection with an investment in a debt security, the cost basis in the investment will be allocated between the debt securities and any such warrants or other equity securities received at the time of origination. FS/EIG Advisor subsequently values these warrants or other equity securities received at their fair value. Swap contracts typically are valued at their daily prices obtained from an independent third party. The aggregate settlement values and notional amounts of the swap contracts are not recorded in the consolidated financial statements. Fluctuations in the value of the swap contracts are recorded in the consolidated balance sheets as gross assets and gross liabilities and in the statements of operations as unrealized appreciation (depreciation) until closed, when they are recorded as net realized gain (loss).
Revenue Recognition	Revenue Recognition: Security transactions are accounted for on the trade date. The Company records interest income on an accrual basis to the extent that it expects to collect such amounts. The Company records dividend income on the ex-dividend date. Distributions received from limited liability company, or LLC, and limited partnership, or LP, investments are evaluated to determine if the distribution should be recorded as dividend income or a return of capital. The Company does not accrue as a receivable interest or dividends on loans and securities if it has reason to doubt its ability to collect such income. The Company's policy is to place investments on non-accrual status when there is reasonable doubt that interest income will be collected. The Company considers many factors relevant to an investment when placing it on or removing it from non-accrual status including, but not limited to, the delinquency status of the investment, economic and business conditions, the overall financial condition of the underlying investment, the value of the underlying collateral, bankruptcy status, if any, and any other facts or circumstances relevant to the investment. If there is reasonable doubt that the Company will receive any previously accrued interest, then the accrued interest will be written-off. Payments received on non-accrual investments may be recognized as income or applied to principal depending upon the collectability of the remaining principal and interest. Non-accrual investments may be restored to accrual status when principal and interest become current and are likely to remain current based on the Company's judgment.
Net Realized Gains or Losses, Net Change in Unrealized Appreciation or Depreciation and Net Change in Unrealized Gains or Losses on Foreign Currency	Net Realized Gains or Losses, Net Change in Unrealized Appreciation or Depreciation and Net Change in Unrealized Gains or Losses on Foreign Currency: Gains or losses on the sale of investments are calculated by using the specific identification method. The Company measures realized gains or losses by the difference between the net proceeds from the repayment or sale and the amortized cost basis of the investment, without regard to unrealized appreciation or depreciation previously recognized, but considering unamortized fees. Net change in unrealized appreciation or depreciation reflects the change in portfolio investment values during the reporting period, including any reversal of previously recorded unrealized gains or losses when gains or losses are realized and the respective unrealized gain or loss on foreign currency for any foreign denominated investments it may hold. Net change in unrealized gains or losses on foreign currency reflects the change in the value of foreign currency held, receivables or accruals during the reporting period due to the impact of foreign currency fluctuations.
Capital Gains Incentive Fee and Subordinated Income Incentive Fee	Capital Gains Incentive Fee: Subordinated Income Incentive Fee: Pursuant to the terms of the FS/EIG investment advisory agreement, FS/EIG Advisor may also be entitled to receive a subordinated incentive fee on income. The subordinated incentive fee on income under the FS/EIG investment advisory agreement is calculated and payable quarterly in arrears and equals 20.0% of the Company’s “pre-incentive fee net investment income” for the immediately preceding quarter subject to a hurdle rate, expressed as a rate of return on adjusted capital, equal to 1.625% per quarter, or an annualized hurdle rate of 6.5%. As a result, FS/EIG Advisor will not earn this incentive fee for any quarter until the Company’s pre-incentive fee net investment income for such quarter exceeds the hurdle rate of 1.625%. For purposes of this fee, ‘‘adjusted capital’’ means cumulative gross proceeds generated from sales of the Company’s common shares (including proceeds from its distribution reinvestment plan) reduced for distributions from non-liquidating dispositions of the Company’s investments paid to shareholders and amounts paid for share repurchases pursuant to the Company’s share repurchase program. Once the Company’s pre-incentive fee net investment income in any quarter exceeds the hurdle rate, FS/EIG Advisor will be entitled to a “catch-up” fee equal to the amount of the Company’s pre-incentive fee net investment income in excess of the hurdle rate, until the Company’s pre-incentive fee net investment income for such quarter equals 2.031%, or 8.125% annually, of adjusted capital. This “catch-up” feature will allow FS/EIG Advisor to recoup the fees foregone as a result of the existence of the hurdle rate. Thereafter, FS/EIG Advisor will be entitled to receive 20.0% of the Company’s pre-incentive fee net investment income.
Fixed Price Swaps and Total Return Swaps	Fixed Price Swaps Total Return Swaps: The Company may enter into total return swaps to obtain exposure to a security or market without owning such security or investing directly in such market or to exchange the risk/return of one market with another market. Total return swaps are agreements in which there is an exchange of cash flows whereby one party agrees to make periodic payments based on the total return (distributions plus capital gains/losses) of an underlying instrument in exchange for fixed or floating rate interest payments. If the total return of the instrument or index underlying the transaction exceeds or falls short of the offsetting fixed or floating interest rate obligation, the Company receives payment from or makes a payment to the counterparty.
Income Taxes	Income Taxes:
Uncertainty in Income Taxes	Uncertainty in Income Taxes: The Company evaluates its tax positions to determine if the tax positions taken meet the minimum recognition threshold in connection with accounting for uncertainties in income tax positions taken or expected to be taken for the purposes of measuring and recognizing tax benefits or liabilities in the consolidated financial statements. Recognition of a tax benefit or liability with respect to an uncertain tax position is required only when the position is "more likely than not" to be sustained assuming examination by taxing authorities. The Company recognizes interest and penalties, if any, related to unrecognized tax liabilities as income tax expense in the consolidated statements of operations. During the years ended December 31, 2023, 2022 and 2021, the Company did not incur any interest or penalties. The Company has analyzed the tax positions taken on federal and state income tax returns for all open tax years, and has recorded a provision for taxes related to its wholly-owned taxable subsidiaries for the years ended December 31, 2023 and 2022 of $0 and $1,207, respectively. The Company's federal and state income and federal excise tax returns for tax years for which the applicable statutes of limitations have not expired are subject to examination by the Internal Revenue Service and state departments of revenue.
Distributions	Distributions: Distributions to the Company's shareholders are recorded as of the record date. Subject to the discretion of the Company's board of trustees and applicable legal restrictions, the Company expects to declare and pay enhanced cash distributions on a quarterly basis. Net realized capital gains, if any, are distributed or deemed distributed at least annually.
Reclassifications	Reclassifications: Certain amounts in the consolidated financial statements for the years ended December 31, 2022 and 2021 may have been reclassified to conform to the classifications used to prepare the consolidated financial statements for the year ended December 31, 2023.
Recent Accounting Pronouncements	Recent Accounting Pronouncements: In June 2022, the FASB issued Accounting Standards Update No. 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions , or ASU 2022-03, which clarifies guidance for fair value measurement of an equity security subject to a contractual sale restriction and establishes new disclosure requirements for such equity securities. ASU 2022-03 is effective for fiscal years beginning after December 15, 2023 and for interim periods within those fiscal years, with early adoption permitted. The Company has concluded that this guidance will not have a material impact on its consolidated financial statements.

Share Transactions (Tables)

Share Transactions (Tables)	12 Months Ended
Share Transactions (Tables)	Dec. 31, 2023
Equity [Abstract]
Schedule of Common Stock Transactions	Below is a summary of transactions with respect to the Company’s common shares during the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, 2023 2022 2021 Shares Amount Shares Amount Shares Amount Reinvestment of Distributions (1) 4,040,482 $ 15,549 5,376,174 $ 20,861 6,069,376 $ 21,135 Proceeds from Share Transactions 4,040,482 $ 15,549 5,376,174 $ 20,861 6,069,376 $ 21,135 ______________ (1) On September 15, 2023, the Company's second amended and restated distribution reinvestment plan terminated.

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
Related Party Transactions (Tables)	Dec. 31, 2023
Related Party Transactions [Abstract]
Schedule of the Fees and Expenses Accrued Under Investment Advisory Agreement	The following table describes the fees and expenses accrued under the FS/EIG investment advisory agreement during the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, Related Party Source Agreement Description 2023 2022 2021 FS/EIG Advisor FS/EIG investment advisory agreement Base Management Fee (1) $ 35,036 $ 41,940 $ 40,122 FS/EIG Advisor FS/EIG investment advisory agreement Administrative Services Expenses (2) $ 6,087 $ 5,626 $ 5,713 _________________________ (1) During the years ended December 31, 2023, 2022 and 2021, $37,805, $41,221 and $39,812, respectively, in base management fees were paid to FS/EIG Advisor. The base management fee amount shown in the table above for the years ended December 31, 2023, 2022 and 2021 is shown net of $341, $2,619 and $1,439, respectively, in structuring, upfront or certain other fees received by FS/EIG Advisor or its members and offset against base management fees. As of December 31, 2023, $8,416 in base management fees were payable to FS/EIG Advisor. (2) During the years ended December 31, 2023, 2022 and 2021, $4,431, $3,930 and $3,450, respectively, of the accrued administrative services expenses related to the allocation of costs of administrative personnel for services rendered to the Company by FS/EIG Advisor and the remainder related to other reimbursable expenses. The Company paid $6,469, $5,134 and $4,849 in administrative services expenses to FS/EIG Advisor, or its affiliates, during the years ended December 31, 2023, 2022 and 2021, respectively.

Distributions (Tables)

Distributions (Tables)	12 Months Ended
Distributions (Tables)	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of Cash Distributions Paid on Common Stock Including Tax Basis	The following table reflects the cash distributions per share that the Company has declared on its common shares during the years ended December 31, 2023, 2022 and 2021: Distribution For the Year Ended December 31, Per Share Amount 2021 $ 0.1200 $ 53,264 2022 $ 0.1200 $ 53,938 2023 $ 0.1892 $ 86,059 The following table reflects the sources of the cash distributions on a tax basis that the Company declared on its common shares during the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, 2023 2022 2021 Source of Distribution Distribution Amount Percentage Distribution Amount Percentage Distribution Amount Percentage Net investment income (1) $ 86,059 100 % $ 53,938 100 % $ 53,264 100 % Short-term capital gains proceeds from the sale of assets — — — — — — Long-term capital gains proceeds from the sale of assets — — — — — — Return of capital — — — — — — Total $ 86,059 100 % $ 53,938 100 % $ 53,264 100 % ______________________________ (1) During the years ended December 31, 2023, 2022 and 2021, 87.1%, 85.5% and 74.1%, respectively, of the Company's gross investment income was attributable to cash income earned, 9.0%, 10.8% and 18.5%, respectively, was attributable to paid-in-kind, or PIK, interest and 3.9%, 3.7% and 7.4%, respectively, was attributable to non-cash accretion of discount.
Schedule of Reconciliation Between GAAP-basis Net Investment Income and Tax-basis Net Investment Income	The following table sets forth a reconciliation between GAAP-basis net investment income and tax-basis net investment income during the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, 2023 2022 2021 GAAP-basis net investment income $ 81,363 $ 69,769 $ 43,259 Reclassification of unamortized original issue discount and prepayment fees (5,072) (12,480) (4,030) GAAP vs. tax-basis impact of consolidation of certain subsidiaries 2,652 1,242 13,532 Income subject to tax not recorded for GAAP (income recorded for GAAP not subject to tax) 22,612 13,036 28,182 Other miscellaneous differences 249 (1,856) (51) Tax-basis net investment income $ 101,804 $ 69,711 $ 80,892
Schedule of Accumulated Earnings on a Tax Basis	As of December 31, 2023 and 2022, the components of accumulated earnings on a tax basis were as follows: December 31, 2023 2022 Distributable ordinary income $ 36,369 $ 21,803 Accumulated capital losses (1) (1,595,362) (1,282,145) Other temporary differences (670) (83) Net unrealized appreciation (depreciation) on investments, swap contracts and foreign currency (2) (64,522) (177,571) Total $ (1,624,185) $ (1,437,996) ______________________________ (1) Net capital losses may be carried forward indefinitely, and their character is retained as short-term or long-term. As of December 31, 2023, the Company had short-term and long-term capital loss carryforwards available to offset future realized capital gains of $74,081 and $1,521,281, respectively. (2) As of December 31, 2023 and 2022, for federal income tax purposes, the gross unrealized appreciation on the Company's investments was $148,817 and $334,635, respectively, and the gross unrealized depreciation on the Company's investments, swap contracts and unrealized loss on foreign currency was $213,339 and $512,206, respectively.

Financial Instruments (Tables)

Financial Instruments (Tables)	12 Months Ended
Financial Instruments (Tables)	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Fair Value of Swap Contracts	The following table presents the fair value of swap contracts (which are not considered to be hedging instruments for accounting purposes) as of December 31, 2023 and 2022: December 31, 2023 December 31, 2022 Instrument Asset Liability Asset Liability (1) Commodity Fixed Price Swaps—Crude Oil $ — $ — $ — $ (572) Commodity Fixed Price Swaps—Natural Gas — — — (126) Equity Total Return Swaps — — — — Total $ — $ — $ — $ (698) ______________ (1) Reflected on the Company's consolidated balance sheets as: Unrealized depreciation on swap contracts.
Schedule of Realized and Unrealized Gain (Loss) on Derivative Instruments	The effect of swap contracts (which are not considered to be hedging instruments for accounting purposes) on the Company's statements of operations for the years ended December 31, 2023 and 2022 were as follows: Net Realized Gains (Losses) (1) Net Change in Unrealized Appreciation (Depreciation) (2) Year Ended December 31, Year Ended December 31, Instrument 2023 2022 2023 2022 Commodity Fixed Price Swaps—Crude Oil $ (363) $ (2,030) $ 572 $ (572) Commodity Fixed Price Swaps—Natural Gas 394 (755) 126 (126) Equity Total Return Swaps 1,017 — — — Total $ 1,048 $ (2,785) $ 698 $ (698) ______________ (1) Reflected on the Company's consolidated statements of operations as: Net realized gain (loss) on swap contracts. (2) Reflected on the Company's consolidated statements of operations as: Net change in unrealized appreciation (depreciation) on swap contracts.
Schedule of Offsetting Liabilities	The following table presents the Company’s derivative assets and liabilities by counterparty, net of amounts available for offset under a master netting agreement as of December 31, 2022: As of December 31, 2022 Counterparty Derivative Assets Derivative Liabilities Net Value of Derivatives Non-Cash Collateral (Received) Pledged (1) Cash Collateral (Received) Pledged (1) Net Amount of Derivative Assets (Liabilities) (2) BP Energy Co. — $ (698) $ (698) — — $ (698) ______________ (1) In some instances, the actual amount of the collateral received and/or pledged may be more than the amount shown due to overcollateralization. (2) Net amount of derivative assets and liabilities represents the net amount due from the counterparty to the Company and the net amount due from the Company to the counterparty, respectively, in the event of default.
Schedule of Offsetting Assets	The following table presents the Company’s derivative assets and liabilities by counterparty, net of amounts available for offset under a master netting agreement as of December 31, 2022: As of December 31, 2022 Counterparty Derivative Assets Derivative Liabilities Net Value of Derivatives Non-Cash Collateral (Received) Pledged (1) Cash Collateral (Received) Pledged (1) Net Amount of Derivative Assets (Liabilities) (2) BP Energy Co. — $ (698) $ (698) — — $ (698) ______________ (1) In some instances, the actual amount of the collateral received and/or pledged may be more than the amount shown due to overcollateralization. (2) Net amount of derivative assets and liabilities represents the net amount due from the counterparty to the Company and the net amount due from the Company to the counterparty, respectively, in the event of default.

Investment Portfolio (Tables)

Investment Portfolio (Tables)	12 Months Ended
Investment Portfolio (Tables)	Dec. 31, 2023
Schedule of Investments [Abstract]
Schedule of Investments	The following table summarizes the composition of the Company’s investment portfolio at cost and fair value as of December 31, 2023 and 2022: December 31, 2023 December 31, 2022 Amortized (1) Fair Value Percentage Amortized (1) Fair Value Percentage Senior Secured Loans—First Lien $ 878,013 $ 825,158 54 % $ 702,842 $ 706,646 35 % Senior Secured Loans—Second Lien 55,064 54,424 4 % 143,153 143,270 7 % Senior Secured Bonds 82,793 84,468 5 % 10,064 10,074 0 % Unsecured Debt — — — 253,675 241,418 12 % Preferred Equity 252,450 259,990 17 % 425,182 400,414 20 % Sustainable Infrastructure Investments, LLC 43,150 39,427 3 % 54,514 51,098 2 % Equity/Other 211,461 238,729 16 % 333,510 494,195 24 % Short-Term Investments 20,994 21,000 1 % — — — Total $ 1,543,925 $ 1,523,196 100 % $ 1,922,940 $ 2,047,115 100 % _________________________ (1) Amortized cost represents the original cost adjusted for the amortization of premiums and/or accretion of discounts, as applicable, on investments. The table below describes investments by industry classification and enumerates the percentage, by fair value, of the total portfolio assets in such industries as of December 31, 2023 and 2022: December 31, 2023 December 31, 2022 Industry Classification Fair Value Percentage Fair Value Percentage Energy—Upstream $ 309,456 20 % $ 854,974 42 % Energy—Midstream 303,175 20 % 646,488 32 % Consumer Services 156,089 10 % — — Capital Goods 116,454 8 % — — Financial Services 83,197 6 % — — Health Care Equipment & Services 73,105 5 % — — Energy—Power 69,696 5 % 386,007 19 % Commercial & Professional Services (1) 62,036 4 % 12,508 0 % Materials 49,653 3 % — — Automobiles & Components 39,521 3 % — — Consumer Discretionary Distribution & Retail 37,428 3 % — — Energy—Service & Equipment (1) 33,734 2 % 96,040 5 % Transportation 30,157 2 % — — U.S. Treasury Bills 21,000 1 % — — Household & Personal Products 20,858 1 % — — Insurance 20,251 1 % — — Media & Entertainment 19,829 1 % — — Pharmaceuticals, Biotechnology & Life Sciences 19,300 1 % — — Consumer Staples Distribution & Retail 18,830 1 % — — Sustainable Infrastructure Investments, LLC (2) 39,427 3 % 51,098 2 % Total $ 1,523,196 100 % $ 2,047,115 100 % ____________ (1) FS/EIG Advisor monitors the industry classification of the Company’s investments and may from time to time reclassify such investments if it determines such reclassification is appropriate. During the years ended December 31, 2023 and 2022, two investments had their industry re-classified from Energy—Industrials to Commercial & Professional Services, and one investment had its industry re-classified from Energy—Service & Equipment to Commercial & Professional Services. (2) Sustainable Infrastructure Investments, LLC is generally comprised of midstream and renewables assets in the Energy sector.
Schedule of Nonconsolidated Subsidiary Portfolio	Below is a summary of SIIJV's portfolio, followed by a listing of the individual loans in SIIJV's portfolio as of December 31, 2023 and 2022: December 31, 2023 December 31, 2022 Total investments (1) $ 170,083 $ 274,088 Weighted average current interest rate on debt investments (2) 7.45 % 6.96 % Number of portfolio assets in SIIJV 6 9 Largest investment in a single portfolio company (1) $ 57,227 $ 73,707 _______________ (1) At cost. (2) Computed as the (a) annual stated interest rate on accruing debt, divided by (b) total debt at par amount. Sustainable Infrastructure Investments, LLC Portfolio As of December 31, 2023 Portfolio Company (a)(f) Footnotes Energy Industry Rate (b) Maturity Principal (c) Amortized Fair (d) Senior Secured Loans—First Lien—100.0% Blue Heron Intermediate Holdco I, LLC Midstream S+188 4/22/24 $ 30,661 $ 30,661 $ 30,692 Copper Mountain Solar 3, LLC Renewables S+188 5/31/25 16,104 16,104 16,172 FLNG Liquefaction 2, LLC Midstream S+150 12/31/26 26,567 26,567 26,557 NES Hercules Class B Member, LLC Renewables S+163 1/31/28 24,176 24,176 24,769 ST EIP Holdco LLC Midstream S+250 11/5/24 57,227 57,227 57,143 Top of the World Wind Energy LLC Renewables S+213 12/1/28 15,348 15,348 15,616 Total Senior Secured Loans—First Lien 170,083 170,949 TOTAL INVESTMENTS—100.0% $ 170,083 $ 170,949 Sustainable Infrastructure Investments, LLC Portfolio As of December 31, 2022 Portfolio Company (a)(f) Footnotes Industry Rate (b) Maturity Principal (c) Amortized Fair (d) Senior Secured Loans—First Lien—100.0% Alianca Transportadora de Gas Participacoes S.A. Midstream L+260 5/23/27 $ 73,707 $ 73,707 $ 74,601 Blue Heron Intermediate Holdco I, LLC Midstream L+188 4/22/24 31,832 31,832 31,885 Cedar Creek II LLC Renewables L+188 11/18/23 8,710 8,710 8,722 Copper Mountain Solar 3, LLC Renewables L+175 5/31/25 17,804 17,804 17,879 FLNG Liquefaction 2, LLC Midstream L+150 12/31/26 28,170 28,170 27,990 Meikle Wind Energy, LP (e) Renewables C+150 5/12/24 C$ 16,030 12,332 11,873 NES Hercules Class B Member, LLC Renewables L+150 1/31/28 $ 24,487 24,487 24,954 ST EIP Holdco LLC Midstream L+250 11/5/24 58,673 58,673 58,288 Top of the World Wind Energy LLC Renewables L+188 12/1/28 18,373 18,373 18,866 Total Senior Secured Loans—First Lien 274,088 275,058 TOTAL INVESTMENTS—100.0% $ 274,088 $ 275,058 _____________________ Percentages are shown as a percentage of total investments. (a) Security may be an obligation of one or more entities affiliated with the named company. (b) Certain variable rate securities in SIIJV’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of December 31, 2023 and 2022, the three-month SOFR, or S, was 5.33% and 4.59%, respectively. SOFR based contracts may include a credit spread adjustment that is charged in addition to the base rate and basis point spread. As of December 31, 2022, the three-month LIBOR, or L, was 4.77% and the Canadian Dollar Offered Rate, or C, was 4.94%. (c) Denominated in U.S. dollars unless otherwise noted. (d) Security is classified as Level 3 and fair value is determined in accordance with SIIJV’s valuation process. (e) Investment denominated in Canadian dollars. Amortized cost and fair value are converted into U.S. dollars as of December 31, 2022. (f) Security or portion thereof is held within Seine Funding and is pledged as collateral supporting the amounts outstanding under the Seine Funding Facility. Below is selected balance sheet information for SIIJV as of December 31, 2023 and 2022: December 31, 2023 December 31, 2022 Selected Balance Sheet Information Total investments, at fair value $ 170,949 $ 275,058 Cash and other assets 29,089 10,380 Total assets $ 200,038 $ 285,438 Debt $ 145,483 $ 213,583 Other liabilities 3,406 3,358 Total liabilities 148,889 216,941 Members' equity $ 51,149 $ 68,497 Below is selected statement of operations information for SIIJV for the years ended December 31, 2023 and 2022: Year Ended December 31, 2023 2022 Selected Statement of Operations Information Total investment income $ 18,760 $ 11,463 Expenses Interest expense 12,438 6,994 Administrative services 173 166 Custodian and accounting fees 183 184 Professional services 203 125 Other 49 54 Total expenses 13,046 7,523 Net investment income 5,714 3,940 Net realized and unrealized gain (loss) (562) (821) Net increase in net assets resulting from operations $ 5,152 $ 3,119

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	12 Months Ended
Fair Value of Financial Instruments (Tables)	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Schedule of Fair Value Hierarchy of Investments	As of December 31, 2023 and 2022, the Company’s investments were categorized as follows in the fair value hierarchy: Valuation Inputs December 31, 2023 December 31, 2022 Level 1—Price quotations in active markets $ — $ 2,465 Level 2—Significant other observable inputs 683,716 450,445 Level 3—Significant unobservable inputs 839,480 1,594,205 Total $ 1,523,196 $ 2,047,115
Schedule of Fair Value Hierarchy of Assets and Liabilities	As of December 31, 2023 and 2022, the Company’s swap contracts were categorized as follows in the fair value hierarchy: December 31, 2023 December 31, 2022 Valuation Inputs Assets Liabilities Assets Liabilities Level 1—Price quotations in active markets $ — $ — $ — $ — Level 2—Significant other observable inputs — — — 698 Level 3—Significant unobservable inputs — — — — Total $ — $ — $ — $ 698
Schedule of Fair Value of Assets Rollforward	The following is a reconciliation for the years ended December 31, 2023 and 2022 of investments for which significant unobservable inputs (Level 3) were used in determining fair value: For the Year Ended December 31, 2023 Senior Secured Senior Secured Senior Unsecured Debt Preferred Equity Sustainable Infrastructure Investments, LLC Equity/ Total Fair value at beginning of period $ 443,245 $ 143,270 $ 10,074 $ 54,374 $ 400,414 $ 51,098 $ 491,730 $ 1,594,205 Accretion of discount (amortization of premium) 2,227 757 42 107 1,230 — — 4,363 Net realized gain (loss) (8,935) (52) 6 232 (11,847) — (27,458) (48,054) Net change in unrealized appreciation (depreciation) (61,574) (756) (87) (95) 32,308 (307) (133,481) (163,992) Purchases 95,512 — — — — — 1,746 97,258 Paid-in-kind interest 9,858 — — 4,341 — — — 14,199 Sales and repayments (243,026) (88,795) (161) (58,959) (162,115) (11,364) (94,079) (658,499) Transfers into Level 3 — — — — — — — — Transfers out of Level 3 — — — — — — — — Fair value at end of period $ 237,307 $ 54,424 $ 9,874 $ — $ 259,990 $ 39,427 $ 238,458 $ 839,480 The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date $ (62,195) $ (440) $ (87) $ — $ 26,665 $ (307) $ (158,534) $ (194,898) For the Year Ended December 31, 2022 Senior Secured Senior Secured Senior Unsecured Debt Preferred Equity Sustainable Infrastructure Investments, LLC Equity/ Total Fair value at beginning of period $ 414,075 $ 84,083 $ 10,371 $ 104,659 $ 497,288 $ 50,770 $ 460,236 $ 1,621,482 Accretion of discount (amortization of premium) 1,781 275 48 151 4,194 — — 6,449 Net realized gain (loss) (12,186) 12 — (27,542) 7,203 — 71,214 38,701 Net change in unrealized appreciation (depreciation) 25,893 (644) (345) 34,305 (6,345) 328 61,335 114,527 Purchases 112,154 110,150 — 19,800 — — 16,052 258,156 Paid-in-kind interest 11,284 537 — 7,916 188 — — 19,925 Sales and repayments (168,461) (51,143) — (84,915) (102,114) — (117,107) (523,740) Transfers into Level 3 (1) 58,705 — — — — — — 58,705 Transfers out of Level 3 — — — — — — — — Fair value at end of period $ 443,245 $ 143,270 $ 10,074 $ 54,374 $ 400,414 $ 51,098 $ 491,730 $ 1,594,205 The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date $ 15,525 $ (421) $ (345) $ (382) $ (3,691) $ 328 $ 74,950 $ 85,964 ________________________ (1) Changes in inputs or methodologies used for valuing investments may result in transfers into or out of levels within the fair value hierarchy. Transfers between levels of the fair value hierarchy are deemed to have occurred at the beginning of the reporting period. For the year ended December 31, 2022, transfers into Level 3 were due to decreased price transparency.
Schedule of Valuation Techniques and Significant Unobservable Inputs Used in Recurring Level 3 Fair Value	The valuation techniques and significant unobservable inputs used in recurring Level 3 fair value measurements as of December 31, 2023 and 2022 were as follows: Type of Investment Fair Value at December 31, 2023 Valuation Technique (1) Unobservable Input Range Weighted Senior Secured Loans—First Lien $ 212,250 Market Comparables Market Yield (%) 8.2%-20.5% 13.6% EBITDA Multiples (x) 3.9x-4.6x 4.4x 4,807 Discounted Cash Flow Discount Rate (%) 9.0%-13.0% 10.8% 20,250 Other (2) Senior Secured Loans—Second Lien 54,424 Market Comparables Market Yield (%) 12.5%-14.0% 13.1% Senior Secured Bonds 9,874 Market Comparables Market Yield (%) 7.5%-8.5% 8.0% Preferred Equity 259,990 Market Comparables Market Yield (%) 10.0%-23.0% 17.5% EBITDA Multiples (x) 12.0x-13.0x 12.5x Net Aircraft Book Value Multiple (x) 1.0x-1.1x 1.0x Sustainable Infrastructure Investments, LLC 39,427 Discounted Cash Flow Discount Rate (%) 8.0%-10.0% 9.0% Equity/Other 51,160 Market Comparables EBITDA Multiples (x) 2.7x-13.0x 6.0x Production Multiples (MMcfe/d) $3,000.0-$3,600.0 $3,300.0 Proved Reserves Multiples (Bcfe) 0.7x-0.7x 0.7x PV-10 Multiples (x) 0.3x-0.4x 0.3x 166,946 Discounted Cash Flow Discount Rate (%) 8.0%-17.1% 16.5% 7,121 Option Valuation Model Volatility (%) 55.0%-65.0% 60.0% 13,231 Other (2) Total $ 839,480 Type of Investment Fair Value at December 31, 2022 Valuation Technique (1) Unobservable Input Range Weighted Senior Secured Loans—First Lien $ 413,268 Market Comparables Market Yield (%) 8.5%-21.8% 12.3% EBITDA Multiples (x) 5.0x-7.5x 6.3x 29,977 Discounted Cash Flow Discount Rate (%) 11.5%-19.5% 15.4% Senior Secured Loans—Second Lien 143,270 Market Comparables Market Yield (%) 10.3%-14.3% 11.8% Senior Secured Bonds 10,074 Market Comparables Market Yield (%) 6.9%-7.9% 7.4% Unsecured Debt 19,256 Market Comparables Market Yield (%) 10.3%-11.3% 10.8% 35,118 Other (2) Preferred Equity 316,767 Market Comparables Market Yield (%) 8.8%-30.3% 19.0% EBITDA Multiples (x) 9.5x-10.5x 10.0x Net Aircraft Book Value Multiple (x) 1.0x-1.0x 1.0x 83,647 Discounted Cash Flow Discount Rate (%) 11.3%-12.3% 11.8% Sustainable Infrastructure Investments, LLC 51,098 Discounted Cash Flow Discount Rate (%) 13.5%-14.5% 14.0% Equity/Other 481,623 Market Comparables EBITDA Multiples (x) 1.8x-10.5x 5.4x Production Multiples (Mboe/d) $27,946.0-$37,500.0 $30,265.3 Proved Reserves Multiples (Mmboe) $6.9-$10.3 $7.6 Production Multiples (MMcfe/d) $3,400.0-$3,700.0 $3,550.0 Proved Reserves Multiples (Bcfe) 0.8x-0.9x 0.8x PV-10 Multiples (x) 0.5x-0.9x 0.8x 2,488 Discounted Cash Flow Discount Rate (%) 8.0%-33.0% 23.8% 5,734 Option Valuation Model Volatility (%) 31.5%-55.1% 36.6% 1,885 Other (2) Total $ 1,594,205 ________________________ (1) For investments utilizing a market comparables valuation technique, a significant increase (decrease) in the market yield, in isolation, would result in a significantly lower (higher) fair value measurement, and a significant increase (decrease) in any of the valuation multiples, in isolation, would result in a significantly higher (lower) fair value measurement. For investments utilizing a discounted cash flow valuation technique, a significant increase (decrease) in the discount rate, in isolation, would result in a significantly lower (higher) fair value measurement. For investments utilizing an option valuation model valuation technique, a significant increase (decrease) in the volatility, in isolation, would result in a significantly higher (lower) fair value measurement. (2) Fair valued based on expected outcome of proposed corporate transactions, the expected value of the liquidation preference of the investment or other factors.

Financing Arrangements (Tables)

Financing Arrangements (Tables)	12 Months Ended
Financing Arrangements (Tables)	Dec. 31, 2023
Debt Disclosure [Abstract]
Schedule of Outstanding Financing Arrangements	The following tables present a summary of information with respect to the Company’s outstanding financing arrangements as of December 31, 2023 and 2022: As of December 31, 2023 Arrangement (1) Type of Arrangement Rate (2) Amount Amount Maturity Date Barclays Facility Repurchase Term SOFR+3.00% $ 400,000 $ 100,000 September 6, 2026 Total $ 400,000 $ 100,000 As of December 31, 2022 Arrangement (1) Type of Arrangement Rate (4) Amount Amount Maturity Date JPMorgan Facility Term Loan L+3.00% $ 305,676 $ — February 16, 2023 (5) Senior Secured Notes (3) Bond 7.50% 457,075 — August 15, 2023 (6) Total $ 762,751 $ — ________________________ (1) The carrying amount outstanding under the facility approximates its fair value, unless otherwise noted. (2) The financing fee under the Barclays Facility is based on three-month term SOFR (with a floor of 0.00%) plus a facility margin calculated monthly as the weighted average of the individual margin of the collateral obligations (subject to a floor, in the aggregate, of 3.00% ) . (3) As of December 31, 2022, the fair value of the Senior Secured Notes was approximately $458,908. This valuation is considered a Level 2 valuation within the fair value hierarchy. (4) LIBOR was subject to a 0.00% floor. (5) On February 14, 2023, the Company repaid and terminated the JPMorgan Facility. (6) On May 15, 2023, the Company redeemed 100% of the issued and outstanding Senior Secured Notes at a price equal to 100% of the aggregate principal amount, plus the accrued but unpaid interest through to, but excluding, May 15, 2023.
Schedule of Interest Expense	For the years ended December 31, 2023, 2022 and 2021, the components of total interest expense for the Company’s financing arrangements were as follows: Year Ended December 31, 2023 2022 2021 Arrangement (1) Direct Interest Expense (2) Amortization of Deferred Financing Costs and Discount Total Interest Expense Direct Interest Expense (2) Amortization of Deferred Financing Costs and Discount Total Interest Expense Direct Interest Expense (2) Amortization of Deferred Financing Costs and Discount Total Interest Expense Barclays Facility $ 4,734 $ 636 $ 5,370 $ — $ — $ — $ — $ — $ — JPMorgan Facility (3) 2,790 238 3,028 14,670 1,798 16,468 9,623 3,780 13,403 Senior Secured Notes (4) 12,760 2,540 15,300 34,951 4,297 39,248 36,675 4,044 40,719 Total $ 20,284 $ 3,414 $ 23,698 $ 49,621 $ 6,095 $ 55,716 $ 46,298 $ 7,824 $ 54,122 _________________________ (1) Borrowings of each of the Company's wholly-owned special-purpose financing subsidiaries are considered borrowings of the Company for purposes of complying with the asset coverage requirements applicable to BDCs under the 1940 Act. (2) Direct interest expense includes the effect of non-usage fees, administration fees and make-whole fees, if any. (3) On February 14, 2023, the Company repaid and terminated the JPMorgan Facility. (4) On May 15, 2023, the Company redeemed 100% of the issued and outstanding Senior Secured Notes at a price equal to 100% of the aggregate principal amount, plus the accrued but unpaid interest through to, but excluding, May 15, 2023.

Senior Securities Asset Cover_2

Senior Securities Asset Coverage (Tables)	12 Months Ended
Senior Securities Asset Coverage (Tables)	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Schedule of Senior Securities Information	Information about the Company's senior securities is shown in the table below as of December 31, 2023, 2022, 2021, 2020 and 2019: As of December 31, Total Amount Outstanding Exclusive of Treasury Securities Asset Coverage Per Unit (1) Involuntary Liquidation Preference per Unit (2) Average Market Value per Unit (Exclude Bank Loans) (3) 2019 $ 1,236,667 $ 2,924 — N/A 2020 $ 905,667 $ 2,577 — N/A 2021 $ 775,667 $ 3,066 — N/A 2022 $ 762,751 $ 3,299 — N/A 2023 $ 400,000 $ 4,905 — N/A _________________________ (1) Asset coverage per unit is the ratio of the carrying value of the Company’s total consolidated assets, less all liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness. Asset coverage per unit is expressed in terms of dollar amounts per $1,000 of indebtedness. All prior period ratios have been updated to conform with this current presentation. (2) The amount to which such class of senior security would be entitled upon the voluntary liquidation of the Company in preference to any security junior to it. The “ — ” in this column indicates that the SEC expressly does not require this information to be disclosed for certain types of senior securities. (3) Not applicable because senior securities are not registered for public trading on an exchange.

Financial Highlights (Tables)

Financial Highlights (Tables)	12 Months Ended
Financial Highlights (Tables)	Dec. 31, 2023
Investment Company [Abstract]
Schedule of Financial Highlights	The following is a schedule of financial highlights of the Company for the years ended December 31, 2023, 2022, 2021, 2020 and 2019: Year Ended December 31, 2023 2022 2021 2020 2019 Per Share Data: (1) Net asset value, beginning of year $ 3.88 $ 3.59 $ 3.25 $ 5.43 $ 6.01 Results of operations (2) Net investment income 0.18 0.16 0.09 0.19 0.46 Net realized gain (loss) and unrealized appreciation (depreciation) (0.44) 0.25 0.37 (2.20) (0.54) Net increase (decrease) in net assets resulting from operations (0.26) 0.41 0.46 (2.01) (0.08) Shareholder distributions (3) Distributions from net investment income (0.19) (0.12) (0.12) (0.14) (0.50) Distributions representing return of capital — — — (0.03) — Net decrease in net assets resulting from shareholder distributions (0.19) (0.12) (0.12) (0.17) (0.50) Capital share transactions Issuance of common shares (4) — — — — — Net increase (decrease) in net assets resulting from capital share transactions — — — — — Net asset value, end of year $ 3.43 $ 3.88 $ 3.59 $ 3.25 $ 5.43 Shares outstanding, end of year 455,506,155 451,465,673 446,089,499 440,020,123 438,477,007 Total return (5) (6.89) % 11.39 % 14.22 % (37.68) % (1.83) % Total return (without assuming reinvestment of distributions) (5) (6.70) % 11.29 % 14.15 % (37.02) % (1.33) % Ratio/Supplemental Data: Net assets, end of year $ 1,562,055 $ 1,753,748 $ 1,602,323 $ 1,428,577 $ 2,379,605 Ratio of net investment income to average net assets (6)(7) 4.77 % 4.02 % 2.77 % 4.82 % 7.76 % Ratio of total operating expenses to average net assets (6) 4.50 % 6.78 % 6.96 % 8.20 % 6.54 % Ratio of management fee offset to average net assets (6) (0.02) % (0.15) % (0.09) % (0.04) % (0.23) % Ratio of net operating expenses to average net assets (6) 4.48 % 6.63 % 6.87 % 8.16 % 6.31 % Ratio of interest expense to average net assets (6) 1.39 % 3.21 % 3.46 % 4.39 % 3.40 % Ratio of federal and state taxes to average net assets (6) 0.15 % 0.13 % — — — Portfolio turnover 45.84 % 16.15 % 44.25 % 26.54 % 32.88 % Total amount of senior securities outstanding, exclusive of treasury securities $ 400,000 $ 762,751 $ 775,667 $ 905,667 $ 1,236,667 Asset coverage per unit (8) $ 4,905 $ 3,299 $ 3,066 $ 2,577 $ 2,924 Asset coverage ratio (8) 4.91 3.30 3.07 2.58 2.92 _________________________ (1) Per share data may be rounded in order to recompute the ending net asset value per share. (2) The per share data was derived by using the weighted average shares outstanding during the applicable year. (3) The per share data for distributions reflects the actual amount of distributions paid per share during the applicable year. (4) The issuance of common shares on a per share basis reflects the incremental net asset value changes as a result of the issuance of common shares pursuant to the Company’s distribution reinvestment plan. The issuance of common shares at a price that is greater than the net asset value per share results in an increase in net asset value per share. (5) The total return for each year presented was calculated based on the change in net asset value during the applicable year, including the impact of distributions reinvested in accordance with the Company’s distribution reinvestment plan. Following the termination of the Company’s distribution reinvestment plan effective September 15, 2023, the total return for each year presented subsequent to the effective date was calculated based on the change in net asset value during the applicable year, assuming the reinvestment of all distributions at the Company’s net asset value per share as of the end of the applicable period. The total return (without assuming reinvestment of distributions) for each year presented was calculated by taking the net asset value per share as of the end of the applicable year, adding the cash distributions per share which were declared during the applicable year and dividing the total by the net asset value per share at the beginning of the applicable year. The total returns do not consider the effect of any sales commissions or charges that may be incurred in connection with the sale of the Company’s common shares. The total returns include the effect of the issuance of common shares at a net offering price that is greater than net asset value per share, which causes an increase in net asset value per share. The historical calculations of total returns in the table should not be considered representations of the Company’s future total returns, which may be greater or less than the returns shown in the table due to a number of factors, including the Company’s ability or inability to make investments in companies that meet its investment criteria, the interest rates payable on the debt securities the Company acquires, the level of the Company’s expenses, variations in and the timing of the recognition of realized and unrealized gains or losses, the degree to which the Company encounters competition in its markets and general economic conditions. As a result of these factors, results for any previous year should not be relied upon as being indicative of performance in future years. The total return calculations set forth above represent the total returns on the Company’s investment portfolio during the applicable year and do not represent actual returns to shareholders. (6) Weighted average net assets during the applicable years are used for this calculation. (7) If FS/EIG Advisor had not agreed to offset the amount of any structuring, upfront or certain other fees it or its members received against the management fee payable by the Company, the ratio of net investment income to average net assets would have been 4.75%, 3.87%, 2.68%, 4.78% and 7.53% for the years ended December 31, 2023, 2022, 2021, 2020 and 2019, respectively. See Note 4 for a discussion of the management fee offset with FS/EIG Advisor. (8) Asset coverage per unit is the ratio of the carrying value of the Company's total consolidated assets, less liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness. Asset coverage per unit is expressed in terms of dollar amounts per $1,000 of indebtedness. All prior period ratios have been updated to conform with this current presentation.

Selected Quarterly Financial _2

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
Selected Quarterly Financial Data (Unaudited) (Tables)	Dec. 31, 2023
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Results of Operations	The following is the quarterly results of operations for the years ended December 31, 2023 and 2022. The following information reflects all normal recurring adjustments necessary for a fair presentation of the information for the periods presented. The operating results for any quarter are not necessarily indicative of results for any future period. Quarter Ended December 31, 2023 September 30, 2023 June 30, 2023 March 31, 2023 Investment income $ 42,708 $ 30,443 $ 41,476 $ 43,095 Operating expenses Total expenses and federal and state taxes 17,125 13,788 19,594 26,193 Less: Management fee offset (4) (63) (19) (255) Net expenses and federal and state taxes 17,121 13,725 19,575 25,938 Net investment income 25,587 16,718 21,901 17,157 Realized and unrealized gain (loss) (62,142) (44,141) (46,552) (49,711) Net increase (decrease) in net assets resulting from operations $ (36,555) $ (27,423) $ (24,651) $ (32,554) Per share information—basic and diluted Net investment income $ 0.05 $ 0.04 $ 0.05 $ 0.04 Net increase (decrease) in net assets resulting from operations $ (0.08) $ (0.06) $ (0.05) $ (0.07) Weighted average shares outstanding 455,506,174 455,401,486 454,041,028 452,684,238 Quarter Ended December 31, 2022 September 30, 2022 June 30, 2022 March 31, 2022 Investment income $ 59,535 $ 42,450 $ 47,073 $ 35,909 Operating expenses Total expenses and federal income and excise taxes 32,157 29,306 27,937 28,417 Less: Management fee offset (13) (208) (1,700) (698) Net expenses and federal income and excise taxes 32,144 29,098 26,237 27,719 Net investment income 27,391 13,352 20,836 8,190 Realized and unrealized gain (loss) 2,849 (64,453) (5,256) 181,593 Net increase (decrease) in net assets resulting from operations $ 30,240 $ (51,101) $ 15,580 $ 189,783 Per share information—basic and diluted Net investment income $ 0.06 $ 0.03 $ 0.05 $ 0.02 Net increase (decrease) in net assets resulting from operations $ 0.07 $ (0.11) $ 0.03 $ 0.42 Weighted average shares outstanding 451,364,025 450,023,829 448,730,149 447,404,395

Principal Business and Organi_2

Principal Business and Organization (Details)	Sep. 29, 2023	Sep. 28, 2023
Debt and Other Credit Investments
Schedule of Investments [Line Items]
Percentage of investments total assets	80%
Energy Investment
Schedule of Investments [Line Items]
Percentage of investments total assets		80%

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Fee income	$ 591	$ 0	$ 0
Ordinary income percentage	98%
Capital gain net income percentage	98.20%
Provision for taxes	$ 0	$ 1,207
Investment Advisory Agreement - Incentive Rate, Realized Capital Gains \| Related Party
Related Party Transaction [Line Items]
Incentive fee percentage	20%
Investment Advisory Agreement - Incentive Rate, Quarterly In Arrears Catch-up Threshold \| Related Party
Related Party Transaction [Line Items]
Incentive fee percentage	20%
Investment Advisory Agreement - Incentive Rate, Quarterly Catch-up Threshold \| Related Party
Related Party Transaction [Line Items]
Incentive fee percentage	1.625%
Investment Advisory Agreement - Incentive Rate, Annualized Hurdle Rate \| Related Party
Related Party Transaction [Line Items]
Incentive fee percentage	6.50%
Investment Advisory Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch-Up Threshold \| Related Party
Related Party Transaction [Line Items]
Incentive fee percentage	2.031%
Investment Advisory Agreement - Incentive Rate, Annualized Catch-Up Threshold \| Related Party
Related Party Transaction [Line Items]
Incentive fee percentage	8.125%

Share Transactions - Schedule o

Share Transactions - Schedule of Common Stock Transactions (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Equity [Abstract]
Reinvestment of Distributions (in shares)		4,040,482	5,376,174	6,069,376
Reinvestment of Distributions	[1]	$ 15,549	$ 20,861	$ 21,135
Proceeds from Share Transactions (in shares)		4,040,482	5,376,174	6,069,376
Proceeds from Share Transactions		$ 15,549	$ 20,861	$ 21,135

[1]See Note 3 for a discussion of the Company’s capital share transactions.

Share Transactions - Narrative

Share Transactions - Narrative (Details) - Distribution Reinvestment Plan - USD ($) $ in Thousands		12 Months Ended
	May 05, 2017	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Weighted average number of common shares outstanding in prior year	10%
Weighted average number of common shares outstanding	2.50%
Distribution reinvestment plan term	12 months
Distribution reinvestment plan term expiree	3 months
Share distribution not more than net asset value per common share		2.50%
Termination period		30 days
Number of treasury shares repurchased		0	0	0
Minimum investment threshold		$ 5
Written notice period		30 days

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Investment company, contractual fee waived	[1]	$ 341	$ 2,619	$ 1,439
Related Party \| Investment Advisory Agreement
Related Party Transaction [Line Items]
Management and service fees, base rate (percent)		1.75%
Investment company, contractual fee waived		$ 341	$ 2,619	$ 1,439

[1] See Note 4 for a discussion of the offset by FS/EIG Advisor, LLC, the Company's investment adviser, of certain management fees to which it was otherwise entitled during the applicable period.

Related Party Transactions - Sc

Related Party Transactions - Schedule of the Fees and Expenses Accrued (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Administrative services expenses		$ 6,087	$ 5,626	$ 5,713
Base management fee		35,377	44,559	41,561
Investment company, contractual fee waived	[1]	341	2,619	1,439
Management fees payable		8,416	11,185
Related Party
Related Party Transaction [Line Items]
Base management fee		35,036	41,940	40,122
Administrative services expenses		6,087	5,626	5,713
Base management fee		37,805	41,221	39,812
Administrative services expenses payable		4,431	3,930	3,450
Payment for administrative services expenses		$ 6,469	$ 5,134	$ 4,849

[1] See Note 4 for a discussion of the offset by FS/EIG Advisor, LLC, the Company's investment adviser, of certain management fees to which it was otherwise entitled during the applicable period.

Distributions - Schedule of Cas

Distributions - Schedule of Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
		Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Distributions (in USD per share)		$ 0.0643	$ 0.1892	$ 0.1200	$ 0.1200	$ 0.17	$ 0.50
Amount	[1]		$ 86,059	$ 53,938	$ 53,264

[1]See Note 5 for a discussion of the sources of distributions paid by the Company.

Distributions - Narrative (Deta

Distributions - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended	12 Months Ended
	Oct. 18, 2023	Jan. 31, 2024	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investment Company, Changes in Net Assets [Line Items]
Distributions declared (in USD per share)	$ 0.0683		$ 0.0609
Distributions (in USD per share)				$ 0.0643	$ 0.1892	$ 0.1200	$ 0.1200	$ 0.17	$ 0.50
Annualized distribution rate					7.50%
Net asset value per common share at year end (in USD per share)			$ 3.43	$ 3.43	$ 3.43	$ 3.88	$ 3.59	$ 3.25	$ 5.43	$ 6.01
Maximum cap on annualized distribution rate					15%
Net investment income on a tax basis					$ 101,804	$ 69,711	$ 80,892
Distributable ordinary income			$ 36,369	$ 36,369	36,369	21,803
Increase (decrease) accumulated earnings (deficit)					(21,053)	41,185
Income tax purposes			1,587,709	1,587,709	1,587,709	2,223,943
Net unrealized appreciation (depreciation)			(64,513)	(64,513)	(64,513)	(176,828)
Deferred tax asset			142,608	142,608	142,608	145,383
Deferred tax liability			2,595	2,595	2,595	28,753
Deferred tax asset valuation allowance			$ 140,013	$ 140,013	$ 140,013	116,630
Current income tax						$ 1,207
Subsequent Event
Investment Company, Changes in Net Assets [Line Items]
Distributions declared (in USD per share)		$ 0.0034

Distributions - Schedule of C_2

Distributions - Schedule of Cash Distributions on Common Stock (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Distribution Amount
Net investment income		$ 86,059	$ 53,938	$ 53,264
Short-term capital gains proceeds from the sale of assets		0	0	0
Long-term capital gains proceeds from the sale of assets		0	0	0
Return of capital		0	0	0
Total	[1]	$ 86,059	$ 53,938	$ 53,264
Percentage
Net investment income		100%	100%	100%
Short-term capital gains proceeds from the sale of assets		0%	0%	0%
Long-term capital gains proceeds from the sale of assets		0%	0%	0%
Return of capital		0%	0%	0%
Total		100%	100%	100%
Gross investment income attributable to cash income earned		87.10%	85.50%	74.10%
Gross investment income attributable to paid-in-kind interest		9%	10.80%	18.50%
Gross investment income attributable to non-cash accretion of discount		3.90%	3.70%	7.40%

[1]See Note 5 for a discussion of the sources of distributions paid by the Company.

Distributions - Schedule of Rec

Distributions - Schedule of Reconciliation Between GAAP-basis Net Investment Income and Tax-Basis Net Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
GAAP-basis net investment income	$ 25,587	$ 16,718	$ 21,901	$ 17,157	$ 27,391	$ 13,352	$ 20,836	$ 8,190	$ 81,363	$ 69,769	$ 43,259
Reclassification of unamortized original issue discount and prepayment fees									(5,072)	(12,480)	(4,030)
GAAP vs. tax-basis impact of consolidation of certain subsidiaries									2,652	1,242	13,532
Income subject to tax not recorded for GAAP (income recorded for GAAP not subject to tax)									22,612	13,036	28,182
Other miscellaneous differences									249	(1,856)	(51)
Tax-basis net investment income									$ 101,804	$ 69,711	$ 80,892

Distributions - Schedule of Acc

Distributions - Schedule of Accumulated Earnings on a Tax Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Distributable ordinary income	$ 36,369	$ 21,803
Accumulated capital losses	(1,595,362)	(1,282,145)
Other temporary differences	(670)	(83)
Net unrealized appreciation (depreciation) on investments, swap contracts and foreign currency	(64,522)	(177,571)
Total	(1,624,185)	(1,437,996)
Short-term capital loss carryforwards	74,081
Long-term capital loss carryforwards	1,521,281
Unrealized appreciation	148,817	334,635
Unrealized loss on foreign currency	$ 213,339	$ 512,206

Financial Instruments - Narrati

Financial Instruments - Narrative (Details) $ in Thousands	12 Months Ended
Financial Instruments - Narrative (Details) $ in Thousands	Dec. 31, 2023 USD ($) MMBTU bbl	Dec. 31, 2022 MMBTU bbl
Commodity Fixed Price Swaps—Crude Oil
Derivative [Line Items]
Notional volume of fixed price swap contracts-crude oil \| bbl	88,849	207,555
Commodity Fixed Price Swaps—Natural Gas
Derivative [Line Items]
Notional volume of fixed price swap contracts-natural gas \| MMBTU	169,313	398,707
Equity Total Return Swaps
Derivative [Line Items]
Term of contract	3 years
Average monthly notional amount \| $	$ 19,939

Financial Instruments - Schedul

Financial Instruments - Schedule of Fair Value of Open Swap Contracts (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative Assets	$ 0	$ 0
Derivative Liabilities	0	(698)
Commodity Fixed Price Swaps—Crude Oil
Derivative [Line Items]
Derivative Assets	0	0
Derivative Liabilities	0	(572)
Commodity Fixed Price Swaps—Natural Gas
Derivative [Line Items]
Derivative Assets	0	0
Derivative Liabilities	0	(126)
Equity Total Return Swaps
Derivative [Line Items]
Derivative Assets	0	0
Derivative Liabilities	$ 0	$ 0

Financial Instruments - Sched_2

Financial Instruments - Schedule of Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net Realized Gains (Losses)	$ 1,048	$ (2,785)	$ 0
Net Change in Unrealized Appreciation (Depreciation)	698	(698)	$ 0
Commodity Fixed Price Swaps—Crude Oil
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net Realized Gains (Losses)	(363)	(2,030)
Net Change in Unrealized Appreciation (Depreciation)	572	(572)
Commodity Fixed Price Swaps—Natural Gas
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net Realized Gains (Losses)	394	(755)
Net Change in Unrealized Appreciation (Depreciation)	126	(126)
Equity Total Return Swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net Realized Gains (Losses)	1,017	0
Net Change in Unrealized Appreciation (Depreciation)	$ 0	$ 0

Financial Instruments - Sched_3

Financial Instruments - Schedule of Derivative Assets and Liabilities by Counterparty (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 0	$ 0
Derivative Liabilities	$ 0	(698)
BP Energy Co [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets		0
Derivative Liabilities		(698)
Net Value of Derivatives		(698)
Non-Cash Collateral (Received) Pledged		0
Cash Collateral (Received) Pledged		0
Net Amount of Derivative Assets (Liabilities)		$ (698)

Investment Portfolio - Schedule

Investment Portfolio - Schedule Of Investment Portfolio At Cost And Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022
Schedule of Investments [Line Items]
Amortized Cost	$ 1,543,925	[1]	$ 1,922,940
Fair Value	1,523,196	[1],[2]	2,047,115	[3]
Senior Secured Loans—First Lien
Schedule of Investments [Line Items]
Amortized Cost	878,013	[1]	702,842	[4]
Fair Value	825,158	[1],[2]	706,646	[3],[4]
Senior Secured Loans—Second Lien
Schedule of Investments [Line Items]
Amortized Cost	55,064		143,153	[4]
Fair Value	54,424		143,270	[3],[4]
Senior Secured Bonds
Schedule of Investments [Line Items]
Amortized Cost	82,793	[1]	10,064	[4]
Fair Value	84,468	[1],[2]	10,074	[3],[4]
Unsecured Debt
Schedule of Investments [Line Items]
Amortized Cost	0		253,675
Fair Value	0		241,418
Preferred Equity
Schedule of Investments [Line Items]
Amortized Cost	252,450	[1],[5]	425,182	[4],[6]
Fair Value	259,990	[1],[2],[5]	400,414	[3],[4],[6]
Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Amortized Cost	43,150	[1]	54,514	[4]
Fair Value	39,427	[1],[2]	51,098	[3],[4]
Equity/Other
Schedule of Investments [Line Items]
Amortized Cost	211,461		333,510
Fair Value	238,729		494,195
Short-Term Investments
Schedule of Investments [Line Items]
Amortized Cost	20,994	[1]	0
Fair Value	$ 21,000	[1],[2]	$ 0
Investment Owned, At Fair Value \| Customer Concentration Risk \| Total Investments
Schedule of Investments [Line Items]
Percentage of Portfolio	100%		100%
Investment Owned, At Fair Value \| Customer Concentration Risk \| Senior Secured Loans—First Lien
Schedule of Investments [Line Items]
Percentage of Portfolio	54%		35%
Investment Owned, At Fair Value \| Customer Concentration Risk \| Senior Secured Loans—Second Lien
Schedule of Investments [Line Items]
Percentage of Portfolio	4%		7%
Investment Owned, At Fair Value \| Customer Concentration Risk \| Senior Secured Bonds
Schedule of Investments [Line Items]
Percentage of Portfolio	5%		0%
Investment Owned, At Fair Value \| Customer Concentration Risk \| Unsecured Debt
Schedule of Investments [Line Items]
Percentage of Portfolio	0%		12%
Investment Owned, At Fair Value \| Customer Concentration Risk \| Preferred Equity
Schedule of Investments [Line Items]
Percentage of Portfolio	17%		20%
Investment Owned, At Fair Value \| Customer Concentration Risk \| Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Percentage of Portfolio	3%		2%
Investment Owned, At Fair Value \| Customer Concentration Risk \| Equity/Other
Schedule of Investments [Line Items]
Percentage of Portfolio	16%		24%
Investment Owned, At Fair Value \| Customer Concentration Risk \| Short-Term Investments
Schedule of Investments [Line Items]
Percentage of Portfolio	1%		0%

[1]Security may be an obligation of one or more entities affiliated with the named company.[2]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.[3]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.[4]Security may be an obligation of one or more entities affiliated with the named company.[5]Listed investments may be treated as debt for U.S. generally accepted accounting principles, or GAAP, or tax purposes.[6]Listed investments may be treated as debt for U.S. generally accepted accounting principles, or GAAP, or tax purposes.

Investment Portfolio - Narrativ

Investment Portfolio - Narrative (Details) $ in Thousands, $ in Thousands		Jan. 02, 2020 USD ($)	Jan. 02, 2020 CAD ($)	Dec. 31, 2023 USD ($) investment company	Dec. 31, 2023 CAD ($) investment company	Dec. 31, 2022 USD ($) company investment	Dec. 31, 2022 CAD ($) company investment
Schedule of Investments [Line Items]
Unfunded commitment with amortized cost						$ 2,500
Investment, Identifier [Axis]: AI Aqua Merger Sub, Inc., Capital Goods 1
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[4]			$ 16,522
Floor rate (percent)	[2],[3],[4],[5]			0.50%	0.50%
Variable rate (percent)	[2],[3],[4],[5]			4.25%	4.25%
Investment, Identifier [Axis]: AI Aqua Merger Sub, Inc., Capital Goods 2
Schedule of Investments [Line Items]
Principal amount	[1],[2],[4],[6]			$ 3,478
Floor rate (percent)	[2],[4],[5],[6]			0.50%	0.50%
Variable rate (percent)	[2],[4],[5],[6]			4.25%	4.25%
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Energy—Power
Schedule of Investments [Line Items]
Principal amount	[1],[2],[7],[8],[9]			$ 22,856
Floor rate (percent)	[2],[5],[7],[8],[9]			1.50%	1.50%
Variable rate (percent)	[2],[5],[7],[8],[9]			4%	4%
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 1
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[13],[14]					$ 22,734
Floor rate (percent)	[11],[12],[13],[14],[15]					1.50%	1.50%
Variable rate (percent)	[11],[12],[13],[14],[15]					4%	4%
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 2
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[13],[14],[16]					$ 5,359
Floor rate (percent)	[11],[12],[13],[14],[15],[16]					1.50%	1.50%
Variable rate (percent)	[11],[12],[13],[14],[15],[16]					4%	4%
Investment, Identifier [Axis]: Acrisure, LLC, Insurance
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 20,175
Variable rate (percent)	[2],[3],[5]			4.50%	4.50%
Investment, Identifier [Axis]: Aethon III BR LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[17]					$ 20,000
Floor rate (percent)	[11],[12],[15],[17]					1.50%	1.50%
Variable rate (percent)	[11],[12],[15],[17]					7.50%	7.50%
Investment, Identifier [Axis]: Aethon United BR LP, Upstream
Schedule of Investments [Line Items]
Principal amount	[10],[12],[17]					$ 40,500
Investment, Identifier [Axis]: Aimbridge Acquisition Co. Inc., Consumer Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 21,805
Variable rate (percent)	[2],[3],[5]			3.75%	3.75%
Investment, Identifier [Axis]: Allegiant Travel Co., Transportation
Schedule of Investments [Line Items]
Principal amount	[1],[2],[9]			$ 10,601
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 1
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[17],[18]					8,436
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 2
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[16],[18]					2,500
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 1
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 9,975
Floor rate (percent)	[2],[3],[5]			0.50%	0.50%
Variable rate (percent)	[2],[3],[5]			4.75%	4.75%
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 2
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 9,929
Floor rate (percent)	[2],[3],[5]			0.50%	0.50%
Variable rate (percent)	[2],[3],[5]			3.75%	3.75%
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Energy—Service & Equipment
Schedule of Investments [Line Items]
Principal amount	[1],[2],[7],[19],[20],[21]			$ 70,277
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Service & Equipment
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[17],[18]					63,888
Investment, Identifier [Axis]: American Auto Auction Group, LLC, Capital Goods
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 9,975
Floor rate (percent)	[2],[3],[5]			0.80%	0.80%
Variable rate (percent)	[2],[3],[5]			5%	5%
Investment, Identifier [Axis]: Archrock Partners, L.P., Midstream
Schedule of Investments [Line Items]
Principal amount	[10],[12],[14],[17]					3,098
Investment, Identifier [Axis]: Aretec Escrow Issuer Inc., Financial Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 7,000
Investment, Identifier [Axis]: Aretec Group, Inc., Financial Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[4]			$ 9,352
Variable rate (percent)	[2],[3],[4],[5]			4.50%	4.50%
Investment, Identifier [Axis]: Auris Luxembourg III S.a r.l, Health Care Equipment & Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[9]			$ 20,287
Variable rate (percent)	[2],[3],[5],[9]			3.75%	3.75%
Investment, Identifier [Axis]: Aveanna Healthcare LLC, Health Care Equipment & Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 15,909
Floor rate (percent)	[2],[3],[5]			0.50%	0.50%
Variable rate (percent)	[2],[3],[5]			3.75%	3.75%
Investment, Identifier [Axis]: BCPE Empire Holdings, Inc., Consumer Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 24,900
Floor rate (percent)	[2],[3],[5]			0.50%	0.50%
Variable rate (percent)	[2],[3],[5]			4.75%	4.75%
Investment, Identifier [Axis]: Brazos Delaware II LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	[10],[12]					$ 39,259
Variable rate (percent)	[12],[15]					4%	4%
Investment, Identifier [Axis]: CCS-CMGC Holdings, Inc., Health Care Equipment & Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 21,465
Variable rate (percent)	[2],[3],[5]			5.50%	5.50%
Investment, Identifier [Axis]: CPM Holdings, Inc., Capital Goods
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 20,000
Floor rate (percent)	[2],[3],[5]			0.50%	0.50%
Variable rate (percent)	[2],[3],[5]			4.50%	4.50%
Investment, Identifier [Axis]: CPV Maryland, LLC, Power
Schedule of Investments [Line Items]
Principal amount	[10],[12]					$ 14,286
Floor rate (percent)	[12],[15]					1%	1%
Variable rate (percent)	[12],[15]					4%	4%
Investment, Identifier [Axis]: CPV Shore Holdings LLC, Power
Schedule of Investments [Line Items]
Principal amount	[10],[12]					$ 23,601
Variable rate (percent)	[12],[15]					3.75%	3.75%
Investment, Identifier [Axis]: Charlotte Buyer, Inc., Health Care Equipment & Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[4]			$ 19,845
Floor rate (percent)	[2],[3],[4],[5]			0.50%	0.50%
Variable rate (percent)	[2],[3],[4],[5]			5.25%	5.25%
Investment, Identifier [Axis]: Cimarron Energy Inc., Service & Equipment
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[17],[22],[23]					$ 7,500
Floor rate (percent)	[11],[12],[15],[17],[22],[23]					1%	1%
Variable rate (percent)	[11],[12],[15],[17],[22],[23]					9%	9%
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[7]			$ 20,915
Floor rate (percent)	[2],[3],[5],[7]			1%	1%
Variable rate (percent)	[2],[3],[5],[7]			6.75%	6.75%
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services2
Schedule of Investments [Line Items]
Principal amount	[1],[2],[6],[7]			$ 2,688
Floor rate (percent)	[2],[5],[6],[7]			1%	1%
Variable rate (percent)	[2],[5],[6],[7]			6.75%	6.75%
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services3
Schedule of Investments [Line Items]
Principal amount	[1],[2],[6],[7]			$ 1,344
Floor rate (percent)	[2],[5],[6],[7]			1%	1%
Variable rate (percent)	[2],[5],[6],[7]			6.75%	6.75%
Investment, Identifier [Axis]: Cirque Du Soleil Holding USA Newco, Inc., Financial Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[4]			$ 6,387
Floor rate (percent)	[2],[3],[4],[5]			0.50%	0.50%
Variable rate (percent)	[2],[3],[4],[5]			4.25%	4.25%
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[7]			$ 35,000
Floor rate (percent)	[2],[3],[5],[7]			1%	1%
Variable rate (percent)	[2],[3],[5],[7]			7.65%	7.65%
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[17]					$ 39,000
Floor rate (percent)	[11],[12],[15],[17]					1%	1%
Variable rate (percent)	[11],[12],[15],[17]					7.65%	7.65%
Investment, Identifier [Axis]: Clear Channel Outdoor Holdings, Inc., Media & Entertainment
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[9]			$ 20,000
Variable rate (percent)	[2],[3],[5],[9]			3.50%	3.50%
Investment, Identifier [Axis]: Clydesdale Acquisition Holdings Inc., Financials Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 19,949
Floor rate (percent)	[2],[3],[5]			0.50%	0.50%
Variable rate (percent)	[2],[3],[5]			4.18%	4.18%
Investment, Identifier [Axis]: Compass Power Generation LLC, Power
Schedule of Investments [Line Items]
Principal amount	[10],[12]					$ 31,575
Floor rate (percent)	[12],[15]					1%	1%
Variable rate (percent)	[12],[15]					4.25%	4.25%
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[7],[24],[25]			$ 100,000
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Upstream
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[26],[27]					$ 100,000
Investment, Identifier [Axis]: Crown SubSea Communications Holding, Inc., Capital Goods 1
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[4]			$ 4,500
Floor rate (percent)	[2],[3],[4],[5]			0.80%	0.80%
Variable rate (percent)	[2],[3],[4],[5]			5%	5%
Investment, Identifier [Axis]: Crown SubSea Communications Holding, Inc., Capital Goods 2
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[4]			$ 5,430
Floor rate (percent)	[2],[3],[4],[5]			0.80%	0.80%
Variable rate (percent)	[2],[3],[4],[5]			5.25%	5.25%
Investment, Identifier [Axis]: EIF Van Hook Holdings, LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	[10],[12]					$ 26,882
Variable rate (percent)	[12],[15]					5.25%	5.25%
Investment, Identifier [Axis]: ERA II Minerals, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[17]					$ 37,000
Floor rate (percent)	[11],[12],[15],[17]					0.80%	0.80%
Variable rate (percent)	[11],[12],[15],[17]					6.25%	6.25%
Investment, Identifier [Axis]: Earthstone Energy Holdings, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[10],[12],[14]					$ 11,400
Investment, Identifier [Axis]: Endeavor Energy Resources, L.P., Upstream
Schedule of Investments [Line Items]
Principal amount	[10],[12],[17]					24,299
Investment, Identifier [Axis]: Engineered Machinery Holdings, Inc., Capital Goods
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 19,924
Floor rate (percent)	[2],[3],[5]			0.80%	0.80%
Variable rate (percent)	[2],[3],[5]			3.50%	3.50%
Investment, Identifier [Axis]: FR BR Holdings LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[17]					$ 81,582
Variable rate (percent)	[11],[12],[15],[17]					6.50%	6.50%
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[7]			$ 17,047
Floor rate (percent)	[2],[3],[5],[7]			0.50%	0.50%
Variable rate (percent)	[2],[3],[5],[7]			7.50%	7.50%
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12]					$ 17,347
Floor rate (percent)	[11],[12],[15]					0.50%	0.50%
Variable rate (percent)	[11],[12],[15]					7.50%	7.50%
Investment, Identifier [Axis]: First Brands Group, LLC, Automobiles & Components
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 19,905
Floor rate (percent)	[2],[3],[5]			1%	1%
Variable rate (percent)	[2],[3],[5]			5%	5%
Investment, Identifier [Axis]: Full House Resorts, Inc., Consumer Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 20,742
Investment, Identifier [Axis]: GIP II Blue Holding LP, Midstream
Schedule of Investments [Line Items]
Principal amount	[10],[12]					$ 5,918
Floor rate (percent)	[12],[15]					1%	1%
Variable rate (percent)	[12],[15]					4.50%	4.50%
Investment, Identifier [Axis]: GasLog Ltd., Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[7]			13,951
Investment, Identifier [Axis]: GasLog Ltd., Midstream
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[14]					$ 14,648
Variable rate (percent)	[11],[12],[14],[15]					7.75%	7.75%
Investment, Identifier [Axis]: Generation Bridge LLC, Power 1
Schedule of Investments [Line Items]
Principal amount	[10],[12]					$ 7,432
Floor rate (percent)	[12],[15]					0.80%	0.80%
Variable rate (percent)	[12],[15]					5%	5%
Investment, Identifier [Axis]: Generation Bridge LLC, Power 2
Schedule of Investments [Line Items]
Principal amount	[10],[12]					$ 163
Floor rate (percent)	[12],[15]					0.80%	0.80%
Variable rate (percent)	[12],[15]					5%	5%
Investment, Identifier [Axis]: Gold Rush Amusements, Inc., Consumer Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[7]			$ 30,673
Floor rate (percent)	[2],[3],[5],[7]			2%	2%
Variable rate (percent)	[2],[3],[5],[7]			7.50%	7.50%
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[7]			$ 14,516
Floor rate (percent)	[2],[3],[5],[7]			0.50%	0.50%
Variable rate (percent)	[2],[3],[5],[7]			7%	7%
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12]					$ 14,963
Floor rate (percent)	[11],[12],[15]					0.50%	0.50%
Variable rate (percent)	[11],[12],[15]					7.25%	7.25%
Investment, Identifier [Axis]: Guardian US Holdco, LLC, Financial Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 19,925
Floor rate (percent)	[2],[3],[5]			0.50%	0.50%
Variable rate (percent)	[2],[3],[5]			4%	4%
Investment, Identifier [Axis]: Guitar Center, Inc., Consumer Discretionary Distribution & Retail
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 20,000
Investment, Identifier [Axis]: Hamilton Intermediate Holdings, LLC, Power
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12]					$ 30,391
Investment, Identifier [Axis]: Hammerhead Resources Inc., Upstream
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[14],[17]					35,118
Investment, Identifier [Axis]: Knowlton Development Corporation Inc., Household & Personal Products
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 21,000
Variable rate (percent)	[2],[3],[5]			5%	5%
Investment, Identifier [Axis]: LABL, Inc., Commerical & Professional Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 19,864
Floor rate (percent)	[2],[3],[5]			0.50%	0.50%
Variable rate (percent)	[2],[3],[5]			5%	5%
Investment, Identifier [Axis]: Learning Care Group No. 2 Inc., Consumer Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 19,950
Floor rate (percent)	[2],[3],[5]			0.50%	0.50%
Variable rate (percent)	[2],[3],[5]			4.75%	4.75%
Investment, Identifier [Axis]: Mavis Tire Express Services TopCo, L.P., Consumer Discretionary Distribution & Retail
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 19,893
Floor rate (percent)	[2],[3],[5]			0.80%	0.80%
Variable rate (percent)	[2],[3],[5]			4%	4%
Investment, Identifier [Axis]: Medallion Midland Acquisition LP, Midstream
Schedule of Investments [Line Items]
Principal amount	[10],[12]					$ 7,920
Floor rate (percent)	[12],[15]					0.80%	0.80%
Variable rate (percent)	[12],[15]					3.75%	3.75%
Investment, Identifier [Axis]: Moss Creek Resources, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[10],[12],[17]					$ 11,693
Investment, Identifier [Axis]: NRG Energy, Inc., Power
Schedule of Investments [Line Items]
Principal amount	[10],[12],[14]					19,125
Investment, Identifier [Axis]: Navios Logistics Finance, Inc., Transportation
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[9]			$ 20,000
Investment, Identifier [Axis]: Nephron Pharmaceuticals Corp., Pharmaceuticals, Biotechnology & Life Sciences
Schedule of Investments [Line Items]
Principal amount	[1],[2],[7]			$ 20,000
Floor rate (percent)	[2],[5],[7]			1.50%	1.50%
Variable rate (percent)	[2],[5],[7]			9%	9%
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 1
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12]					$ 18,659
Floor rate (percent)	[11],[12],[15]					1%	1%
Variable rate (percent)	[11],[12],[15]					5.25%	5.25%
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 2
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[16]					$ 11,341
Floor rate (percent)	[11],[12],[15],[16]					1%	1%
Variable rate (percent)	[11],[12],[15],[16]					5.25%	5.25%
Investment, Identifier [Axis]: Oryx Midstream Services Permian Basin LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	[10],[12],[17]					$ 32,357
Floor rate (percent)	[12],[15],[17]					0.50%	0.50%
Variable rate (percent)	[12],[15],[17]					3.25%	3.25%
Investment, Identifier [Axis]: Parkway Generation LLC, Power 1
Schedule of Investments [Line Items]
Principal amount	[10],[12]					$ 5,760
Floor rate (percent)	[12],[15]					0.80%	0.80%
Variable rate (percent)	[12],[15]					4.75%	4.75%
Investment, Identifier [Axis]: Parkway Generation LLC, Power 2
Schedule of Investments [Line Items]
Principal amount	[10],[12]					$ 43,910
Floor rate (percent)	[12],[15]					0.80%	0.80%
Variable rate (percent)	[12],[15]					4.75%	4.75%
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 1
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[17]					$ 13,545
Floor rate (percent)	[11],[12],[15],[17]					1.50%	1.50%
Variable rate (percent)	[11],[12],[15],[17]					6.75%	6.75%
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 2
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[16]					$ 1,505
Floor rate (percent)	[11],[12],[15],[16]					1.50%	1.50%
Variable rate (percent)	[11],[12],[15],[16]					6.75%	6.75%
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[7],[28]			$ 4,864
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[17],[29]					$ 4,767
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 1
Schedule of Investments [Line Items]
Principal amount	[10],[12]					26,365
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 2
Schedule of Investments [Line Items]
Principal amount	[10],[12],[17]					5,200
Investment, Identifier [Axis]: Phoenix Guarantor Inc., Financial Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[4]			$ 19,923
Variable rate (percent)	[2],[3],[4],[5]			3.50%	3.50%
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 1
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12]					$ 9,370
Floor rate (percent)	[11],[12],[15]					1%	1%
Variable rate (percent)	[11],[12],[15]					6.75%	6.75%
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 2
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[16]					$ 2,477
Floor rate (percent)	[11],[12],[15],[16]					1%	1%
Variable rate (percent)	[11],[12],[15],[16]					6.75%	6.75%
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 1
Schedule of Investments [Line Items]
Principal amount	[1],[2],[7],[19],[20]			$ 13,297
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 2
Schedule of Investments [Line Items]
Principal amount	[1],[2],[7],[19],[20]			4,015
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Energy—Power
Schedule of Investments [Line Items]
Principal amount	[1],[2],[6],[7]			2,709
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Power
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[16]					$ 2,709
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 1
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[17]					12,121
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 2
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[17]					3,643
Investment, Identifier [Axis]: Potomac Energy Center, LLC, Power
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12]					$ 58,459
Floor rate (percent)	[11],[12],[15]					0.50%	0.50%
Variable rate (percent)	[11],[12],[15]					6%	6%
Investment, Identifier [Axis]: Pretium PKG Holdings, Inc., Materials
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 30,118
Floor rate (percent)	[2],[3],[5]			1%	1%
Variable rate (percent)	[2],[3],[5]			5%	5%
Investment, Identifier [Axis]: Pro Mach Group, Inc., Capital Goods
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 19,924
Floor rate (percent)	[2],[3],[5]			1%	1%
Variable rate (percent)	[2],[3],[5]			4%	4%
Investment, Identifier [Axis]: Proampac PG Borrower LLC, Materials
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 20,000
Floor rate (percent)	[2],[3],[5]			0.80%	0.80%
Variable rate (percent)	[2],[3],[5]			4.50%	4.50%
Investment, Identifier [Axis]: Ranger Oil Corp., Upstream
Schedule of Investments [Line Items]
Principal amount	[10],[12],[14]					$ 29,772
Investment, Identifier [Axis]: Realtruck Group, Inc., Automobiles & Components
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[4]			$ 19,956
Floor rate (percent)	[2],[3],[4],[5]			0.80%	0.80%
Variable rate (percent)	[2],[3],[4],[5]			3.50%	3.50%
Investment, Identifier [Axis]: Ryan, LLC, Commerical & Professional Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[4]			$ 9,844
Floor rate (percent)	[2],[3],[4],[5]			0.50%	0.50%
Variable rate (percent)	[2],[3],[4],[5]			4.50%	4.50%
Investment, Identifier [Axis]: Ryan, LLC, Commerical & Professional Services1
Schedule of Investments [Line Items]
Principal amount	[1],[2],[4],[6]			$ 1,036
Floor rate (percent)	[2],[4],[5],[6]			0.50%	0.50%
Investment, Identifier [Axis]: Ryan, LLC, Commerical & Professional Services2
Schedule of Investments [Line Items]
Variable rate (percent)	[2],[4],[5],[6]			4.50%	4.50%
Investment, Identifier [Axis]: SRS Distribution Inc., Capital Goods
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[4]			$ 19,924
Floor rate (percent)	[2],[3],[4],[5]			0.50%	0.50%
Variable rate (percent)	[2],[3],[4],[5]			3.50%	3.50%
Investment, Identifier [Axis]: ST EIP Holdings Inc., Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[7]			$ 10,365
Investment, Identifier [Axis]: ST EIP Holdings Inc., Midstream
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12]					10,526
Investment, Identifier [Axis]: SilverBow Resources, Inc., Upstream
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[14],[17]					$ 14,250
Floor rate (percent)	[11],[12],[14],[15],[17]					1%	1%
Variable rate (percent)	[11],[12],[14],[15],[17]					7.50%	7.50%
Investment, Identifier [Axis]: Sitio Royalties Operating Partnership, LP, Upstream
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[14],[17]					$ 19,500
Variable rate (percent)	[11],[12],[14],[15],[17]					6.50%	6.50%
Investment, Identifier [Axis]: Suburban Propane Partners LP, Midstream
Schedule of Investments [Line Items]
Principal amount	[10],[12],[14],[17]					$ 7,590
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Energy—Power
Schedule of Investments [Line Items]
Principal amount	[1],[2],[7],[9],[21]			60,603
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Power
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[14],[18]					60,603
Investment, Identifier [Axis]: TKC Holdings, Inc., Consumer Staples Distribution & Retail
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 19,650
Floor rate (percent)	[2],[3],[5]			1%	1%
Variable rate (percent)	[2],[3],[5]			5.50%	5.50%
Investment, Identifier [Axis]: Tallgrass Energy Partners, LP, Midstream
Schedule of Investments [Line Items]
Principal amount	[10],[12],[17]					19,761
Investment, Identifier [Axis]: Tenrgys, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[7]			$ 20,537
Floor rate (percent)	[2],[3],[5],[7]			1%	1%
Variable rate (percent)	[2],[3],[5],[7]			7.50%	7.50%
Investment, Identifier [Axis]: Tenrgys, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[17]					$ 20,537
Floor rate (percent)	[11],[12],[15],[17]					1%	1%
Variable rate (percent)	[11],[12],[15],[17]					7.50%	7.50%
Investment, Identifier [Axis]: Traverse Midstream Partners LLC, Midstream
Schedule of Investments [Line Items]
Principal amount	[10],[12]					$ 28,436
Floor rate (percent)	[12],[15]					1%	1%
Variable rate (percent)	[12],[15]					4.25%	4.25%
Investment, Identifier [Axis]: TruGreen, LP, Commercial & Professional Services
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3]			$ 19,910
Floor rate (percent)	[2],[3],[5]			0.80%	0.80%
Variable rate (percent)	[2],[3],[5]			4%	4%
Investment, Identifier [Axis]: U.S. Treasury Bill
Schedule of Investments [Line Items]
Principal amount	[2],[30]			$ 21,000
Investment, Identifier [Axis]: Warren Resources, Inc., Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[7],[21]			$ 23,823
Floor rate (percent)	[2],[3],[5],[7],[21]			1%	1%
Variable rate (percent)	[2],[3],[5],[7],[21]			9%	9%
Investment, Identifier [Axis]: Warren Resources, Inc., Upstream
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12],[18]					$ 23,584
Floor rate (percent)	[11],[12],[15],[18]					1%	1%
Variable rate (percent)	[11],[12],[15],[18]					9%	9%
Investment, Identifier [Axis]: Wattbridge Inc., Energy—Power
Schedule of Investments [Line Items]
Principal amount	[1],[2],[3],[7]			$ 42,938
Floor rate (percent)	[2],[3],[5],[7]			1.80%	1.80%
Variable rate (percent)	[2],[3],[5],[7]			9.85%	9.85%
Investment, Identifier [Axis]: Wattbridge Inc., Power
Schedule of Investments [Line Items]
Principal amount	[10],[11],[12]					$ 42,500
Floor rate (percent)	[11],[12],[15]					1.80%	1.80%
Variable rate (percent)	[11],[12],[15]					7.85%	7.85%
Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Aggregate sustainable infrastructure investments		$ 67,629	$ 5,430
Contributed capital to committed capital ratio		87.50%	87.50%
Percentage of voting control (percent)		50%	50%
Amount funded to joint venture				$ 43,150
Debt				145,483		$ 213,583
Sustainable Infrastructure Investments, LLC \| the Company and Imperial
Schedule of Investments [Line Items]
Amount funded to joint venture				49,313
Sustainable Infrastructure Investments, LLC \| Imperial
Schedule of Investments [Line Items]
Contributed capital to committed capital ratio		12.50%	12.50%
Percentage of voting control (percent)		50%	50%
Sustainable Infrastructure Investments, LLC \| FS Energy And Power Fund
Schedule of Investments [Line Items]
Sustainable infrastructure investments, LLC entitled to a fee percentage		0.25%	0.25%
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Alianca Transportadora de Gas Participacoes S.A., Midstream
Schedule of Investments [Line Items]
Principal amount						$ 73,707
Variable rate (percent)						2.60%	2.60%
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Blue Heron Intermediate Holdco I, LLC, Midstream
Schedule of Investments [Line Items]
Principal amount				$ 30,661		$ 31,832
Variable rate (percent)				1.88%	1.88%	1.88%	1.88%
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Cedar Creek II LLC, Renewables
Schedule of Investments [Line Items]
Principal amount						$ 8,710
Variable rate (percent)						1.88%	1.88%
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Copper Mountain Solar 3, LLC, Renewables
Schedule of Investments [Line Items]
Principal amount				$ 16,104		$ 17,804
Variable rate (percent)				1.88%	1.88%	1.75%	1.75%
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: FLNG Liquefaction 2, LLC, Midstream
Schedule of Investments [Line Items]
Principal amount				$ 26,567		$ 28,170
Variable rate (percent)				1.50%	1.50%	1.50%	1.50%
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Meikle Wind Energy, LP, Renewables
Schedule of Investments [Line Items]
Principal amount							$ 16,030
Variable rate (percent)						1.50%	1.50%
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: NES Hercules Class B Member, LLC, Renewables
Schedule of Investments [Line Items]
Principal amount				$ 24,176		$ 24,487
Variable rate (percent)				1.63%	1.63%	1.50%	1.50%
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: ST EIP Holdco LLC, Midstream
Schedule of Investments [Line Items]
Principal amount				$ 57,227		$ 58,673
Variable rate (percent)				2.50%	2.50%	2.50%	2.50%
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Seine Funding, LLC
Schedule of Investments [Line Items]
Principal amount		$ 634,103
Floor rate (percent)		0%
Variable rate (percent)		1.20%
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Top of the World Wind Energy LLC, Renewables
Schedule of Investments [Line Items]
Principal amount				$ 15,348		$ 18,373
Variable rate (percent)				2.13%	2.13%	1.88%	1.88%
Senior Secured Loan
Schedule of Investments [Line Items]
Number of senior secured loan investments \| investment				5	5	6	6
Unfunded commitment with amortized cost				$ 11,232		$ 25,891
Partnership Interest \| Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Unfunded commitment with amortized cost				$ 18,989	$ 858	$ 7,625	$ 858
Non-Controlled/Affiliated
Schedule of Investments [Line Items]
Number of investments in portfolio companies \| company				4	4	6	6
Controlled/affiliated
Schedule of Investments [Line Items]
Number of investments in portfolio companies \| company				3	3	3	3

[1]Denominated in U.S. dollars, unless otherwise noted.[2]Security may be an obligation of one or more entities affiliated with the named company.[3]Security or portion thereof held within FSSL Finance BB AssetCo LLC, a wholly-owned subsidiary of the Company, and is pledged as collateral supporting the obligations outstanding under the repurchase facility with Barclays Bank PLC (see Note 9).[4]Security or portion thereof unsettled as of December 31, 2023.[5]Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of December 31, 2023, the one-month and three-month Secured Overnight Financing Rate, or SOFR, or S, was 5.35% and 5.33%, respectively, and the Overnight Bank Funding Rate, or OBFR, was 5.32%. SOFR based contracts may include a credit spread adjustment that is charged in addition to the base rate and basis point spread. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment. Variable rate securities with no floor rate use the respective benchmark rate in all cases. Portfolio Company Fair Value at December 31, 2021 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income (3) PIK Income (3) Dividend Income (3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC (4) $ 7,782 $ 654 $ — $ — $ — $ 8,436 $ — $ 654 $ — Allied Wireline Services, LLC 46,339 5,808 — — 11,741 63,888 316 5,808 — MECO IV Holdco, LLC 22,745 455 (23,200) — — — — 455 — Warren Resources, Inc. 23,688 237 (341) — — 23,584 2,620 237 — Sustainable Infrastructure Investments, LLC Sustainable Infrastructure Investments, LLC 50,770 — — — 328 51,098 — — 735 Equity/Other Allied Wireline Services, LLC, Common Equity — — — — 10,463 10,463 — — — Allied Wireline Services, LLC, Warrants — — — — — — — — — MECO IV Holdco, LLC, Class A-1 Units 4,181 — (18,060) 15,899 (2,020) — — — — Warren Resources, Inc., Common Equity 25,854 — — — 11,128 36,982 — — — $ 181,359 $ 7,154 $ (41,601) $ 15,899 $ 31,640 $ 194,451 $ 2,936 $ 7,154 $ 735 _____________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest, PIK and dividend income presented for the year ended December 31, 2022. (4) Security includes a partially unfunded commitment with amortized cost of $2,500 and fair value of $2,500. Portfolio Company Fair Value at December 31, 2022 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2023 Interest Income (3) PIK Income (3) Dividend Income (3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC $ 8,436 $ 138 $ (8,574) $ — $ — $ — $ 256 $ 139 $ — Allied Wireline Services, LLC 63,888 6,389 — — (48,077) 22,200 — 2,910 — Warren Resources, Inc. 23,584 239 — — — 23,823 3,464 179 — Sustainable Infrastructure Investments, LLC Sustainable Infrastructure Investments, LLC 51,098 — (11,364) — (307) 39,427 — — 8,324 Equity/Other Allied Wireline Services, LLC, Common Equity 10,463 — — — (10,463) — — — — Allied Wireline Services, LLC, Warrants — — — — — — — — — Warren Resources, Inc., Common Equity 36,982 — — — (21,416) 15,566 — — — $ 194,451 $ 6,766 $ (19,938) $ — $ (80,263) $ 101,016 $ 3,720 $ 3,228 $ 8,324 _____________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest, PIK and dividend income presented for the year ended December 31, 2023. Portfolio Company Fair Value at December 31, 2022 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2023 Interest Income (3) PIK Income (3) Senior Secured Loans—First Lien Permian Production Holdings, LLC $ 4,767 $ 231 $ — $ — $ (182) $ 4,816 $ 675 $ 97 Equity/Other GWP Midstream Holdco, LLC, Common Equity 5,044 — (3,112) 3,112 (3,383) 1,661 — — Harvest Oil & Gas Corp., Common Equity 810 — (641) — 102 271 — — Limetree Bay Energy, LLC, Class A Units 1,885 246 — (21,704) 19,573 — — — Permian Production Holdings, LLC, Common Equity 11,420 — — — (10,672) 748 — — Ridgeback Resources Inc., Common Equity 41,851 — (35,240) (11,359) 4,748 — — — Telpico, LLC, Common Equity — — — — — — — — $ 65,777 $ 477 $ (38,993) $ (29,951) $ 10,186 $ 7,496 $ 675 $ 97 _____________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest and PIK income presented for the year ended December 31, 2023. Portfolio Company Fair Value at December 31, 2021 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income (3) PIK Income (3) Fee Income (3) Dividend Income (3) Senior Secured Loans—First Lien Limetree Bay Energy, LLC $ 3,166 $ — $ (1,587) $ (12,756) $ 11,177 $ — $ — $ — $ — $ — Permian Production Holdings, LLC 7,889 697 (3,674) 551 (696) 4,767 570 105 — — Senior Secured Bonds Great Western Petroleum, LLC 58,055 96 (55,096) 1,087 (4,142) — 2,649 — 7,268 — Equity/Other Great Western Petroleum, LLC, Common Equity 40,731 — (84,871) 54,081 (9,941) — — — — — GWP Midstream Holdco, LLC, Common Equity — 6,681 — — (1,637) 5,044 — — — — Harvest Oil & Gas Corp., Common Equity 2,836 — (743) — (1,283) 810 — — — — Limetree Bay Energy, LLC, Class A Units 6,046 1,795 — — (5,956) 1,885 — — — — Permian Production Holdings, LLC, Common Equity 8,829 4 — — 2,587 11,420 — — — 1,726 Ridgeback Resources Inc., Common Equity 48,356 — (12,559) 173 5,881 41,851 — — — 3,691 Telpico, LLC, Common Equity — — — — — — — — — — $ 175,908 $ 9,273 $ (158,530) $ 43,136 $ (4,010) $ 65,777 $ 3,219 $ 105 $ 7,268 $ 5,417 _______________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest, PIK, fee and dividend income presented for the year ended December 31, 2022.

Investment Portfolio - Schedu_2

Investment Portfolio - Schedule of Investment Portfolio, at Fair Value and Percentage (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022
Schedule of Investments [Line Items]
Investments, at fair value	$ 1,523,196	[1],[2]	$ 2,047,115	[3]
All Industries \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	100%		100%
Energy—Upstream
Schedule of Investments [Line Items]
Investments, at fair value	$ 309,456		$ 854,974
Energy—Upstream \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	20%		42%
Energy—Midstream
Schedule of Investments [Line Items]
Investments, at fair value	$ 303,175		$ 646,488
Energy—Midstream \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	20%		32%
Consumer Services
Schedule of Investments [Line Items]
Investments, at fair value	$ 156,089		$ 0
Consumer Services \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	10%		0%
Capital Goods
Schedule of Investments [Line Items]
Investments, at fair value	$ 116,454		$ 0
Capital Goods \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	8%		0%
Financial Services
Schedule of Investments [Line Items]
Investments, at fair value	$ 83,197		$ 0
Financial Services \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	6%		0%
Health Care Equipment & Services
Schedule of Investments [Line Items]
Investments, at fair value	$ 73,105		$ 0
Health Care Equipment & Services \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	5%		0%
Energy—Power
Schedule of Investments [Line Items]
Investments, at fair value	$ 69,696		$ 386,007
Energy—Power \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	5%		19%
Commercial & Professional Services
Schedule of Investments [Line Items]
Investments, at fair value	$ 62,036		$ 12,508
Commercial & Professional Services \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	4%		0%
Materials
Schedule of Investments [Line Items]
Investments, at fair value	$ 49,653		$ 0
Materials \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	3%		0%
Automobiles & Components
Schedule of Investments [Line Items]
Investments, at fair value	$ 39,521		$ 0
Automobiles & Components \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	3%		0%
Consumer Discretionary Distribution & Retail
Schedule of Investments [Line Items]
Investments, at fair value	$ 37,428		$ 0
Consumer Discretionary Distribution & Retail \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	3%		0%
Energy—Service & Equipment
Schedule of Investments [Line Items]
Investments, at fair value	$ 33,734		$ 96,040
Energy—Service & Equipment \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	2%		5%
Transportation
Schedule of Investments [Line Items]
Investments, at fair value	$ 30,157		$ 0
Transportation \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	2%		0%
U.S. Treasury Bills
Schedule of Investments [Line Items]
Investments, at fair value	$ 21,000		$ 0
U.S. Treasury Bills \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	1%		0%
Household & Personal Products
Schedule of Investments [Line Items]
Investments, at fair value	$ 20,858		$ 0
Household & Personal Products \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	1%		0%
Insurance
Schedule of Investments [Line Items]
Investments, at fair value	$ 20,251		$ 0
Insurance \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	1%		0%
Media & Entertainment
Schedule of Investments [Line Items]
Investments, at fair value	$ 19,829		$ 0
Media & Entertainment \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	1%		0%
Pharmaceuticals, Biotechnology & Life Sciences
Schedule of Investments [Line Items]
Investments, at fair value	$ 19,300		$ 0
Pharmaceuticals, Biotechnology & Life Sciences \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	1%		0%
Consumer Staples Distribution & Retail
Schedule of Investments [Line Items]
Investments, at fair value	$ 18,830		$ 0
Consumer Staples Distribution & Retail \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	1%		0%
Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Investments, at fair value	$ 39,427		$ 51,098
Sustainable Infrastructure Investments, LLC \| Investment Owned, At Fair Value \| Industry Concentration Risk
Schedule of Investments [Line Items]
Percentage of Portfolio	3%		2%

[1]Security may be an obligation of one or more entities affiliated with the named company.[2]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.[3]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

Investment Portfolio - Schedu_3

Investment Portfolio - Schedule of Individual Loans in SIIJV’s portfolio (Details) $ in Thousands		Dec. 31, 2023 USD ($) portfolio_asset		Dec. 31, 2022 USD ($) portfolio_asset
Schedule of Investments [Line Items]
Total investment		$ 1,543,925	[1]	$ 1,922,940
Weighted average current interest rate on debt investments (percent)	[2],[3],[4],[5]			10%
Investment, Identifier [Axis]: AI Aqua Merger Sub, Inc., Capital Goods 1
Schedule of Investments [Line Items]
Total investment	[1],[6],[7]	16,398
Investment, Identifier [Axis]: AI Aqua Merger Sub, Inc., Capital Goods 2
Schedule of Investments [Line Items]
Total investment	[1],[7],[8]	3,452
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Energy—Power
Schedule of Investments [Line Items]
Total investment	[1],[9],[10],[11]	20,779
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 1
Schedule of Investments [Line Items]
Total investment	[4],[5],[12],[13]			$ 20,082
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 2
Schedule of Investments [Line Items]
Total investment	[3],[4],[5],[12],[13]			5,359
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Warrants, Strike: $1.00, Energy—Power
Schedule of Investments [Line Items]
Total investment	[1],[9],[10],[11],[14]	2,652
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Warrants, Strike: $1.00, Power
Schedule of Investments [Line Items]
Total investment	[4],[5],[12],[13],[15],[16],[17]			2,652
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Equity, Energy—Service & Equipment
Schedule of Investments [Line Items]
Total investment	[1],[9],[14]	6,944
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Equity, Service & Equipment
Schedule of Investments [Line Items]
Total investment	[4],[5],[15],[16],[17]			6,944
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Equity , Energy—Service & Equipment
Schedule of Investments [Line Items]
Total investment	[1],[9],[14],[18]	1,447
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Equity, Service & Equipment
Schedule of Investments [Line Items]
Total investment	[4],[5],[15],[16],[17]			1,447
Investment, Identifier [Axis]: Acrisure, LLC, Insurance
Schedule of Investments [Line Items]
Total investment	[1],[6]	20,033
Investment, Identifier [Axis]: Aethon III BR LLC, Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[17]			19,848
Investment, Identifier [Axis]: Aethon United BR LP, Upstream
Schedule of Investments [Line Items]
Total investment	[5],[17]			$ 40,500
Weighted average current interest rate on debt investments (percent)	[2],[5],[17]			8.30%
Investment, Identifier [Axis]: Aimbridge Acquisition Co. Inc., Consumer Services
Schedule of Investments [Line Items]
Total investment	[1],[6]	21,036
Investment, Identifier [Axis]: AirSwift Holdings, Ltd., Common Equity, Commercial & Professional Services
Schedule of Investments [Line Items]
Total investment	[1],[9],[11],[14]	6,029
Investment, Identifier [Axis]: Allegiant Travel Co., Transportation
Schedule of Investments [Line Items]
Total investment	[1],[11]	$ 9,614
Weighted average current interest rate on debt investments (percent)	[1],[11],[19]	7.30%
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 1
Schedule of Investments [Line Items]
Total investment	[4],[5],[17],[20]			$ 8,436
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 2
Schedule of Investments [Line Items]
Total investment	[3],[4],[5],[20]			2,500
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 1
Schedule of Investments [Line Items]
Total investment	[1],[6]	$ 9,841
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 2
Schedule of Investments [Line Items]
Total investment	[1],[6]	9,627
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity, Energy—Service & Equipment
Schedule of Investments [Line Items]
Total investment	[1],[9],[14],[21],[22]	1,527
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity, Service & Equipment
Schedule of Investments [Line Items]
Total investment	[4],[5],[15],[16],[17],[20],[23]			1,527
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Energy—Service & Equipment
Schedule of Investments [Line Items]
Total investment	[1],[9],[14],[22],[24]	70,277
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Service & Equipment
Schedule of Investments [Line Items]
Total investment	[4],[5],[17],[20]			63,888
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants, Energy—Service & Equipment
Schedule of Investments [Line Items]
Total investment	[1],[9],[14],[21],[22]	$ 0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants, Service & Equipment
Schedule of Investments [Line Items]
Total investment	[4],[5],[15],[16],[17],[20],[23]			0
Investment, Identifier [Axis]: Allspring Government Money Market Fund - Select Class, Money Market Fund
Schedule of Investments [Line Items]
Weighted average current interest rate on debt investments (percent)	[1],[19]	5.30%
Investment, Identifier [Axis]: American Auto Auction Group, LLC, Capital Goods
Schedule of Investments [Line Items]
Total investment	[1],[6]	$ 9,752
Investment, Identifier [Axis]: Archrock Partners, L.P., Midstream
Schedule of Investments [Line Items]
Total investment	[5],[13],[17]			$ 3,168
Weighted average current interest rate on debt investments (percent)	[2],[5],[13],[17]			6.30%
Investment, Identifier [Axis]: Arena Energy, LP, Contingent Value Rights, Energy—Upstream
Schedule of Investments [Line Items]
Total investment	[1],[9],[14]	351
Investment, Identifier [Axis]: Arena Energy, LP, Contingent Value Rights, Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[15],[16],[17]			$ 351
Investment, Identifier [Axis]: Aretec Escrow Issuer Inc., Financial Services
Schedule of Investments [Line Items]
Total investment	[1],[6]	$ 7,000
Weighted average current interest rate on debt investments (percent)	[1],[6],[19]	10%
Investment, Identifier [Axis]: Aretec Group, Inc., Financial Services
Schedule of Investments [Line Items]
Total investment	[1],[6],[7]	$ 9,071
Investment, Identifier [Axis]: Ascent Resources Utica Holdings, LLC, Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Total investment	[1],[9],[14],[21]	44,573
Investment, Identifier [Axis]: Ascent Resources Utica Holdings, LLC, Common Equity, Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[15],[16],[17],[23]			44,700
Investment, Identifier [Axis]: Auris Luxembourg III S.a r.l, Health Care Equipment & Services
Schedule of Investments [Line Items]
Total investment	[1],[6],[11]	19,912
Investment, Identifier [Axis]: Aveanna Healthcare LLC, Health Care Equipment & Services
Schedule of Investments [Line Items]
Total investment	[1],[6]	14,054
Investment, Identifier [Axis]: BCPE Empire Holdings, Inc., Consumer Services
Schedule of Investments [Line Items]
Total investment	[1],[6]	24,983
Investment, Identifier [Axis]: Brazos Delaware II LLC, Midstream
Schedule of Investments [Line Items]
Total investment	[5]			38,085
Investment, Identifier [Axis]: CCS-CMGC Holdings, Inc., Health Care Equipment & Services
Schedule of Investments [Line Items]
Total investment	[1],[6]	18,225
Investment, Identifier [Axis]: CPM Holdings, Inc., Capital Goods
Schedule of Investments [Line Items]
Total investment	[1],[6]	20,038
Investment, Identifier [Axis]: CPV Maryland, LLC, Power
Schedule of Investments [Line Items]
Total investment	[5]			14,146
Investment, Identifier [Axis]: CPV Shore Holdings LLC, Power
Schedule of Investments [Line Items]
Total investment	[5]			22,760
Investment, Identifier [Axis]: Charlotte Buyer, Inc., Health Care Equipment & Services
Schedule of Investments [Line Items]
Total investment	[1],[6],[7]	19,937
Investment, Identifier [Axis]: Cimarron Energy Holdco Inc., Common Equity, Service & Equipment
Schedule of Investments [Line Items]
Total investment	[4],[5],[15],[16],[17]			3,950
Investment, Identifier [Axis]: Cimarron Energy Holdco Inc., Participation Option, Service & Equipment
Schedule of Investments [Line Items]
Total investment	[4],[5],[15],[16],[17]			1,289
Investment, Identifier [Axis]: Cimarron Energy Inc., Service & Equipment
Schedule of Investments [Line Items]
Total investment	[4],[5],[16],[17],[25]			6,563
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services
Schedule of Investments [Line Items]
Total investment	[1],[6],[9]	20,915
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services2
Schedule of Investments [Line Items]
Total investment	[1],[8],[9]	2,688
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services3
Schedule of Investments [Line Items]
Total investment	[1],[8],[9]	1,344
Investment, Identifier [Axis]: Cirque Du Soleil Holding USA Newco, Inc., Financial Services
Schedule of Investments [Line Items]
Total investment	[1],[6],[7]	6,331
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Total investment	[1],[6],[9]	34,527
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[17]			38,440
Investment, Identifier [Axis]: Clear Channel Outdoor Holdings, Inc., Media & Entertainment
Schedule of Investments [Line Items]
Total investment	[1],[6],[11]	19,551
Investment, Identifier [Axis]: Clydesdale Acquisition Holdings Inc., Financials Services
Schedule of Investments [Line Items]
Total investment	[1],[6]	19,740
Investment, Identifier [Axis]: Compass Power Generation LLC, Power
Schedule of Investments [Line Items]
Total investment	[5]			30,712
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Energy—Upstream
Schedule of Investments [Line Items]
Total investment	[1],[9],[26],[27]	$ 1,129
Weighted average current interest rate on debt investments (percent)	[1],[9],[19],[26],[27]	12.90%
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[28],[29]			$ 11,081
Weighted average current interest rate on debt investments (percent)	[2],[4],[5],[28],[29]			12.90%
Investment, Identifier [Axis]: Crown SubSea Communications Holding, Inc., Capital Goods 1
Schedule of Investments [Line Items]
Total investment	[1],[6],[7]	$ 4,523
Investment, Identifier [Axis]: Crown SubSea Communications Holding, Inc., Capital Goods 2
Schedule of Investments [Line Items]
Total investment	[1],[6],[7]	5,445
Investment, Identifier [Axis]: EIF Van Hook Holdings, LLC, Midstream
Schedule of Investments [Line Items]
Total investment	[5]			$ 26,609
Investment, Identifier [Axis]: ERA II Minerals, LLC, Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[17]			36,601
Investment, Identifier [Axis]: Earthstone Energy Holdings, LLC, Upstream
Schedule of Investments [Line Items]
Total investment	[5],[13]			$ 11,400
Weighted average current interest rate on debt investments (percent)	[2],[5],[13]			8%
Investment, Identifier [Axis]: Endeavor Energy Resources, L.P., Upstream
Schedule of Investments [Line Items]
Total investment	[5],[17]			$ 25,388
Weighted average current interest rate on debt investments (percent)	[2],[5],[17]			5.80%
Investment, Identifier [Axis]: Engineered Machinery Holdings, Inc., Capital Goods
Schedule of Investments [Line Items]
Total investment	[1],[6]	19,847
Investment, Identifier [Axis]: FR BR Holdings LLC, Midstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[17]			$ 80,371
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Energy—Midstream
Schedule of Investments [Line Items]
Total investment	[1],[6],[9]	16,855
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Midstream
Schedule of Investments [Line Items]
Total investment	[4],[5]			17,103
Investment, Identifier [Axis]: First Brands Group, LLC, Automobiles & Components
Schedule of Investments [Line Items]
Total investment	[1],[6]	19,620
Investment, Identifier [Axis]: Full House Resorts, Inc., Consumer Services
Schedule of Investments [Line Items]
Total investment	[1],[6]	$ 18,561
Weighted average current interest rate on debt investments (percent)	[1],[6],[19]	8.30%
Investment, Identifier [Axis]: GIP II Blue Holding LP, Midstream
Schedule of Investments [Line Items]
Total investment	[5]			5,842
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity, Energy—Midstream
Schedule of Investments [Line Items]
Total investment	[1],[9],[14],[21],[30]	$ 6,681
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity, Midstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[15],[16],[17],[23],[31]			6,681
Investment, Identifier [Axis]: GasLog Ltd., Energy—Midstream
Schedule of Investments [Line Items]
Total investment	[1],[9]	$ 13,874
Weighted average current interest rate on debt investments (percent)	[1],[9],[19]	7.80%
Investment, Identifier [Axis]: GasLog Ltd., Midstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[13]			14,556
Investment, Identifier [Axis]: Generation Bridge LLC, Power 1
Schedule of Investments [Line Items]
Total investment	[5]			7,305
Investment, Identifier [Axis]: Generation Bridge LLC, Power 2
Schedule of Investments [Line Items]
Total investment	[5]			160
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Commercial & Professional Services 1
Schedule of Investments [Line Items]
Total investment	[1],[9],[14],[18]	$ 2,786
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Commercial & Professional Services 2
Schedule of Investments [Line Items]
Total investment	[1],[9],[14],[18],[24]	12,493
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Professional Services 1
Schedule of Investments [Line Items]
Total investment	[4],[5],[15],[16],[17]			2,786
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Professional Services 2
Schedule of Investments [Line Items]
Total investment	[4],[5],[15],[16],[17],[25]			12,493
Investment, Identifier [Axis]: Gold Rush Amusements, Inc., Consumer Services
Schedule of Investments [Line Items]
Total investment	[1],[6],[9]	30,079
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Energy—Midstream
Schedule of Investments [Line Items]
Total investment	[1],[6],[9]	14,326
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Midstream
Schedule of Investments [Line Items]
Total investment	[4],[5]			14,752
Investment, Identifier [Axis]: Guardian US Holdco, LLC, Financial Services
Schedule of Investments [Line Items]
Total investment	[1],[6]	19,922
Investment, Identifier [Axis]: Guitar Center, Inc., Consumer Discretionary Distribution & Retail
Schedule of Investments [Line Items]
Total investment	[1],[6]	$ 17,987
Weighted average current interest rate on debt investments (percent)	[1],[6],[19]	8.50%
Investment, Identifier [Axis]: Hamilton Intermediate Holdings, LLC, Power
Schedule of Investments [Line Items]
Total investment	[4],[5]			31,075
Investment, Identifier [Axis]: Hammerhead Resources Inc., Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[13],[17]			34,961
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Total investment	[1],[14],[30]	$ 14,418
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity, Upstream
Schedule of Investments [Line Items]
Total investment	[5],[15],[16],[17],[31]			15,059
Investment, Identifier [Axis]: Knowlton Development Corporation Inc., Household & Personal Products
Schedule of Investments [Line Items]
Total investment	[1],[6]	20,370
Investment, Identifier [Axis]: LABL, Inc., Commerical & Professional Services
Schedule of Investments [Line Items]
Total investment	[1],[6]	19,335
Investment, Identifier [Axis]: Learning Care Group No. 2 Inc., Consumer Services
Schedule of Investments [Line Items]
Total investment	[1],[6]	20,070
Investment, Identifier [Axis]: Limetree Bay Energy, LLC, Class A Units, Midstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[15],[16],[17],[31]			21,458
Investment, Identifier [Axis]: MB Precision Investment Holdings LLC, Class A-2 Units, Industrials
Schedule of Investments [Line Items]
Total investment	[4],[5],[15],[16],[17],[23]			490
Investment, Identifier [Axis]: Maverick Natural Resources, LLC, Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Total investment	[1],[9],[14],[21]	93,044
Investment, Identifier [Axis]: Maverick Natural Resources, LLC, Common Equity, Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[15],[17],[23]			138,208
Investment, Identifier [Axis]: Mavis Tire Express Services TopCo, L.P., Consumer Discretionary Distribution & Retail
Schedule of Investments [Line Items]
Total investment	[1],[6]	19,797
Investment, Identifier [Axis]: Medallion Midland Acquisition LP, Midstream
Schedule of Investments [Line Items]
Total investment	[5]			7,886
Investment, Identifier [Axis]: Moss Creek Resources, LLC, Upstream
Schedule of Investments [Line Items]
Total investment	[5],[17]			$ 10,358
Weighted average current interest rate on debt investments (percent)	[2],[5],[17]			7.50%
Investment, Identifier [Axis]: NGL Energy Partners, LP, Preferred Equity, Energy—Midstream
Schedule of Investments [Line Items]
Total investment	[1],[6],[9],[11],[14],[18],[24]	$ 157,633
Weighted average current interest rate on debt investments (percent)	[1],[6],[9],[11],[14],[18],[19],[24]	14.20%
Investment, Identifier [Axis]: NGL Energy Partners, LP, Preferred Equity, Midstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[13],[15],[16],[17],[25]			$ 157,633
Weighted average current interest rate on debt investments (percent)	[4],[5],[13],[15],[16],[17],[25]			14.20%
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $13.56, Energy—Midstream
Schedule of Investments [Line Items]
Total investment	[1],[9],[11],[14]	$ 630
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $13.56, Midstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[13],[16],[17]			$ 630
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $14.54, Energy—Midstream
Schedule of Investments [Line Items]
Total investment	[1],[9],[11],[14]	3,083
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $14.54, Midstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[13],[15],[16],[17]			3,083
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $16.27, Energy—Midstream
Schedule of Investments [Line Items]
Total investment	[1],[9],[11],[14]	576
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $16.27, Midstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[13],[15],[16],[17]			576
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $17.45, Energy—Midstream
Schedule of Investments [Line Items]
Total investment	[1],[9],[11],[14]	2,623
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $17.45, Midstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[13],[15],[16],[17]			2,623
Investment, Identifier [Axis]: NRG Energy, Inc., Power
Schedule of Investments [Line Items]
Total investment	[5],[13]			$ 18,668
Weighted average current interest rate on debt investments (percent)	[2],[5],[13]			3.90%
Investment, Identifier [Axis]: Navios Logistics Finance, Inc., Transportation
Schedule of Investments [Line Items]
Total investment	[1],[6],[11]	$ 19,680
Weighted average current interest rate on debt investments (percent)	[1],[6],[11],[19]	10.80%
Investment, Identifier [Axis]: Nephron Pharmaceuticals Corp., Pharmaceuticals, Biotechnology & Life Sciences
Schedule of Investments [Line Items]
Total investment	[1],[9]	$ 19,400
Investment, Identifier [Axis]: NuStar, Preferred Equity, Midstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[13],[15],[17]			$ 73,114
Weighted average current interest rate on debt investments (percent)	[4],[5],[13],[15],[17]			12.80%
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 1
Schedule of Investments [Line Items]
Total investment	[4],[5]			$ 18,579
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 2
Schedule of Investments [Line Items]
Total investment	[3],[4],[5]			11,341
Investment, Identifier [Axis]: Oryx Midstream Services Permian Basin LLC, Midstream
Schedule of Investments [Line Items]
Total investment	[5],[17]			32,220
Investment, Identifier [Axis]: Parkway Generation LLC, Power 1
Schedule of Investments [Line Items]
Total investment	[5]			5,708
Investment, Identifier [Axis]: Parkway Generation LLC, Power 2
Schedule of Investments [Line Items]
Total investment	[5]			43,513
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 1
Schedule of Investments [Line Items]
Total investment	[4],[5],[17]			13,528
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 2
Schedule of Investments [Line Items]
Total investment	[3],[4],[5]			1,505
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Total investment	[1],[9],[14],[21],[30]	5
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity, Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[17],[23],[31]			5
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Total investment	[1],[9],[30]	$ 4,497
Weighted average current interest rate on debt investments (percent)	[1],[9],[19],[30]	7%
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[17],[31]			$ 4,266
Weighted average current interest rate on debt investments (percent)	[2],[4],[5],[17],[31]			7%
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 1
Schedule of Investments [Line Items]
Total investment	[5]			$ 27,511
Weighted average current interest rate on debt investments (percent)	[2],[5]			7.80%
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 2
Schedule of Investments [Line Items]
Total investment	[5],[17]			$ 5,257
Weighted average current interest rate on debt investments (percent)	[2],[5],[17]			5.90%
Investment, Identifier [Axis]: Phoenix Guarantor Inc., Financial Services
Schedule of Investments [Line Items]
Total investment	[1],[6],[7]	$ 19,891
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 1
Schedule of Investments [Line Items]
Total investment	[4],[5]			$ 9,304
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 2
Schedule of Investments [Line Items]
Total investment	[3],[4],[5]			2,477
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 1
Schedule of Investments [Line Items]
Total investment	[1],[9],[14],[24]	$ 12,329
Weighted average current interest rate on debt investments (percent)	[1],[9],[14],[19],[24]	6%
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 2
Schedule of Investments [Line Items]
Total investment	[1],[9],[14],[24]	$ 3,827
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Energy—Power
Schedule of Investments [Line Items]
Total investment	[1],[8],[9]	$ 2,709
Weighted average current interest rate on debt investments (percent)	[1],[8],[9],[19]	10%
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Power
Schedule of Investments [Line Items]
Total investment	[3],[4],[5]			2,709
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 1
Schedule of Investments [Line Items]
Total investment	[4],[5],[17]			$ 12,121
Weighted average current interest rate on debt investments (percent)	[2],[4],[5],[17]			6%
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 2
Schedule of Investments [Line Items]
Total investment	[4],[5],[17]			$ 3,643
Investment, Identifier [Axis]: Potomac Energy Center, LLC, Power
Schedule of Investments [Line Items]
Total investment	[4],[5]			57,508
Investment, Identifier [Axis]: Pretium PKG Holdings, Inc., Materials
Schedule of Investments [Line Items]
Total investment	[1],[6]	$ 29,634
Investment, Identifier [Axis]: Pro Mach Group, Inc., Capital Goods
Schedule of Investments [Line Items]
Total investment	[1],[6]	19,979
Investment, Identifier [Axis]: Proampac PG Borrower LLC, Materials
Schedule of Investments [Line Items]
Total investment	[1],[6]	19,994
Investment, Identifier [Axis]: Ranger Oil Corp., Upstream
Schedule of Investments [Line Items]
Total investment	[5],[13]			$ 29,633
Weighted average current interest rate on debt investments (percent)	[2],[5],[13]			9.30%
Investment, Identifier [Axis]: Realtruck Group, Inc., Automobiles & Components
Schedule of Investments [Line Items]
Total investment	[1],[6],[7]	19,117
Investment, Identifier [Axis]: Ridgeback Resources Inc., Common Equity, Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[13],[17],[31],[32]			$ 46,599
Investment, Identifier [Axis]: Ryan, LLC, Commerical & Professional Services
Schedule of Investments [Line Items]
Total investment	[1],[6],[7]	9,868
Investment, Identifier [Axis]: Ryan, LLC, Commerical & Professional Services1
Schedule of Investments [Line Items]
Total investment	[1],[7],[8]	1,039
Investment, Identifier [Axis]: SRS Distribution Inc., Capital Goods
Schedule of Investments [Line Items]
Total investment	[1],[6],[7]	19,729
Investment, Identifier [Axis]: ST EIP Holdings Inc., Energy—Midstream
Schedule of Investments [Line Items]
Total investment	[1],[6],[9]	$ 9,951
Weighted average current interest rate on debt investments (percent)	[1],[6],[9],[19]	6.30%
Investment, Identifier [Axis]: ST EIP Holdings Inc., Midstream
Schedule of Investments [Line Items]
Total investment	[4],[5]			$ 10,064
Weighted average current interest rate on debt investments (percent)	[2],[4],[5]			6.30%
Investment, Identifier [Axis]: Segreto Power Holdings, LLC, Preferred Equity, Power
Schedule of Investments [Line Items]
Total investment	[4],[5],[15],[16],[17],[23],[25]			$ 99,766
Weighted average current interest rate on debt investments (percent)	[4],[5],[15],[16],[17],[23],[25]			13.10%
Investment, Identifier [Axis]: SilverBow Resources, Inc., Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[13],[17]			$ 14,199
Investment, Identifier [Axis]: Sitio Royalties Operating Partnership, LP, Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[13],[17]			19,318
Investment, Identifier [Axis]: Suburban Propane Partners LP, Midstream
Schedule of Investments [Line Items]
Total investment	[5],[13],[17]			$ 7,837
Weighted average current interest rate on debt investments (percent)	[2],[5],[13],[17]			5%
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Energy—Power
Schedule of Investments [Line Items]
Total investment	[1],[9],[11],[22]	$ 43,150
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Power
Schedule of Investments [Line Items]
Total investment	[4],[5],[13],[20]			$ 54,514
Investment, Identifier [Axis]: Swift Worldwide Resources Holdco Limited, Common Equity, Commercial & Professional Services
Schedule of Investments [Line Items]
Total investment	[4],[5],[13],[16],[17],[33]			6,029
Investment, Identifier [Axis]: TKC Holdings, Inc., Consumer Staples Distribution & Retail
Schedule of Investments [Line Items]
Total investment	[1],[6]	18,681
Investment, Identifier [Axis]: Tallgrass Energy Partners, LP, Midstream
Schedule of Investments [Line Items]
Total investment	[5],[17]			$ 19,676
Weighted average current interest rate on debt investments (percent)	[2],[5],[17]			6%
Investment, Identifier [Axis]: Telpico, LLC, Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Total investment	[1],[9],[14],[21],[30]	0
Investment, Identifier [Axis]: Telpico, LLC, Common Equity, Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[16],[17],[23],[31]			$ 0
Investment, Identifier [Axis]: Tenrgys, LLC, Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Total investment	[1],[9],[14],[21]	7,571
Investment, Identifier [Axis]: Tenrgys, LLC, Common Equity, Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[16],[17],[23]			7,571
Investment, Identifier [Axis]: Tenrgys, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Total investment	[1],[6],[9]	20,537
Investment, Identifier [Axis]: Tenrgys, LLC, Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[17]			20,537
Investment, Identifier [Axis]: Traverse Midstream Partners LLC, Midstream
Schedule of Investments [Line Items]
Total investment	[5]			28,484
Investment, Identifier [Axis]: TruGreen, LP, Commercial & Professional Services
Schedule of Investments [Line Items]
Total investment	[1],[6]	18,614
Investment, Identifier [Axis]: U.S. Treasury Bill
Schedule of Investments [Line Items]
Total investment	[1],[34]	20,994
Investment, Identifier [Axis]: USA Compression Partners, LP, Common Equity, Midstream
Schedule of Investments [Line Items]
Total investment	[5],[13],[16],[17]			1,617
Investment, Identifier [Axis]: USA Compression Partners, LP, Preferred Equity, Energy—Midstream
Schedule of Investments [Line Items]
Total investment	[1],[6],[9],[11],[18]	$ 78,091
Weighted average current interest rate on debt investments (percent)	[1],[6],[9],[11],[18],[19]	9.80%
Investment, Identifier [Axis]: USA Compression Partners, LP, Preferred Equity, Midstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[13],[15]			$ 77,943
Weighted average current interest rate on debt investments (percent)	[4],[5],[13],[15]			9.80%
Investment, Identifier [Axis]: USA Compression Partners, LP, Warrants (Premium), Strike: $19.59, Midstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[13],[16],[17]			$ 714
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Total investment	[1],[9],[14],[22]	$ 20,754
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity, Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[16],[17],[20]			20,754
Investment, Identifier [Axis]: Warren Resources, Inc., Energy—Upstream
Schedule of Investments [Line Items]
Total investment	[1],[6],[9],[22]	23,823
Investment, Identifier [Axis]: Warren Resources, Inc., Upstream
Schedule of Investments [Line Items]
Total investment	[4],[5],[20]			23,584
Investment, Identifier [Axis]: Wattbridge Inc., Energy—Power
Schedule of Investments [Line Items]
Total investment	[1],[6],[9]	42,938
Investment, Identifier [Axis]: Wattbridge Inc., Power
Schedule of Investments [Line Items]
Total investment	[4],[5]			42,500
Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Total investment		$ 170,083		$ 274,088
Number of portfolio assets in SIIJV \| portfolio_asset		6		9
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Alianca Transportadora de Gas Participacoes S.A., Midstream
Schedule of Investments [Line Items]
Total investment				$ 73,707
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Blue Heron Intermediate Holdco I, LLC, Midstream
Schedule of Investments [Line Items]
Total investment		$ 30,661		31,832
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Cedar Creek II LLC, Renewables
Schedule of Investments [Line Items]
Total investment				8,710
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Copper Mountain Solar 3, LLC, Renewables
Schedule of Investments [Line Items]
Total investment		16,104		17,804
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: FLNG Liquefaction 2, LLC, Midstream
Schedule of Investments [Line Items]
Total investment		26,567		28,170
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Largest Portfolio Company Investment
Schedule of Investments [Line Items]
Total investment		57,227		73,707
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Meikle Wind Energy, LP, Renewables
Schedule of Investments [Line Items]
Total investment				12,332
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: NES Hercules Class B Member, LLC, Renewables
Schedule of Investments [Line Items]
Total investment		24,176		24,487
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: ST EIP Holdco LLC, Midstream
Schedule of Investments [Line Items]
Total investment		57,227		58,673
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Top of the World Wind Energy LLC, Renewables
Schedule of Investments [Line Items]
Total investment		$ 15,348		$ 18,373
Sustainable Infrastructure Investments, LLC \| Weighted Average
Schedule of Investments [Line Items]
Weighted average current interest rate on debt investments (percent)		7.45%		6.96%

[1]Security may be an obligation of one or more entities affiliated with the named company.[2]Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of December 31, 2022, the three-month London Interbank Offered Rate, or LIBOR, or L, was 4.77% and the Secured Overnight Financing Rate, or SOFR, or S, was 4.59%. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment. Variable rate securities with no floor rate use the respective benchmark rate in all cases.[3]Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.[4]Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).[5]Security may be an obligation of one or more entities affiliated with the named company.[6]Security or portion thereof held within FSSL Finance BB AssetCo LLC, a wholly-owned subsidiary of the Company, and is pledged as collateral supporting the obligations outstanding under the repurchase facility with Barclays Bank PLC (see Note 9).[7]Security or portion thereof unsettled as of December 31, 2023.[8]Security is an unfunded commitment. The stated rate reflects the spread disclosed at the time of commitment and may not indicate the actual rate received upon funding.[9]Security is classified as Level 3 in the Company’s fair value hierarchy (see Note 8).[10]Security or portion thereof held within FS Power Investments II, LLC, a wholly-owned subsidiary of the Company.[11]The investment is not a qualifying asset under the Investment Company Act of 1940, as amended, or the 1940 Act. A business development company may not acquire any asset other than a qualifying asset, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the business development company’s total assets. As of December 31, 2023, 80.8% of the Company’s total assets represented qualifying assets.[12]Security or portion thereof held within FS Power Investments II, LLC, a wholly-owned subsidiary of the Company.[13]The investment is not a qualifying asset under the Investment Company Act of 1940, as amended, or the 1940 Act. A business development company may not acquire any asset other than a qualifying asset, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the business development company’s total assets. As of December 31, 2022, 77.5% of the Company’s total assets represented qualifying assets.[14]Security is non-income producing.[15]Listed investments may be treated as debt for U.S. generally accepted accounting principles, or GAAP, or tax purposes.[16]Security is non-income producing.[17]Security or portion thereof is pledged as collateral supporting the amounts outstanding under the Senior Secured Notes with JPMorgan Chase Bank, N.A. (see Note 9).[18]Listed investments may be treated as debt for U.S. generally accepted accounting principles, or GAAP, or tax purposes.[19]Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of December 31, 2023, the one-month and three-month Secured Overnight Financing Rate, or SOFR, or S, was 5.35% and 5.33%, respectively, and the Overnight Bank Funding Rate, or OBFR, was 5.32%. SOFR based contracts may include a credit spread adjustment that is charged in addition to the base rate and basis point spread. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment. Variable rate securities with no floor rate use the respective benchmark rate in all cases. Portfolio Company Fair Value at December 31, 2021 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income (3) PIK Income (3) Dividend Income (3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC (4) $ 7,782 $ 654 $ — $ — $ — $ 8,436 $ — $ 654 $ — Allied Wireline Services, LLC 46,339 5,808 — — 11,741 63,888 316 5,808 — MECO IV Holdco, LLC 22,745 455 (23,200) — — — — 455 — Warren Resources, Inc. 23,688 237 (341) — — 23,584 2,620 237 — Sustainable Infrastructure Investments, LLC Sustainable Infrastructure Investments, LLC 50,770 — — — 328 51,098 — — 735 Equity/Other Allied Wireline Services, LLC, Common Equity — — — — 10,463 10,463 — — — Allied Wireline Services, LLC, Warrants — — — — — — — — — MECO IV Holdco, LLC, Class A-1 Units 4,181 — (18,060) 15,899 (2,020) — — — — Warren Resources, Inc., Common Equity 25,854 — — — 11,128 36,982 — — — $ 181,359 $ 7,154 $ (41,601) $ 15,899 $ 31,640 $ 194,451 $ 2,936 $ 7,154 $ 735 _____________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest, PIK and dividend income presented for the year ended December 31, 2022. (4) Security includes a partially unfunded commitment with amortized cost of $2,500 and fair value of $2,500. Portfolio Company Fair Value at December 31, 2022 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2023 Interest Income (3) PIK Income (3) Dividend Income (3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC $ 8,436 $ 138 $ (8,574) $ — $ — $ — $ 256 $ 139 $ — Allied Wireline Services, LLC 63,888 6,389 — — (48,077) 22,200 — 2,910 — Warren Resources, Inc. 23,584 239 — — — 23,823 3,464 179 — Sustainable Infrastructure Investments, LLC Sustainable Infrastructure Investments, LLC 51,098 — (11,364) — (307) 39,427 — — 8,324 Equity/Other Allied Wireline Services, LLC, Common Equity 10,463 — — — (10,463) — — — — Allied Wireline Services, LLC, Warrants — — — — — — — — — Warren Resources, Inc., Common Equity 36,982 — — — (21,416) 15,566 — — — $ 194,451 $ 6,766 $ (19,938) $ — $ (80,263) $ 101,016 $ 3,720 $ 3,228 $ 8,324 _____________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest, PIK and dividend income presented for the year ended December 31, 2023. Portfolio Company Fair Value at December 31, 2022 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2023 Interest Income (3) PIK Income (3) Senior Secured Loans—First Lien Permian Production Holdings, LLC $ 4,767 $ 231 $ — $ — $ (182) $ 4,816 $ 675 $ 97 Equity/Other GWP Midstream Holdco, LLC, Common Equity 5,044 — (3,112) 3,112 (3,383) 1,661 — — Harvest Oil & Gas Corp., Common Equity 810 — (641) — 102 271 — — Limetree Bay Energy, LLC, Class A Units 1,885 246 — (21,704) 19,573 — — — Permian Production Holdings, LLC, Common Equity 11,420 — — — (10,672) 748 — — Ridgeback Resources Inc., Common Equity 41,851 — (35,240) (11,359) 4,748 — — — Telpico, LLC, Common Equity — — — — — — — — $ 65,777 $ 477 $ (38,993) $ (29,951) $ 10,186 $ 7,496 $ 675 $ 97 _____________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest and PIK income presented for the year ended December 31, 2023. Portfolio Company Fair Value at December 31, 2021 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income (3) PIK Income (3) Fee Income (3) Dividend Income (3) Senior Secured Loans—First Lien Limetree Bay Energy, LLC $ 3,166 $ — $ (1,587) $ (12,756) $ 11,177 $ — $ — $ — $ — $ — Permian Production Holdings, LLC 7,889 697 (3,674) 551 (696) 4,767 570 105 — — Senior Secured Bonds Great Western Petroleum, LLC 58,055 96 (55,096) 1,087 (4,142) — 2,649 — 7,268 — Equity/Other Great Western Petroleum, LLC, Common Equity 40,731 — (84,871) 54,081 (9,941) — — — — — GWP Midstream Holdco, LLC, Common Equity — 6,681 — — (1,637) 5,044 — — — — Harvest Oil & Gas Corp., Common Equity 2,836 — (743) — (1,283) 810 — — — — Limetree Bay Energy, LLC, Class A Units 6,046 1,795 — — (5,956) 1,885 — — — — Permian Production Holdings, LLC, Common Equity 8,829 4 — — 2,587 11,420 — — — 1,726 Ridgeback Resources Inc., Common Equity 48,356 — (12,559) 173 5,881 41,851 — — — 3,691 Telpico, LLC, Common Equity — — — — — — — — — — $ 175,908 $ 9,273 $ (158,530) $ 43,136 $ (4,010) $ 65,777 $ 3,219 $ 105 $ 7,268 $ 5,417 _______________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest, PIK, fee and dividend income presented for the year ended December 31, 2022.

Investment Portfolio - Schedu_4

Investment Portfolio - Schedule of Sustainable Infrastructure Investments, LLC Portfolio (Details) $ in Thousands, $ in Thousands		Dec. 31, 2023 USD ($)		Dec. 31, 2022 USD ($)		Dec. 31, 2022 CAD ($)		Dec. 31, 2021 USD ($)	Jan. 02, 2020 USD ($)
Schedule of Investments [Line Items]
Amortized Cost		$ 1,543,925	[1]	$ 1,922,940
Investments, at fair value		$ 1,523,196	[1],[2]	$ 2,047,115	[3]
Percent of net assets (percent)		97.50%	[1]	116.70%		116.70%
Three-month SOFR
Schedule of Investments [Line Items]
Investment, variable rate (percent)				4.59%		4.59%
Three-month LIBOR
Schedule of Investments [Line Items]
Investment, variable rate (percent)				4.77%		4.77%
Canadian Dollar Offer Rate
Schedule of Investments [Line Items]
Investment, variable rate (percent)				4.94%		4.94%
Senior Secured Loans—First Lien
Schedule of Investments [Line Items]
Amortized Cost		$ 878,013	[1]	$ 702,842	[4]
Investments, at fair value		$ 825,158	[1],[2]	$ 706,646	[3],[4]
Percent of net assets (percent)		52.90%	[1]	40.30%	[4]	40.30%	[4]
Investment, Identifier [Axis]: AI Aqua Merger Sub, Inc., Capital Goods 1
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[7]	4.25%
Principal amount	[1],[6],[7],[8]	$ 16,522
Amortized Cost	[1],[6],[7]	16,398
Investments, at fair value	[1],[2],[6],[7]	$ 16,625
Investment, Identifier [Axis]: AI Aqua Merger Sub, Inc., Capital Goods 2
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[7],[9]	4.25%
Principal amount	[1],[7],[8],[9]	$ 3,478
Amortized Cost	[1],[7],[9]	3,452
Investments, at fair value	[1],[2],[7],[9]	$ 3,500
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Energy—Power
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[10],[11],[12]	4%
Principal amount	[1],[8],[10],[11],[12]	$ 22,856
Amortized Cost	[1],[10],[11],[12]	20,779
Investments, at fair value	[1],[2],[10],[11],[12]	23,050
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 1
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14],[15],[16]			4%		4%
Principal amount	[4],[14],[15],[16],[17]			$ 22,734
Amortized Cost	[4],[14],[15],[16]			20,082
Investments, at fair value	[3],[4],[14],[15],[16]			$ 23,519
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Power 2
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14],[15],[16],[18]			4%		4%
Principal amount	[4],[14],[15],[16],[17],[18]			$ 5,359
Amortized Cost	[4],[14],[15],[16],[18]			5,359
Investments, at fair value	[3],[4],[14],[15],[16],[18]			5,545
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Warrants, Strike: $1.00, Energy—Power
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[11],[12],[19]	2,652
Investments, at fair value	[1],[2],[10],[11],[12],[19]	0
Investment, Identifier [Axis]: AIRRO (Mauritius) Holdings II, Warrants, Strike: $1.00, Power
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[15],[16],[20],[21],[22]			2,652
Investments, at fair value	[3],[4],[14],[15],[16],[20],[21],[22]			1,630
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Equity, Energy—Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[19]	6,944
Investments, at fair value	[1],[2],[10],[19]	1,375
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Common Equity, Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[20],[21],[22]			6,944
Investments, at fair value	[3],[4],[14],[20],[21],[22]			1,219
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Equity , Energy—Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[19],[23]	1,447
Investments, at fair value	[1],[2],[10],[19],[23]	$ 10,159
Investment, Identifier [Axis]: Abaco Energy Technologies LLC, Preferred Equity, Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[20],[21],[22]			1,447
Investments, at fair value	[3],[4],[14],[20],[21],[22]			$ 8,321
Investment, Identifier [Axis]: Acrisure, LLC, Insurance
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	4.50%
Principal amount	[1],[6],[8]	$ 20,175
Amortized Cost	[1],[6]	20,033
Investments, at fair value	[1],[2],[6]	$ 20,251
Investment, Identifier [Axis]: Aethon III BR LLC, Upstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14],[22]			7.50%		7.50%
Principal amount	[4],[14],[17],[22]			$ 20,000
Amortized Cost	[4],[14],[22]			19,848
Investments, at fair value	[3],[4],[14],[22]			20,138
Investment, Identifier [Axis]: Aethon United BR LP, Upstream
Schedule of Investments [Line Items]
Principal amount	[4],[17],[22]			40,500
Amortized Cost	[4],[22]			40,500
Investments, at fair value	[3],[4],[22]			40,221
Investment, Identifier [Axis]: Aimbridge Acquisition Co. Inc., Consumer Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	3.75%
Principal amount	[1],[6],[8]	$ 21,805
Amortized Cost	[1],[6]	21,036
Investments, at fair value	[1],[2],[6]	20,380
Investment, Identifier [Axis]: AirSwift Holdings, Ltd., Common Equity, Commercial & Professional Services
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[12],[19]	6,029
Investments, at fair value	[1],[2],[10],[12],[19]	3,413
Investment, Identifier [Axis]: Allegiant Travel Co., Transportation
Schedule of Investments [Line Items]
Principal amount	[1],[8],[12]	10,601
Amortized Cost	[1],[12]	9,614
Investments, at fair value	[1],[2],[12]	10,385
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC
Schedule of Investments [Line Items]
Investments, at fair value		$ 0		8,436				$ 7,782
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 1
Schedule of Investments [Line Items]
Principal amount	[4],[14],[17],[22],[24]			8,436
Amortized Cost	[4],[14],[22],[24]			8,436
Investments, at fair value	[3],[4],[14],[22],[24]			8,436
Investment, Identifier [Axis]: Allied Downhole Technologies, LLC, Service & Equipment 2
Schedule of Investments [Line Items]
Principal amount	[4],[14],[17],[18],[24]			2,500
Amortized Cost	[4],[14],[18],[24]			2,500
Investments, at fair value	[3],[4],[14],[18],[24]			2,500
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 1
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	4.75%
Principal amount	[1],[6],[8]	$ 9,975
Amortized Cost	[1],[6]	9,841
Investments, at fair value	[1],[2],[6]	$ 9,998
Investment, Identifier [Axis]: Allied Universal Holdco LLC, Consumer Services 2
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	3.75%
Principal amount	[1],[6],[8]	$ 9,929
Amortized Cost	[1],[6]	9,627
Investments, at fair value	[1],[2],[6]	9,903
Investment, Identifier [Axis]: Allied Wireline Services, LLC
Schedule of Investments [Line Items]
Investments, at fair value		22,200		63,888				46,339
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity
Schedule of Investments [Line Items]
Investments, at fair value		0		10,463				0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity, Energy—Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[19],[25],[26]	1,527
Investments, at fair value	[1],[2],[10],[19],[25],[26]	0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Common Equity, Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[20],[21],[22],[24],[27]			1,527
Investments, at fair value	[3],[4],[14],[20],[21],[22],[24],[27]			10,463
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Energy—Service & Equipment
Schedule of Investments [Line Items]
Principal amount	[1],[8],[10],[19],[26],[28]	70,277
Amortized Cost	[1],[10],[19],[26],[28]	70,277
Investments, at fair value	[1],[2],[10],[19],[26],[28]	22,200
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Service & Equipment
Schedule of Investments [Line Items]
Principal amount	[4],[14],[17],[22],[24]			63,888
Amortized Cost	[4],[14],[22],[24]			63,888
Investments, at fair value	[3],[4],[14],[22],[24]			63,888
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants
Schedule of Investments [Line Items]
Investments, at fair value		0		0				0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants, Energy—Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[19],[25],[26]	0
Investments, at fair value	[1],[2],[10],[19],[25],[26]	0
Investment, Identifier [Axis]: Allied Wireline Services, LLC, Warrants, Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[20],[21],[22],[24],[27]			0
Investments, at fair value	[3],[4],[14],[20],[21],[22],[24],[27]			0
Investment, Identifier [Axis]: Allspring Government Money Market Fund - Select Class, Money Market Fund
Schedule of Investments [Line Items]
Investments, at fair value	[1],[2]	$ 23,098
Investment, Identifier [Axis]: American Auto Auction Group, LLC, Capital Goods
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	5%
Principal amount	[1],[6],[8]	$ 9,975
Amortized Cost	[1],[6]	9,752
Investments, at fair value	[1],[2],[6]	9,858
Investment, Identifier [Axis]: Archrock Partners, L.P., Midstream
Schedule of Investments [Line Items]
Principal amount	[4],[16],[17],[22]			3,098
Amortized Cost	[4],[16],[22]			3,168
Investments, at fair value	[3],[4],[16],[22]			2,840
Investment, Identifier [Axis]: Arena Energy, LP, Contingent Value Rights, Energy—Upstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[19]	351
Investments, at fair value	[1],[2],[10],[19]	571
Investment, Identifier [Axis]: Arena Energy, LP, Contingent Value Rights, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[20],[21],[22]			351
Investments, at fair value	[3],[4],[14],[20],[21],[22]			858
Investment, Identifier [Axis]: Aretec Escrow Issuer Inc., Financial Services
Schedule of Investments [Line Items]
Principal amount	[1],[6],[8]	7,000
Amortized Cost	[1],[6]	7,000
Investments, at fair value	[1],[2],[6]	$ 7,447
Investment, Identifier [Axis]: Aretec Group, Inc., Financial Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[7]	4.50%
Principal amount	[1],[6],[7],[8]	$ 9,352
Amortized Cost	[1],[6],[7]	9,071
Investments, at fair value	[1],[2],[6],[7]	9,358
Investment, Identifier [Axis]: Ascent Resources Utica Holdings, LLC, Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[19],[25]	44,573
Investments, at fair value	[1],[2],[10],[19],[25]	$ 39,545
Investment, Identifier [Axis]: Ascent Resources Utica Holdings, LLC, Common Equity, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[20],[21],[22],[27]			44,700
Investments, at fair value	[3],[4],[14],[20],[21],[22],[27]			$ 52,340
Investment, Identifier [Axis]: Auris Luxembourg III S.a r.l, Health Care Equipment & Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[12]	3.75%
Principal amount	[1],[6],[8],[12]	$ 20,287
Amortized Cost	[1],[6],[12]	19,912
Investments, at fair value	[1],[2],[6],[12]	$ 20,079
Investment, Identifier [Axis]: Aveanna Healthcare LLC, Health Care Equipment & Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	3.75%
Principal amount	[1],[6],[8]	$ 15,909
Amortized Cost	[1],[6]	14,054
Investments, at fair value	[1],[2],[6]	$ 14,852
Investment, Identifier [Axis]: BCPE Empire Holdings, Inc., Consumer Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	4.75%
Principal amount	[1],[6],[8]	$ 24,900
Amortized Cost	[1],[6]	24,983
Investments, at fair value	[1],[2],[6]	$ 24,998
Investment, Identifier [Axis]: Brazos Delaware II LLC, Midstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13]			4%		4%
Principal amount	[4],[17]			$ 39,259
Amortized Cost	[4]			38,085
Investments, at fair value	[3],[4]			$ 39,137
Investment, Identifier [Axis]: CCS-CMGC Holdings, Inc., Health Care Equipment & Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	5.50%
Principal amount	[1],[6],[8]	$ 21,465
Amortized Cost	[1],[6]	18,225
Investments, at fair value	[1],[2],[6]	$ 18,222
Investment, Identifier [Axis]: CPM Holdings, Inc., Capital Goods
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	4.50%
Principal amount	[1],[6],[8]	$ 20,000
Amortized Cost	[1],[6]	20,038
Investments, at fair value	[1],[2],[6]	$ 20,092
Investment, Identifier [Axis]: CPV Maryland, LLC, Power
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13]			4%		4%
Principal amount	[4],[17]			$ 14,286
Amortized Cost	[4]			14,146
Investments, at fair value	[3],[4]			$ 14,155
Investment, Identifier [Axis]: CPV Shore Holdings LLC, Power
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13]			3.75%		3.75%
Principal amount	[4],[17]			$ 23,601
Amortized Cost	[4]			22,760
Investments, at fair value	[3],[4]			21,935
Investment, Identifier [Axis]: Charlotte Buyer, Inc., Health Care Equipment & Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[7]	5.25%
Principal amount	[1],[6],[7],[8]	$ 19,845
Amortized Cost	[1],[6],[7]	19,937
Investments, at fair value	[1],[2],[6],[7]	$ 19,952
Investment, Identifier [Axis]: Cimarron Energy Holdco Inc., Common Equity, Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[20],[21],[22]			3,950
Investments, at fair value	[3],[4],[14],[20],[21],[22]			0
Investment, Identifier [Axis]: Cimarron Energy Holdco Inc., Participation Option, Service & Equipment
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[20],[21],[22]			1,289
Investments, at fair value	[3],[4],[14],[20],[21],[22]			$ 0
Investment, Identifier [Axis]: Cimarron Energy Inc., Service & Equipment
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14],[21],[22],[29]			9%		9%
Principal amount	[4],[14],[17],[21],[22],[29]			$ 7,500
Amortized Cost	[4],[14],[21],[22],[29]			6,563
Investments, at fair value	[3],[4],[14],[21],[22],[29]			$ 3,713
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[10]	6.75%
Principal amount	[1],[6],[8],[10]	$ 20,915
Amortized Cost	[1],[6],[10]	20,915
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services1
Schedule of Investments [Line Items]
Investments, at fair value	[1],[2],[6],[10]	$ 21,098
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services2
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[9],[10]	6.75%
Principal amount	[1],[8],[9],[10]	$ 2,688
Amortized Cost	[1],[9],[10]	2,688
Investments, at fair value	[1],[2],[9],[10]	$ 2,712
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Consumer Services3
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[9],[10]	6.75%
Principal amount	[1],[8],[9],[10]	$ 1,344
Amortized Cost	[1],[9],[10]	1,344
Investments, at fair value	[1],[2],[9],[10]	$ 1,356
Investment, Identifier [Axis]: Cirque Du Soleil Holding USA Newco, Inc., Financial Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[7]	4.25%
Principal amount	[1],[6],[7],[8]	$ 6,387
Amortized Cost	[1],[6],[7]	6,331
Investments, at fair value	[1],[2],[6],[7]	$ 6,372
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[10]	7.65%
Principal amount	[1],[6],[8],[10]	$ 35,000
Amortized Cost	[1],[6],[10]	34,527
Investments, at fair value	[1],[2],[6],[10]	$ 34,426
Investment, Identifier [Axis]: Citizen Energy Operating, LLC, Upstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14],[22]			7.65%		7.65%
Principal amount	[4],[14],[17],[22]			$ 39,000
Amortized Cost	[4],[14],[22]			38,440
Investments, at fair value	[3],[4],[14],[22]			$ 38,240
Investment, Identifier [Axis]: Clear Channel Outdoor Holdings, Inc., Media & Entertainment
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[12]	3.50%
Principal amount	[1],[6],[8],[12]	$ 20,000
Amortized Cost	[1],[6],[12]	19,551
Investments, at fair value	[1],[2],[6],[12]	$ 19,829
Investment, Identifier [Axis]: Clydesdale Acquisition Holdings Inc., Financials Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	4.18%
Principal amount	[1],[6],[8]	$ 19,949
Amortized Cost	[1],[6]	19,740
Investments, at fair value	[1],[2],[6]	20,061
Investment, Identifier [Axis]: Compass Power Generation LLC, Power
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13]			4.25%		4.25%
Principal amount	[4],[17]			$ 31,575
Amortized Cost	[4]			30,712
Investments, at fair value	[3],[4]			31,384
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[8],[10],[30],[31]	100,000
Amortized Cost	[1],[10],[30],[31]	1,129
Investments, at fair value	[1],[2],[10],[30],[31]	$ 1,234
Investment, Identifier [Axis]: Cox Oil Offshore, LLC, Volumetric Production Payments, Upstream
Schedule of Investments [Line Items]
Principal amount	[4],[14],[17],[32],[33]			100,000
Amortized Cost	[4],[14],[32],[33]			11,081
Investments, at fair value	[3],[4],[14],[32],[33]			$ 20,683
Investment, Identifier [Axis]: Crown SubSea Communications Holding, Inc., Capital Goods 1
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[7]	5%
Principal amount	[1],[6],[7],[8]	$ 4,500
Amortized Cost	[1],[6],[7]	4,523
Investments, at fair value	[1],[2],[6],[7]	$ 4,534
Investment, Identifier [Axis]: Crown SubSea Communications Holding, Inc., Capital Goods 2
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[7]	5.25%
Principal amount	[1],[6],[7],[8]	$ 5,430
Amortized Cost	[1],[6],[7]	5,445
Investments, at fair value	[1],[2],[6],[7]	$ 5,468
Investment, Identifier [Axis]: EIF Van Hook Holdings, LLC, Midstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13]			5.25%		5.25%
Principal amount	[4],[17]			$ 26,882
Amortized Cost	[4]			26,609
Investments, at fair value	[3],[4]			$ 26,075
Investment, Identifier [Axis]: ERA II Minerals, LLC, Upstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14],[22]			6.25%		6.25%
Principal amount	[4],[14],[17],[22]			$ 37,000
Amortized Cost	[4],[14],[22]			36,601
Investments, at fair value	[3],[4],[14],[22]			36,656
Investment, Identifier [Axis]: Earthstone Energy Holdings, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[4],[16],[17]			11,400
Amortized Cost	[4],[16]			11,400
Investments, at fair value	[3],[4],[16]			10,920
Investment, Identifier [Axis]: Endeavor Energy Resources, L.P., Upstream
Schedule of Investments [Line Items]
Principal amount	[4],[17],[22]			24,299
Amortized Cost	[4],[22]			25,388
Investments, at fair value	[3],[4],[22]			$ 23,306
Investment, Identifier [Axis]: Engineered Machinery Holdings, Inc., Capital Goods
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	3.50%
Principal amount	[1],[6],[8]	$ 19,924
Amortized Cost	[1],[6]	19,847
Investments, at fair value	[1],[2],[6]	$ 19,840
Investment, Identifier [Axis]: FR BR Holdings LLC, Midstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14],[22]			6.50%		6.50%
Principal amount	[4],[14],[17],[22]			$ 81,582
Amortized Cost	[4],[14],[22]			80,371
Investments, at fair value	[3],[4],[14],[22]			$ 81,361
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Energy—Midstream
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[10]	7.50%
Principal amount	[1],[6],[8],[10]	$ 17,047
Amortized Cost	[1],[6],[10]	16,855
Investments, at fair value	[1],[2],[6],[10]	$ 17,156
Investment, Identifier [Axis]: FR XIII PAA Holdings HoldCo, LLC, Midstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14]			7.50%		7.50%
Principal amount	[4],[14],[17]			$ 17,347
Amortized Cost	[4],[14]			17,103
Investments, at fair value	[3],[4],[14]			$ 17,406
Investment, Identifier [Axis]: First Brands Group, LLC, Automobiles & Components
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	5%
Principal amount	[1],[6],[8]	$ 19,905
Amortized Cost	[1],[6]	19,620
Investments, at fair value	[1],[2],[6]	19,781
Investment, Identifier [Axis]: Full House Resorts, Inc., Consumer Services
Schedule of Investments [Line Items]
Principal amount	[1],[6],[8]	20,742
Amortized Cost	[1],[6]	18,561
Investments, at fair value	[1],[2],[6]	19,517
Investment, Identifier [Axis]: GIP II Blue Holding LP, Midstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13]			4.50%		4.50%
Principal amount	[4],[17]			$ 5,918
Amortized Cost	[4]			5,842
Investments, at fair value	[3],[4]			5,877
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity
Schedule of Investments [Line Items]
Investments, at fair value		1,661		5,044				0
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity, Energy—Midstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[19],[25],[34]	6,681
Investments, at fair value	[1],[2],[10],[19],[25],[34]	1,661
Investment, Identifier [Axis]: GWP Midstream Holdco, LLC, Common Equity, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[20],[21],[22],[27],[35]			6,681
Investments, at fair value	[3],[4],[14],[20],[21],[22],[27],[35]			$ 5,044
Investment, Identifier [Axis]: GasLog Ltd., Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	[1],[8],[10]	13,951
Amortized Cost	[1],[10]	13,874
Investments, at fair value	[1],[2],[10]	13,510
Investment, Identifier [Axis]: GasLog Ltd., Midstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14],[16]			7.75%		7.75%
Principal amount	[4],[14],[16],[17]			$ 14,648
Amortized Cost	[4],[14],[16]			14,556
Investments, at fair value	[3],[4],[14],[16]			$ 14,010
Investment, Identifier [Axis]: Generation Bridge LLC, Power 1
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13]			5%		5%
Principal amount	[4],[17]			$ 7,432
Amortized Cost	[4]			7,305
Investments, at fair value	[3],[4]			$ 7,385
Investment, Identifier [Axis]: Generation Bridge LLC, Power 2
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13]			5%		5%
Principal amount	[4],[17]			$ 163
Amortized Cost	[4]			160
Investments, at fair value	[3],[4]			162
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Commercial & Professional Services 1
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[19],[23]	2,786
Investments, at fair value	[1],[2],[10],[19],[23]	0
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Commercial & Professional Services 2
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[19],[23],[28]	12,493
Investments, at fair value	[1],[2],[10],[19],[23],[28]	$ 10,357
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Professional Services 1
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[20],[21],[22]			2,786
Investments, at fair value	[3],[4],[14],[20],[21],[22]			0
Investment, Identifier [Axis]: Global Jet Capital Holdings, LP, Preferred Equity, Professional Services 2
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[20],[21],[22],[29]			12,493
Investments, at fair value	[3],[4],[14],[20],[21],[22],[29]			$ 9,377
Investment, Identifier [Axis]: Gold Rush Amusements, Inc., Consumer Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[10]	7.50%
Principal amount	[1],[6],[8],[10]	$ 30,673
Amortized Cost	[1],[6],[10]	30,079
Investments, at fair value	[1],[2],[6],[10]	$ 30,059
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Energy—Midstream
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[10]	7%
Principal amount	[1],[6],[8],[10]	$ 14,516
Amortized Cost	[1],[6],[10]	14,326
Investments, at fair value	[1],[2],[6],[10]	$ 14,379
Investment, Identifier [Axis]: Goodnight Water Solutions, LLC, Midstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14]			7.25%		7.25%
Principal amount	[4],[14],[17]			$ 14,963
Amortized Cost	[4],[14]			14,752
Investments, at fair value	[3],[4],[14]			14,819
Investment, Identifier [Axis]: Great Western Petroleum, LLC
Schedule of Investments [Line Items]
Investments, at fair value				0				58,055
Investment, Identifier [Axis]: Great Western Petroleum, LLC, Common Equity
Schedule of Investments [Line Items]
Investments, at fair value				0				40,731
Investment, Identifier [Axis]: Guardian US Holdco, LLC, Financial Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	4%
Principal amount	[1],[6],[8]	$ 19,925
Amortized Cost	[1],[6]	19,922
Investments, at fair value	[1],[2],[6]	20,008
Investment, Identifier [Axis]: Guitar Center, Inc., Consumer Discretionary Distribution & Retail
Schedule of Investments [Line Items]
Principal amount	[1],[6],[8]	20,000
Amortized Cost	[1],[6]	17,987
Investments, at fair value	[1],[2],[6]	17,473
Investment, Identifier [Axis]: Hamilton Intermediate Holdings, LLC, Power
Schedule of Investments [Line Items]
Principal amount	[4],[14],[17]			30,391
Amortized Cost	[4],[14]			31,075
Investments, at fair value	[3],[4],[14]			31,007
Investment, Identifier [Axis]: Hammerhead Resources Inc., Upstream
Schedule of Investments [Line Items]
Principal amount	[4],[14],[16],[17],[22]			35,118
Amortized Cost	[4],[14],[16],[22]			34,961
Investments, at fair value	[3],[4],[14],[16],[22]			35,118
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity
Schedule of Investments [Line Items]
Investments, at fair value		271		810				2,836
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[19],[34]	14,418
Investments, at fair value	[1],[2],[19],[34]	$ 271
Investment, Identifier [Axis]: Harvest Oil & Gas Corp., Common Equity, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[20],[21],[22],[35]			15,059
Investments, at fair value	[3],[4],[20],[21],[22],[35]			810
Investment, Identifier [Axis]: Knowlton Development Corporation Inc., Household & Personal Products
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	5%
Principal amount	[1],[6],[8]	$ 21,000
Amortized Cost	[1],[6]	20,370
Investments, at fair value	[1],[2],[6]	$ 20,858
Investment, Identifier [Axis]: LABL, Inc., Commerical & Professional Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	5%
Principal amount	[1],[6],[8]	$ 19,864
Amortized Cost	[1],[6]	19,335
Investments, at fair value	[1],[2],[6]	$ 19,106
Investment, Identifier [Axis]: Learning Care Group No. 2 Inc., Consumer Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	4.75%
Principal amount	[1],[6],[8]	$ 19,950
Amortized Cost	[1],[6]	20,070
Investments, at fair value	[1],[2],[6]	20,100
Investment, Identifier [Axis]: Limetree Bay Energy, LLC
Schedule of Investments [Line Items]
Investments, at fair value				0				3,166
Investment, Identifier [Axis]: Limetree Bay Energy, LLC, Class A Units
Schedule of Investments [Line Items]
Investments, at fair value		0		1,885				6,046
Investment, Identifier [Axis]: Limetree Bay Energy, LLC, Class A Units, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[20],[21],[22],[35]			21,458
Investments, at fair value	[3],[4],[14],[20],[21],[22],[35]			1,885
Investment, Identifier [Axis]: MB Precision Investment Holdings LLC, Class A-2 Units, Industrials
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[20],[21],[22],[27]			490
Investments, at fair value	[3],[4],[14],[20],[21],[22],[27]			0
Investment, Identifier [Axis]: MECO IV Holdco, LLC
Schedule of Investments [Line Items]
Investments, at fair value				0				22,745
Investment, Identifier [Axis]: MECO IV Holdco, LLC, Class A-1 Units
Schedule of Investments [Line Items]
Investments, at fair value				0				4,181
Investment, Identifier [Axis]: Maverick Natural Resources, LLC, Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[19],[25]	93,044
Investments, at fair value	[1],[2],[10],[19],[25]	$ 164,040
Investment, Identifier [Axis]: Maverick Natural Resources, LLC, Common Equity, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[20],[22],[27]			138,208
Investments, at fair value	[3],[4],[14],[20],[22],[27]			$ 312,372
Investment, Identifier [Axis]: Mavis Tire Express Services TopCo, L.P., Consumer Discretionary Distribution & Retail
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	4%
Principal amount	[1],[6],[8]	$ 19,893
Amortized Cost	[1],[6]	19,797
Investments, at fair value	[1],[2],[6]	19,955
Investment, Identifier [Axis]: Medallion Midland Acquisition LP, Midstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13]			3.75%		3.75%
Principal amount	[4],[17]			$ 7,920
Amortized Cost	[4]			7,886
Investments, at fair value	[3],[4]			7,862
Investment, Identifier [Axis]: Moss Creek Resources, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[4],[17],[22]			11,693
Amortized Cost	[4],[22]			10,358
Investments, at fair value	[3],[4],[22]			10,561
Investment, Identifier [Axis]: NGL Energy Partners, LP, Preferred Equity, Energy—Midstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[10],[12],[19],[23],[28]	157,633
Investments, at fair value	[1],[2],[6],[10],[12],[19],[23],[28]	141,141
Investment, Identifier [Axis]: NGL Energy Partners, LP, Preferred Equity, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[16],[20],[21],[22],[29]			157,633
Investments, at fair value	[3],[4],[14],[16],[20],[21],[22],[29]			125,000
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $13.56, Energy—Midstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[12],[19]	630
Investments, at fair value	[1],[2],[10],[12],[19]	621
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $13.56, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[16],[21],[22]			630
Investments, at fair value	[3],[4],[14],[16],[21],[22]			3
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $14.54, Energy—Midstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[12],[19]	3,083
Investments, at fair value	[1],[2],[10],[12],[19]	2,682
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Par), Strike: $14.54, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[16],[20],[21],[22]			3,083
Investments, at fair value	[3],[4],[14],[16],[20],[21],[22]			10
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $16.27, Energy—Midstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[12],[19]	576
Investments, at fair value	[1],[2],[10],[12],[19]	735
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $16.27, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[16],[20],[21],[22]			576
Investments, at fair value	[3],[4],[14],[16],[20],[21],[22]			2
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $17.45, Energy—Midstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[12],[19]	2,623
Investments, at fair value	[1],[2],[10],[12],[19]	3,083
Investment, Identifier [Axis]: NGL Energy Partners, LP, Warrants (Premium), Strike: $17.45, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[16],[20],[21],[22]			2,623
Investments, at fair value	[3],[4],[14],[16],[20],[21],[22]			8
Investment, Identifier [Axis]: NRG Energy, Inc., Power
Schedule of Investments [Line Items]
Principal amount	[4],[16],[17]			19,125
Amortized Cost	[4],[16]			18,668
Investments, at fair value	[3],[4],[16]			14,401
Investment, Identifier [Axis]: Navios Logistics Finance, Inc., Transportation
Schedule of Investments [Line Items]
Principal amount	[1],[6],[8],[12]	20,000
Amortized Cost	[1],[6],[12]	19,680
Investments, at fair value	[1],[2],[6],[12]	$ 19,772
Investment, Identifier [Axis]: Nephron Pharmaceuticals Corp., Pharmaceuticals, Biotechnology & Life Sciences
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[10]	9%
Principal amount	[1],[8],[10]	$ 20,000
Amortized Cost	[1],[10]	19,400
Investments, at fair value	[1],[2],[10]	19,300
Investment, Identifier [Axis]: NuStar, Preferred Equity, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[16],[20],[22]			73,114
Investments, at fair value	[3],[4],[14],[16],[20],[22]			$ 83,590
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 1
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14]			5.25%		5.25%
Principal amount	[4],[14],[17]			$ 18,659
Amortized Cost	[4],[14]			18,579
Investments, at fair value	[3],[4],[14]			$ 18,847
Investment, Identifier [Axis]: OE2 North, LLC, Midstream 2
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14],[18]			5.25%		5.25%
Principal amount	[4],[14],[17],[18]			$ 11,341
Amortized Cost	[4],[14],[18]			11,341
Investments, at fair value	[3],[4],[14],[18]			$ 11,455
Investment, Identifier [Axis]: Oryx Midstream Services Permian Basin LLC, Midstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[22]			3.25%		3.25%
Principal amount	[4],[17],[22]			$ 32,357
Amortized Cost	[4],[22]			32,220
Investments, at fair value	[3],[4],[22]			$ 32,026
Investment, Identifier [Axis]: Parkway Generation LLC, Power 1
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13]			4.75%		4.75%
Principal amount	[4],[17]			$ 5,760
Amortized Cost	[4]			5,708
Investments, at fair value	[3],[4]			$ 5,700
Investment, Identifier [Axis]: Parkway Generation LLC, Power 2
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13]			4.75%		4.75%
Principal amount	[4],[17]			$ 43,910
Amortized Cost	[4]			43,513
Investments, at fair value	[3],[4]			$ 43,285
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 1
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14],[22]			6.75%		6.75%
Principal amount	[4],[14],[17],[22]			$ 13,545
Amortized Cost	[4],[14],[22]			13,528
Investments, at fair value	[3],[4],[14],[22]			$ 13,394
Investment, Identifier [Axis]: Peak Exploration & Production, LLC, Upstream 2
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14],[18]			6.75%		6.75%
Principal amount	[4],[14],[17],[18]			$ 1,505
Amortized Cost	[4],[14],[18]			1,505
Investments, at fair value	[3],[4],[14],[18]			1,488
Investment, Identifier [Axis]: Permian Production Holdings, LLC
Schedule of Investments [Line Items]
Investments, at fair value		4,816		4,767				7,889
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity
Schedule of Investments [Line Items]
Investments, at fair value		748		11,420				8,829
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[19],[25],[34]	5
Investments, at fair value	[1],[2],[10],[19],[25],[34]	748
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Common Equity, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[22],[27],[35]			5
Investments, at fair value	[3],[4],[14],[22],[27],[35]			11,420
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Principal amount	[1],[8],[10],[34]	4,864
Amortized Cost	[1],[10],[34]	4,497
Investments, at fair value	[1],[2],[10],[34]	$ 4,816
Investment, Identifier [Axis]: Permian Production Holdings, LLC, Upstream
Schedule of Investments [Line Items]
Principal amount	[4],[14],[17],[22],[35]			4,767
Amortized Cost	[4],[14],[22],[35]			4,266
Investments, at fair value	[3],[4],[14],[22],[35]			4,767
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 1
Schedule of Investments [Line Items]
Principal amount	[4],[17]			26,365
Amortized Cost	[4]			27,511
Investments, at fair value	[3],[4]			25,703
Investment, Identifier [Axis]: Permian Resources Operating LLC, Upstream 2
Schedule of Investments [Line Items]
Principal amount	[4],[17],[22]			5,200
Amortized Cost	[4],[22]			5,257
Investments, at fair value	[3],[4],[22]			$ 4,473
Investment, Identifier [Axis]: Phoenix Guarantor Inc., Financial Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[7]	3.50%
Principal amount	[1],[6],[7],[8]	$ 19,923
Amortized Cost	[1],[6],[7]	19,891
Investments, at fair value	[1],[2],[6],[7]	19,951
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 1
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14]			6.75%		6.75%
Principal amount	[4],[14],[17]			$ 9,370
Amortized Cost	[4],[14]			9,304
Investments, at fair value	[3],[4],[14]			$ 9,310
Investment, Identifier [Axis]: Pinnacle Midland Gas Holdco LLC, Midstream 2
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14],[18]			6.75%		6.75%
Principal amount	[4],[14],[17],[18]			$ 2,477
Amortized Cost	[4],[14],[18]			2,477
Investments, at fair value	[3],[4],[14],[18]			2,461
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 1
Schedule of Investments [Line Items]
Principal amount	[1],[8],[10],[19],[28]	13,297
Amortized Cost	[1],[10],[19],[28]	12,329
Investments, at fair value	[1],[2],[10],[19],[28]	7,473
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Energy—Power 2
Schedule of Investments [Line Items]
Principal amount	[1],[8],[10],[19],[28]	4,015
Amortized Cost	[1],[10],[19],[28]	3,827
Investments, at fair value	[1],[2],[10],[19],[28]	0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Energy—Power
Schedule of Investments [Line Items]
Principal amount	[1],[8],[9],[10]	2,709
Amortized Cost	[1],[9],[10]	2,709
Investments, at fair value	[1],[2],[9],[10]	$ 0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Letter of Credit, Power
Schedule of Investments [Line Items]
Principal amount	[4],[14],[17],[18]			2,709
Amortized Cost	[4],[14],[18]			2,709
Investments, at fair value	[3],[4],[14],[18]			0
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 1
Schedule of Investments [Line Items]
Principal amount	[4],[14],[17],[22]			12,121
Amortized Cost	[4],[14],[22]			12,121
Investments, at fair value	[3],[4],[14],[22]			9,997
Investment, Identifier [Axis]: Plainfield Renewable Energy Holdings LLC, Power 2
Schedule of Investments [Line Items]
Principal amount	[4],[14],[17],[22]			3,643
Amortized Cost	[4],[14],[22]			3,643
Investments, at fair value	[3],[4],[14],[22]			$ 0
Investment, Identifier [Axis]: Potomac Energy Center, LLC, Power
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14]			6%		6%
Principal amount	[4],[14],[17]			$ 58,459
Amortized Cost	[4],[14]			57,508
Investments, at fair value	[3],[4],[14]			58,443
Investment, Identifier [Axis]: Pretium PKG Holdings, Inc., Materials
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	5%
Principal amount	[1],[6],[8]	$ 30,118
Amortized Cost	[1],[6]	29,634
Investments, at fair value	[1],[2],[6]	$ 29,591
Investment, Identifier [Axis]: Pro Mach Group, Inc., Capital Goods
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	4%
Principal amount	[1],[6],[8]	$ 19,924
Amortized Cost	[1],[6]	19,979
Investments, at fair value	[1],[2],[6]	$ 20,007
Investment, Identifier [Axis]: Proampac PG Borrower LLC, Materials
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	4.50%
Principal amount	[1],[6],[8]	$ 20,000
Amortized Cost	[1],[6]	19,994
Investments, at fair value	[1],[2],[6]	$ 20,062
Investment, Identifier [Axis]: Ranger Oil Corp., Upstream
Schedule of Investments [Line Items]
Principal amount	[4],[16],[17]			29,772
Amortized Cost	[4],[16]			29,633
Investments, at fair value	[3],[4],[16]			29,678
Investment, Identifier [Axis]: Realtruck Group, Inc., Automobiles & Components
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[7]	3.50%
Principal amount	[1],[6],[7],[8]	$ 19,956
Amortized Cost	[1],[6],[7]	19,117
Investments, at fair value	[1],[2],[6],[7]	19,740
Investment, Identifier [Axis]: Ridgeback Resources Inc., Common Equity
Schedule of Investments [Line Items]
Investments, at fair value		$ 0		41,851				48,356
Investment, Identifier [Axis]: Ridgeback Resources Inc., Common Equity, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[16],[22],[35],[36]			46,599
Investments, at fair value	[3],[4],[14],[16],[22],[35],[36]			41,851
Investment, Identifier [Axis]: Ryan, LLC, Commerical & Professional Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[7]	4.50%
Principal amount	[1],[6],[7],[8]	$ 9,844
Amortized Cost	[1],[6],[7]	9,868
Investments, at fair value	[1],[2],[6],[7]	9,890
Investment, Identifier [Axis]: Ryan, LLC, Commerical & Professional Services1
Schedule of Investments [Line Items]
Principal amount	[1],[7],[8],[9]	1,036
Amortized Cost	[1],[7],[9]	1,039
Investments, at fair value	[1],[2],[7],[9]	$ 1,041
Investment, Identifier [Axis]: Ryan, LLC, Commerical & Professional Services2
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[7],[9]	4.50%
Investment, Identifier [Axis]: SRS Distribution Inc., Capital Goods
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[7]	3.50%
Principal amount	[1],[6],[7],[8]	$ 19,924
Amortized Cost	[1],[6],[7]	19,729
Investments, at fair value	[1],[2],[6],[7]	19,982
Investment, Identifier [Axis]: ST EIP Holdings Inc., Energy—Midstream
Schedule of Investments [Line Items]
Principal amount	[1],[6],[8],[10]	10,365
Amortized Cost	[1],[6],[10]	9,951
Investments, at fair value	[1],[2],[6],[10]	9,874
Investment, Identifier [Axis]: ST EIP Holdings Inc., Midstream
Schedule of Investments [Line Items]
Principal amount	[4],[14],[17]			10,526
Amortized Cost	[4],[14]			10,064
Investments, at fair value	[3],[4],[14]			10,074
Investment, Identifier [Axis]: Segreto Power Holdings, LLC, Preferred Equity, Power
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[20],[21],[22],[27],[29]			99,766
Investments, at fair value	[3],[4],[14],[20],[21],[22],[27],[29]			$ 83,647
Investment, Identifier [Axis]: SilverBow Resources, Inc., Upstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14],[16],[22]			7.50%		7.50%
Principal amount	[4],[14],[16],[17],[22]			$ 14,250
Amortized Cost	[4],[14],[16],[22]			14,199
Investments, at fair value	[3],[4],[14],[16],[22]			$ 14,322
Investment, Identifier [Axis]: Sitio Royalties Operating Partnership, LP, Upstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14],[16],[22]			6.50%		6.50%
Principal amount	[4],[14],[16],[17],[22]			$ 19,500
Amortized Cost	[4],[14],[16],[22]			19,318
Investments, at fair value	[3],[4],[14],[16],[22]			19,256
Investment, Identifier [Axis]: Suburban Propane Partners LP, Midstream
Schedule of Investments [Line Items]
Principal amount	[4],[16],[17],[22]			7,590
Amortized Cost	[4],[16],[22]			7,837
Investments, at fair value	[3],[4],[16],[22]			6,461
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Investments, at fair value		39,427		51,098				50,770
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Energy—Power
Schedule of Investments [Line Items]
Principal amount	[1],[8],[10],[12],[26]	60,603
Amortized Cost	[1],[10],[12],[26]	43,150
Investments, at fair value	[1],[2],[10],[12],[26]	$ 39,427
Investment, Identifier [Axis]: Sustainable Infrastructure Investments, LLC, Power
Schedule of Investments [Line Items]
Principal amount	[4],[14],[16],[17],[24]			60,603
Amortized Cost	[4],[14],[16],[24]			54,514
Investments, at fair value	[3],[4],[14],[16],[24]			51,098
Investment, Identifier [Axis]: Swift Worldwide Resources Holdco Limited, Common Equity, Commercial & Professional Services
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[16],[21],[22],[37]			6,029
Investments, at fair value	[3],[4],[14],[16],[21],[22],[37]			3,131
Investment, Identifier [Axis]: TKC Holdings, Inc., Consumer Staples Distribution & Retail
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	5.50%
Principal amount	[1],[6],[8]	$ 19,650
Amortized Cost	[1],[6]	18,681
Investments, at fair value	[1],[2],[6]	18,830
Investment, Identifier [Axis]: Tallgrass Energy Partners, LP, Midstream
Schedule of Investments [Line Items]
Principal amount	[4],[17],[22]			19,761
Amortized Cost	[4],[22]			19,676
Investments, at fair value	[3],[4],[22]			18,480
Investment, Identifier [Axis]: Telpico, LLC, Common Equity
Schedule of Investments [Line Items]
Investments, at fair value		0		0				0
Investment, Identifier [Axis]: Telpico, LLC, Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[19],[25],[34]	0
Investments, at fair value	[1],[2],[10],[19],[25],[34]	0
Investment, Identifier [Axis]: Telpico, LLC, Common Equity, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[21],[22],[27],[35]			0
Investments, at fair value	[3],[4],[14],[21],[22],[27],[35]			0
Investment, Identifier [Axis]: Tenrgys, LLC, Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[19],[25]	7,571
Investments, at fair value	[1],[2],[10],[19],[25]	$ 4,418
Investment, Identifier [Axis]: Tenrgys, LLC, Common Equity, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[21],[22],[27]			7,571
Investments, at fair value	[3],[4],[14],[21],[22],[27]			$ 6,801
Investment, Identifier [Axis]: Tenrgys, LLC, Energy—Upstream
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[10]	7.50%
Principal amount	[1],[6],[8],[10]	$ 20,537
Amortized Cost	[1],[6],[10]	20,537
Investments, at fair value	[1],[2],[6],[10]	$ 19,998
Investment, Identifier [Axis]: Tenrgys, LLC, Upstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14],[22]			7.50%		7.50%
Principal amount	[4],[14],[17],[22]			$ 20,537
Amortized Cost	[4],[14],[22]			20,537
Investments, at fair value	[3],[4],[14],[22]			$ 20,537
Investment, Identifier [Axis]: Traverse Midstream Partners LLC, Midstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13]			4.25%		4.25%
Principal amount	[4],[17]			$ 28,436
Amortized Cost	[4]			28,484
Investments, at fair value	[3],[4]			28,418
Investment, Identifier [Axis]: TruGreen, LP, Commercial & Professional Services
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6]	4%
Principal amount	[1],[6],[8]	$ 19,910
Amortized Cost	[1],[6]	18,614
Investments, at fair value	[1],[2],[6]	19,268
Investment, Identifier [Axis]: U.S. Treasury Bill
Schedule of Investments [Line Items]
Principal amount	[1],[38]	21,000
Amortized Cost	[1],[38]	20,994
Investments, at fair value	[1],[2],[38]	21,000
Investment, Identifier [Axis]: USA Compression Partners, LP, Common Equity, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[16],[21],[22]			1,617
Investments, at fair value	[3],[4],[16],[21],[22]			1,655
Investment, Identifier [Axis]: USA Compression Partners, LP, Preferred Equity, Energy—Midstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[6],[10],[12],[23]	78,091
Investments, at fair value	[1],[2],[6],[10],[12],[23]	98,333
Investment, Identifier [Axis]: USA Compression Partners, LP, Preferred Equity, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[16],[20]			77,943
Investments, at fair value	[3],[4],[14],[16],[20]			90,479
Investment, Identifier [Axis]: USA Compression Partners, LP, Warrants (Premium), Strike: $19.59, Midstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[16],[21],[22]			714
Investments, at fair value	[3],[4],[14],[16],[21],[22]			5,711
Investment, Identifier [Axis]: Warren Resources, Inc.
Schedule of Investments [Line Items]
Investments, at fair value		23,823		23,584				23,688
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity
Schedule of Investments [Line Items]
Investments, at fair value		15,566		36,982				$ 25,854
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity, Energy—Upstream
Schedule of Investments [Line Items]
Amortized Cost	[1],[10],[19],[26]	20,754
Investments, at fair value	[1],[2],[10],[19],[26]	$ 15,566
Investment, Identifier [Axis]: Warren Resources, Inc., Common Equity, Upstream
Schedule of Investments [Line Items]
Amortized Cost	[4],[14],[21],[22],[24]			20,754
Investments, at fair value	[3],[4],[14],[21],[22],[24]			$ 36,982
Investment, Identifier [Axis]: Warren Resources, Inc., Energy—Upstream
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[10],[26]	9%
Principal amount	[1],[6],[8],[10],[26]	$ 23,823
Amortized Cost	[1],[6],[10],[26]	23,823
Investments, at fair value	[1],[2],[6],[10],[26]	$ 23,823
Investment, Identifier [Axis]: Warren Resources, Inc., Upstream
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14],[24]			9%		9%
Principal amount	[4],[14],[17],[24]			$ 23,584
Amortized Cost	[4],[14],[24]			23,584
Investments, at fair value	[3],[4],[14],[24]			$ 23,584
Investment, Identifier [Axis]: Wattbridge Inc., Energy—Power
Schedule of Investments [Line Items]
Variable rate (percent)	[1],[5],[6],[10]	9.85%
Principal amount	[1],[6],[8],[10]	$ 42,938
Amortized Cost	[1],[6],[10]	42,938
Investments, at fair value	[1],[2],[6],[10]	41,882
Investment, Identifier [Axis]: Wattbridge Inc., Power
Schedule of Investments [Line Items]
Variable rate (percent)	[4],[13],[14]			7.85%		7.85%
Principal amount	[4],[14],[17]			$ 42,500
Amortized Cost	[4],[14]			42,500
Investments, at fair value	[3],[4],[14]			41,880
Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Amortized Cost		170,083		274,088
Investments, at fair value		$ 170,949		$ 275,058
Percent of net assets (percent)		100%		100%		100%
Sustainable Infrastructure Investments, LLC \| Senior Secured Loans—First Lien
Schedule of Investments [Line Items]
Amortized Cost		$ 170,083		$ 274,088
Investments, at fair value		$ 170,949		$ 275,058
Percent of net assets (percent)		100%		100%		100%
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Alianca Transportadora de Gas Participacoes S.A., Midstream
Schedule of Investments [Line Items]
Variable rate (percent)				2.60%		2.60%
Principal amount				$ 73,707
Amortized Cost				73,707
Investments, at fair value				$ 74,601
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Blue Heron Intermediate Holdco I, LLC, Midstream
Schedule of Investments [Line Items]
Variable rate (percent)		1.88%		1.88%		1.88%
Principal amount		$ 30,661		$ 31,832
Amortized Cost		30,661		31,832
Investments, at fair value		$ 30,692		$ 31,885
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Cedar Creek II LLC, Renewables
Schedule of Investments [Line Items]
Variable rate (percent)				1.88%		1.88%
Principal amount				$ 8,710
Amortized Cost				8,710
Investments, at fair value				$ 8,722
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Copper Mountain Solar 3, LLC, Renewables
Schedule of Investments [Line Items]
Variable rate (percent)		1.88%		1.75%		1.75%
Principal amount		$ 16,104		$ 17,804
Amortized Cost		16,104		17,804
Investments, at fair value		$ 16,172		$ 17,879
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: FLNG Liquefaction 2, LLC, Midstream
Schedule of Investments [Line Items]
Variable rate (percent)		1.50%		1.50%		1.50%
Principal amount		$ 26,567		$ 28,170
Amortized Cost		26,567		28,170
Investments, at fair value		26,557		27,990
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Largest Portfolio Company Investment
Schedule of Investments [Line Items]
Amortized Cost		$ 57,227		$ 73,707
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Meikle Wind Energy, LP, Renewables
Schedule of Investments [Line Items]
Variable rate (percent)				1.50%		1.50%
Principal amount						$ 16,030
Amortized Cost				$ 12,332
Investments, at fair value				$ 11,873
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: NES Hercules Class B Member, LLC, Renewables
Schedule of Investments [Line Items]
Variable rate (percent)		1.63%		1.50%		1.50%
Principal amount		$ 24,176		$ 24,487
Amortized Cost		24,176		24,487
Investments, at fair value		$ 24,769		$ 24,954
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: ST EIP Holdco LLC, Midstream
Schedule of Investments [Line Items]
Variable rate (percent)		2.50%		2.50%		2.50%
Principal amount		$ 57,227		$ 58,673
Amortized Cost		57,227		58,673
Investments, at fair value		$ 57,143		$ 58,288
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Seine Funding, LLC
Schedule of Investments [Line Items]
Variable rate (percent)									1.20%
Principal amount									$ 634,103
Sustainable Infrastructure Investments, LLC \| Investment, Identifier [Axis]: Top of the World Wind Energy LLC, Renewables
Schedule of Investments [Line Items]
Variable rate (percent)		2.13%		1.88%		1.88%
Principal amount		$ 15,348		$ 18,373
Amortized Cost		15,348		18,373
Investments, at fair value		$ 15,616		$ 18,866

[1]Security may be an obligation of one or more entities affiliated with the named company.[2]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.[3]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.[4]Security may be an obligation of one or more entities affiliated with the named company.[5]Certain variable rate securities in the Company’s portfolio bear interest at a rate determined by a publicly disclosed base rate plus a basis point spread. As of December 31, 2023, the one-month and three-month Secured Overnight Financing Rate, or SOFR, or S, was 5.35% and 5.33%, respectively, and the Overnight Bank Funding Rate, or OBFR, was 5.32%. SOFR based contracts may include a credit spread adjustment that is charged in addition to the base rate and basis point spread. PIK means paid-in-kind. PIK income accruals may be adjusted based on the fair value of the underlying investment. Variable rate securities with no floor rate use the respective benchmark rate in all cases. Portfolio Company Fair Value at December 31, 2021 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income (3) PIK Income (3) Dividend Income (3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC (4) $ 7,782 $ 654 $ — $ — $ — $ 8,436 $ — $ 654 $ — Allied Wireline Services, LLC 46,339 5,808 — — 11,741 63,888 316 5,808 — MECO IV Holdco, LLC 22,745 455 (23,200) — — — — 455 — Warren Resources, Inc. 23,688 237 (341) — — 23,584 2,620 237 — Sustainable Infrastructure Investments, LLC Sustainable Infrastructure Investments, LLC 50,770 — — — 328 51,098 — — 735 Equity/Other Allied Wireline Services, LLC, Common Equity — — — — 10,463 10,463 — — — Allied Wireline Services, LLC, Warrants — — — — — — — — — MECO IV Holdco, LLC, Class A-1 Units 4,181 — (18,060) 15,899 (2,020) — — — — Warren Resources, Inc., Common Equity 25,854 — — — 11,128 36,982 — — — $ 181,359 $ 7,154 $ (41,601) $ 15,899 $ 31,640 $ 194,451 $ 2,936 $ 7,154 $ 735 _____________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest, PIK and dividend income presented for the year ended December 31, 2022. (4) Security includes a partially unfunded commitment with amortized cost of $2,500 and fair value of $2,500. Portfolio Company Fair Value at December 31, 2022 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2023 Interest Income (3) PIK Income (3) Dividend Income (3) Senior Secured Loans—First Lien Allied Downhole Technologies, LLC $ 8,436 $ 138 $ (8,574) $ — $ — $ — $ 256 $ 139 $ — Allied Wireline Services, LLC 63,888 6,389 — — (48,077) 22,200 — 2,910 — Warren Resources, Inc. 23,584 239 — — — 23,823 3,464 179 — Sustainable Infrastructure Investments, LLC Sustainable Infrastructure Investments, LLC 51,098 — (11,364) — (307) 39,427 — — 8,324 Equity/Other Allied Wireline Services, LLC, Common Equity 10,463 — — — (10,463) — — — — Allied Wireline Services, LLC, Warrants — — — — — — — — — Warren Resources, Inc., Common Equity 36,982 — — — (21,416) 15,566 — — — $ 194,451 $ 6,766 $ (19,938) $ — $ (80,263) $ 101,016 $ 3,720 $ 3,228 $ 8,324 _____________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest, PIK and dividend income presented for the year ended December 31, 2023. Portfolio Company Fair Value at December 31, 2022 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2023 Interest Income (3) PIK Income (3) Senior Secured Loans—First Lien Permian Production Holdings, LLC $ 4,767 $ 231 $ — $ — $ (182) $ 4,816 $ 675 $ 97 Equity/Other GWP Midstream Holdco, LLC, Common Equity 5,044 — (3,112) 3,112 (3,383) 1,661 — — Harvest Oil & Gas Corp., Common Equity 810 — (641) — 102 271 — — Limetree Bay Energy, LLC, Class A Units 1,885 246 — (21,704) 19,573 — — — Permian Production Holdings, LLC, Common Equity 11,420 — — — (10,672) 748 — — Ridgeback Resources Inc., Common Equity 41,851 — (35,240) (11,359) 4,748 — — — Telpico, LLC, Common Equity — — — — — — — — $ 65,777 $ 477 $ (38,993) $ (29,951) $ 10,186 $ 7,496 $ 675 $ 97 _____________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest and PIK income presented for the year ended December 31, 2023. Portfolio Company Fair Value at December 31, 2021 Gross Additions (1) Gross Reductions (2) Net Realized Gain (Loss) Net Change in Unrealized Appreciation (Depreciation) Fair Value at December 31, 2022 Interest Income (3) PIK Income (3) Fee Income (3) Dividend Income (3) Senior Secured Loans—First Lien Limetree Bay Energy, LLC $ 3,166 $ — $ (1,587) $ (12,756) $ 11,177 $ — $ — $ — $ — $ — Permian Production Holdings, LLC 7,889 697 (3,674) 551 (696) 4,767 570 105 — — Senior Secured Bonds Great Western Petroleum, LLC 58,055 96 (55,096) 1,087 (4,142) — 2,649 — 7,268 — Equity/Other Great Western Petroleum, LLC, Common Equity 40,731 — (84,871) 54,081 (9,941) — — — — — GWP Midstream Holdco, LLC, Common Equity — 6,681 — — (1,637) 5,044 — — — — Harvest Oil & Gas Corp., Common Equity 2,836 — (743) — (1,283) 810 — — — — Limetree Bay Energy, LLC, Class A Units 6,046 1,795 — — (5,956) 1,885 — — — — Permian Production Holdings, LLC, Common Equity 8,829 4 — — 2,587 11,420 — — — 1,726 Ridgeback Resources Inc., Common Equity 48,356 — (12,559) 173 5,881 41,851 — — — 3,691 Telpico, LLC, Common Equity — — — — — — — — — — $ 175,908 $ 9,273 $ (158,530) $ 43,136 $ (4,010) $ 65,777 $ 3,219 $ 105 $ 7,268 $ 5,417 _______________ (1) Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK interest, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company into this category from a different category. (2) Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and/or the movement of an existing portfolio company out of this category into a different category. (3) Interest, PIK, fee and dividend income presented for the year ended December 31, 2022.

Investment Portfolio - Schedu_5

Investment Portfolio - Schedule of Balance Sheet Information for SIIJV (Details) - USD ($) $ in Thousands	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Investments, at fair value	$ 1,523,196	[1],[2]	$ 2,047,115	[3]
Cash and cash equivalents	486,059	[1],[2],[4]	481,655
Total assets	2,059,557		2,558,781
Total liabilities	497,502		805,033
Members' equity	1,562,055		1,753,748		$ 1,602,323	$ 1,428,577	$ 2,379,605
Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Investments, at fair value	170,949		275,058
Cash and cash equivalents	29,089		10,380
Total assets	200,038		285,438
Debt	145,483		213,583
Other liabilities	3,406		3,358
Total liabilities	148,889		216,941
Members' equity	$ 51,149		$ 68,497

[1]Security may be an obligation of one or more entities affiliated with the named company.[2]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.[3]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.[4]Includes $23,098 held in Allspring Government Money Market Fund with a 7-day yield of 5.3% as of December 31, 2023.

Investment Portfolio - Schedu_6

Investment Portfolio - Schedule of Operations Information for SIIJV (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Total investment income		$ 42,708	$ 30,443	$ 41,476	$ 43,095	$ 59,535	$ 42,450	$ 47,073	$ 35,909	$ 157,722	$ 184,967	$ 150,707
Interest expense	[1]									23,698	55,716	54,122
Administrative services										6,087	5,626	5,713
Custodian and accounting fees										3,206	2,985	2,918
Professional services										588	731	692
Net expenses										73,776	112,845	107,448
Net investment income before taxes										83,946	72,122	43,259
Net realized and unrealized gain (loss)		$ (62,142)	$ (44,141)	$ (46,552)	$ (49,711)	$ 2,849	$ (64,453)	$ (5,256)	$ 181,593	(202,546)	114,733	$ 162,616
Sustainable Infrastructure Investments, LLC
Schedule of Investments [Line Items]
Total investment income										18,760	11,463
Interest expense										12,438	6,994
Administrative services										173	166
Custodian and accounting fees										183	184
Professional services										203	125
Other										49	54
Net expenses										13,046	7,523
Net investment income before taxes										5,714	3,940
Net realized and unrealized gain (loss)										(562)	(821)
Net increase in net assets resulting from operations										$ 5,152	$ 3,119

[1] See Note 9 for a discussion of the Company’s financing arrangements.

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2023		Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value	$ 1,523,196	[1],[2]	$ 2,047,115	[3]
Level 1—Price quotations in active markets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value	0		2,465
Level 2—Significant other observable inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value	683,716		450,445
Level 3—Significant unobservable inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, at fair value	$ 839,480		$ 1,594,205

[1]Security may be an obligation of one or more entities affiliated with the named company.[2]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.[3]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - Assets and Liabilities Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 0	$ 0
Liabilities	0	698
Level 1—Price quotations in active markets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Liabilities	0	0
Level 2—Significant other observable inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Liabilities	0	698
Level 3—Significant unobservable inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Liabilities	$ 0	$ 0

Fair Value of Financial Instr_5

Fair Value of Financial Instruments - Reconciliation Fair Value, Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Accretion of discount (amortization of premium)	$ 6,023	$ 6,785	$ 11,170
Total
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	1,594,205	1,621,482
Accretion of discount (amortization of premium)	4,363	6,449
Purchases	97,258	258,156
Paid-in-kind interest	14,199	19,925
Sales and repayments	(658,499)	(523,740)
Transfers into Level 3	0	58,705
Transfers out of Level 3	0	0
Fair value at end of period	839,480	1,594,205	1,621,482
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	(194,898)	85,964
Total \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(48,054)	38,701
Total \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(163,992)	114,527
Senior Secured Loans— First Lien
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	443,245	414,075
Accretion of discount (amortization of premium)	2,227	1,781
Purchases	95,512	112,154
Paid-in-kind interest	9,858	11,284
Sales and repayments	(243,026)	(168,461)
Transfers into Level 3	0	58,705
Transfers out of Level 3	0	0
Fair value at end of period	237,307	443,245	414,075
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	(62,195)	15,525
Senior Secured Loans— First Lien \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(8,935)	(12,186)
Senior Secured Loans— First Lien \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(61,574)	25,893
Senior Secured Loans— Second Lien
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	143,270	84,083
Accretion of discount (amortization of premium)	757	275
Purchases	0	110,150
Paid-in-kind interest	0	537
Sales and repayments	(88,795)	(51,143)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	54,424	143,270	84,083
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	(440)	(421)
Senior Secured Loans— Second Lien \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(52)	12
Senior Secured Loans— Second Lien \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(756)	(644)
Senior Secured Bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	10,074	10,371
Accretion of discount (amortization of premium)	42	48
Purchases	0	0
Paid-in-kind interest	0	0
Sales and repayments	(161)	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	9,874	10,074	10,371
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	(87)	(345)
Senior Secured Bonds \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	6	0
Senior Secured Bonds \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(87)	(345)
Unsecured Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	54,374	104,659
Accretion of discount (amortization of premium)	107	151
Purchases	0	19,800
Paid-in-kind interest	4,341	7,916
Sales and repayments	(58,959)	(84,915)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	0	54,374	104,659
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	0	(382)
Unsecured Debt \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	232	(27,542)
Unsecured Debt \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(95)	34,305
Preferred Equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	400,414	497,288
Accretion of discount (amortization of premium)	1,230	4,194
Purchases	0	0
Paid-in-kind interest	0	188
Sales and repayments	(162,115)	(102,114)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	259,990	400,414	497,288
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	26,665	(3,691)
Preferred Equity \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(11,847)	7,203
Preferred Equity \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	32,308	(6,345)
Sustainable Infrastructure Investments, LLC
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	51,098	50,770
Accretion of discount (amortization of premium)	0	0
Purchases	0	0
Paid-in-kind interest	0	0
Sales and repayments	(11,364)	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	39,427	51,098	50,770
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	(307)	328
Sustainable Infrastructure Investments, LLC \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	0	0
Sustainable Infrastructure Investments, LLC \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(307)	328
Equity/Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	491,730	460,236
Accretion of discount (amortization of premium)	0	0
Purchases	1,746	16,052
Paid-in-kind interest	0	0
Sales and repayments	(94,079)	(117,107)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	238,458	491,730	$ 460,236
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	(158,534)	74,950
Equity/Other \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(27,458)	71,214
Equity/Other \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	$ (133,481)	$ 61,335

Fair Value of Financial Instr_6

Fair Value of Financial Instruments - Schedule of Valuation Techniques and Significant Unobservable Inputs Used in Recurring Level 3 Fair Value (Details) $ in Thousands	Dec. 31, 2023 USD ($) Bcfe MMcfe / d		Dec. 31, 2022 USD ($) Bcfe MMcfe / d MMBoe MMBoe / d
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 1,523,196	[1],[2]	$ 2,047,115	[3]
Level 3—Significant unobservable inputs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	839,480		1,594,205
Level 3—Significant unobservable inputs \| Senior Secured Loans—First Lien \| Market Comparables
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 212,250		$ 413,268
Level 3—Significant unobservable inputs \| Senior Secured Loans—First Lien \| Market Comparables \| Minimum \| Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.082		0.085
Level 3—Significant unobservable inputs \| Senior Secured Loans—First Lien \| Market Comparables \| Minimum \| EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	3.9		5
Level 3—Significant unobservable inputs \| Senior Secured Loans—First Lien \| Market Comparables \| Maximum \| Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.205		0.218
Level 3—Significant unobservable inputs \| Senior Secured Loans—First Lien \| Market Comparables \| Maximum \| EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	4.6		7.5
Level 3—Significant unobservable inputs \| Senior Secured Loans—First Lien \| Market Comparables \| Weighted Average \| Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.136		0.123
Level 3—Significant unobservable inputs \| Senior Secured Loans—First Lien \| Market Comparables \| Weighted Average \| EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	4.4		6.3
Level 3—Significant unobservable inputs \| Senior Secured Loans—First Lien \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 4,807		$ 29,977
Level 3—Significant unobservable inputs \| Senior Secured Loans—First Lien \| Discounted Cash Flow \| Minimum \| Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	9		0.115
Level 3—Significant unobservable inputs \| Senior Secured Loans—First Lien \| Discounted Cash Flow \| Maximum \| Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	13		0.195
Level 3—Significant unobservable inputs \| Senior Secured Loans—First Lien \| Discounted Cash Flow \| Weighted Average \| Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.108		0.154
Level 3—Significant unobservable inputs \| Senior Secured Loans—First Lien \| Other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 20,250
Level 3—Significant unobservable inputs \| Senior Secured Loans—Second Lien \| Market Comparables
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 54,424		$ 143,270
Level 3—Significant unobservable inputs \| Senior Secured Loans—Second Lien \| Market Comparables \| Minimum \| Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.125		0.103
Level 3—Significant unobservable inputs \| Senior Secured Loans—Second Lien \| Market Comparables \| Maximum \| Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.140		0.143
Level 3—Significant unobservable inputs \| Senior Secured Loans—Second Lien \| Market Comparables \| Weighted Average \| Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.131		0.118
Level 3—Significant unobservable inputs \| Senior Secured Bonds \| Market Comparables
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 9,874		$ 10,074
Level 3—Significant unobservable inputs \| Senior Secured Bonds \| Market Comparables \| Minimum \| Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.075		0.069
Level 3—Significant unobservable inputs \| Senior Secured Bonds \| Market Comparables \| Maximum \| Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.085		0.079
Level 3—Significant unobservable inputs \| Senior Secured Bonds \| Market Comparables \| Weighted Average \| Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.080		0.074
Level 3—Significant unobservable inputs \| Unsecured Debt \| Market Comparables
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value			$ 19,256
Level 3—Significant unobservable inputs \| Unsecured Debt \| Market Comparables \| Minimum \| Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input			0.103
Level 3—Significant unobservable inputs \| Unsecured Debt \| Market Comparables \| Maximum \| Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input			0.113
Level 3—Significant unobservable inputs \| Unsecured Debt \| Market Comparables \| Weighted Average \| Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input			0.108
Level 3—Significant unobservable inputs \| Unsecured Debt \| Other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value			$ 35,118
Level 3—Significant unobservable inputs \| Preferred Equity \| Market Comparables
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 259,990		$ 316,767
Level 3—Significant unobservable inputs \| Preferred Equity \| Market Comparables \| Minimum \| Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.100		0.088
Level 3—Significant unobservable inputs \| Preferred Equity \| Market Comparables \| Minimum \| EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	12		9.5
Level 3—Significant unobservable inputs \| Preferred Equity \| Market Comparables \| Minimum \| Net Aircraft Book Value Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	1		1
Level 3—Significant unobservable inputs \| Preferred Equity \| Market Comparables \| Maximum \| Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.230		0.303
Level 3—Significant unobservable inputs \| Preferred Equity \| Market Comparables \| Maximum \| EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	13		10.5
Level 3—Significant unobservable inputs \| Preferred Equity \| Market Comparables \| Maximum \| Net Aircraft Book Value Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	1.1		1
Level 3—Significant unobservable inputs \| Preferred Equity \| Market Comparables \| Weighted Average \| Market Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.175		0.190
Level 3—Significant unobservable inputs \| Preferred Equity \| Market Comparables \| Weighted Average \| EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	12.5		10
Level 3—Significant unobservable inputs \| Preferred Equity \| Market Comparables \| Weighted Average \| Net Aircraft Book Value Multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	1		1
Level 3—Significant unobservable inputs \| Preferred Equity \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value			$ 83,647
Level 3—Significant unobservable inputs \| Preferred Equity \| Discounted Cash Flow \| Minimum \| Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input			0.113
Level 3—Significant unobservable inputs \| Preferred Equity \| Discounted Cash Flow \| Maximum \| Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input			0.123
Level 3—Significant unobservable inputs \| Preferred Equity \| Discounted Cash Flow \| Weighted Average \| Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input			0.118
Level 3—Significant unobservable inputs \| Sustainable Infrastructure Investments, LLC \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 39,427		$ 51,098
Level 3—Significant unobservable inputs \| Sustainable Infrastructure Investments, LLC \| Discounted Cash Flow \| Minimum \| Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.080		0.135
Level 3—Significant unobservable inputs \| Sustainable Infrastructure Investments, LLC \| Discounted Cash Flow \| Maximum \| Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.100		0.145
Level 3—Significant unobservable inputs \| Sustainable Infrastructure Investments, LLC \| Discounted Cash Flow \| Weighted Average \| Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.090		0.140
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 51,160		$ 481,623
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Minimum \| EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	2.7		1.8
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Minimum \| Production Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| MMBoe / d			27,946,000
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Minimum \| Proved Reserves Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| MMBoe			6,900,000
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Minimum \| Production Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| MMcfe / d	3,000,000,000		3,400,000,000
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Minimum \| Proved Reserves Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| Bcfe	0.7		0.8
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Minimum \| PV-10 Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.3		0.5
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Maximum \| EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	13		10.5
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Maximum \| Production Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| MMBoe / d			37,500,000
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Maximum \| Proved Reserves Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| MMBoe			10,300,000
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Maximum \| Production Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| MMcfe / d	3,600,000,000		3,700,000,000
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Maximum \| Proved Reserves Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| Bcfe	0.7		0.9
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Maximum \| PV-10 Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.4		0.9
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Weighted Average \| EBITDA Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	6		5.4
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Weighted Average \| Production Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| MMBoe / d			30,265,300
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Weighted Average \| Proved Reserves Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| MMBoe			7,600,000
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Weighted Average \| Production Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| MMcfe / d	3,300,000,000		3,550,000,000
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Weighted Average \| Proved Reserves Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input \| Bcfe	0.7		0.8
Level 3—Significant unobservable inputs \| Equity/Other \| Market Comparables \| Weighted Average \| PV-10 Multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.3		0.8
Level 3—Significant unobservable inputs \| Equity/Other \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 166,946		$ 2,488
Level 3—Significant unobservable inputs \| Equity/Other \| Discounted Cash Flow \| Minimum \| Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.080		0.080
Level 3—Significant unobservable inputs \| Equity/Other \| Discounted Cash Flow \| Maximum \| Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.171		0.330
Level 3—Significant unobservable inputs \| Equity/Other \| Discounted Cash Flow \| Weighted Average \| Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.165		0.238
Level 3—Significant unobservable inputs \| Equity/Other \| Other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 13,231		$ 1,885
Level 3—Significant unobservable inputs \| Equity/Other \| Option Valuation Model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, at fair value	$ 7,121		$ 5,734
Level 3—Significant unobservable inputs \| Equity/Other \| Option Valuation Model \| Minimum \| Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.550		0.315
Level 3—Significant unobservable inputs \| Equity/Other \| Option Valuation Model \| Maximum \| Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.650		0.551
Level 3—Significant unobservable inputs \| Equity/Other \| Option Valuation Model \| Weighted Average \| Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.600		0.366

[1]Security may be an obligation of one or more entities affiliated with the named company.[2]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.[3]See Note 8 for additional information regarding the fair value of the Company’s financial instruments.

Financing Arrangements - Schedu

Financing Arrangements - Schedule of Outstanding Financing Arrangements (Details) - USD ($) $ in Thousands				4 Months Ended	12 Months Ended
	Sep. 06, 2023	May 15, 2023	Feb. 14, 2023	May 15, 2023	Dec. 31, 2023	Dec. 31, 2022	Aug. 16, 2018
Debt Instrument [Line Items]
Amount Outstanding					$ 400,000	$ 762,751
Amount Available					100,000	$ 0
Average outstanding		7.49%		7.49%		7.25%
Secured Debt \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption percentage		100%
Senior Notes
Debt Instrument [Line Items]
Redemption percentage				100%
Senior Notes \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption percentage		100%
Senior Notes \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption percentage		100%
Barclays Facility \| Secured Overnight Finance Rating (SOFR)
Debt Instrument [Line Items]
Average outstanding	3%
Barclays Facility \| Line of Credit
Debt Instrument [Line Items]
Amount Outstanding					400,000
Amount Available					$ 100,000
Average outstanding					9.64%
Barclays Facility \| Line of Credit \| Secured Overnight Finance Rating (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate (percent)					3%
Debt instrument, variable rate floor	0%				0%
JPMorgan Facility \| Line of Credit
Debt Instrument [Line Items]
Amount Outstanding						$ 305,676
Amount Available						$ 0
Debt instrument, variable rate floor			0%
JPMorgan Facility \| Line of Credit \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate (percent)			3%			3%
Debt instrument, variable rate floor					0%
Senior Secured Notes \| Secured Debt
Debt Instrument [Line Items]
Stated interest rate						7.50%	7.50%
Amount Outstanding						$ 457,075
Amount Available						0
Fair value						$ 458,908

Financing Arrangements - Sche_2

Financing Arrangements - Schedule of Interest Expense (Details) - USD ($) $ in Thousands		4 Months Ended	12 Months Ended
	May 15, 2023	May 15, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Short-Term Debt [Line Items]
Direct Interest Expense			$ 20,284	$ 49,621	$ 46,298
Amortization of Deferred Financing Costs and Discount			3,414	6,095	7,824
Total Interest Expense			23,698	55,716	54,122
Secured Debt \| Debt Instrument, Redemption, Period One
Short-Term Debt [Line Items]
Redemption percentage	100%
Senior Notes
Short-Term Debt [Line Items]
Redemption percentage		100%
Senior Notes \| Debt Instrument, Redemption, Period One
Short-Term Debt [Line Items]
Redemption percentage	100%
Senior Notes \| Debt Instrument, Redemption, Period Two
Short-Term Debt [Line Items]
Redemption percentage	100%
Barclays Facility \| Line of Credit
Short-Term Debt [Line Items]
Direct Interest Expense			4,734	0	0
Amortization of Deferred Financing Costs and Discount			636	0	0
Total Interest Expense			5,370	0	0
JPMorgan Facility \| Line of Credit
Short-Term Debt [Line Items]
Direct Interest Expense			2,790	14,670	9,623
Amortization of Deferred Financing Costs and Discount			238	1,798	3,780
Total Interest Expense			3,028	16,468	13,403
Senior Secured Notes \| Secured Debt
Short-Term Debt [Line Items]
Direct Interest Expense			12,760	34,951	36,675
Amortization of Deferred Financing Costs and Discount			2,540	4,297	4,044
Total Interest Expense			$ 15,300	$ 39,248	$ 40,719

Financing Arrangements - Narrat

Financing Arrangements - Narrative (Details)				4 Months Ended		12 Months Ended
Financing Arrangements - Narrative (Details)	Sep. 06, 2023 USD ($) subsidiary	May 15, 2023	Feb. 14, 2023 USD ($)	Dec. 31, 2023 USD ($)	May 15, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 16, 2018 USD ($)
Debt Instrument [Line Items]
Amount outstanding					$ 557,446,000		$ 768,752,000
Average outstanding		7.49%			7.49%		7.25%
Debt instrument, interest rate, effective percentage							7.47%
Number of finance subsidiaries \| subsidiary	2
Barclays Facility \| Secured Overnight Finance Rating (SOFR)
Debt Instrument [Line Items]
Average outstanding	3%
Barclays Facility \| Secured Overnight Finance Rating (SOFR) \| Minimum
Debt Instrument [Line Items]
Average outstanding	1.90%
Barclays Facility \| Secured Overnight Finance Rating (SOFR) \| Maximum
Debt Instrument [Line Items]
Average outstanding	4.20%
Senior Notes
Debt Instrument [Line Items]
Redemption percentage					100%
Senior Notes \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption percentage		100%
Senior Notes \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption percentage		100%
Line of Credit \| Barclays Facility
Debt Instrument [Line Items]
Amount outstanding				$ 151,111,000
Average outstanding				9.64%		9.64%
Debt instrument, interest rate, effective percentage				8.78%		8.78%
Maximum aggregate purchase price	$ 500,000,000
Initial purchase price	400,000,000
Aggregate principal amount						$ 400,000,000
Carrying amount	394,437,000
Deferred financing costs	$ 6,199,000			$ 5,563,000		$ 5,563,000
Line of Credit \| Barclays Facility \| Secured Overnight Finance Rating (SOFR)
Debt Instrument [Line Items]
Debt instrument, variable rate floor	0%					0%
Basis spread on variable rate (percent)						3%
Line of Credit \| JPMorgan Facility
Debt Instrument [Line Items]
Debt instrument, variable rate floor			0%
Principal amount outstanding			$ 305,676,000
Line of Credit \| JPMorgan Facility \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, variable rate floor						0%
Basis spread on variable rate (percent)			3%				3%
Secured Debt \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption percentage		100%
Secured Debt \| Senior Secured Notes
Debt Instrument [Line Items]
Principal amount outstanding								$ 500,000,000
Stated interest rate							7.50%	7.50%

Senior Securities Asset Cover_3

Senior Securities Asset Coverage - Schedule of Senior Securities Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Total Amount Outstanding Exclusive of Treasury Securities	$ 400,000	$ 762,751	$ 775,667	$ 905,667	$ 1,236,667
Asset Coverage Per Unit	$ 4,905	$ 3,299	$ 3,066	$ 2,577	$ 2,924

Financial Highlights - Schedule

Financial Highlights - Schedule of Financial Highlights (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investment Company, Financial Highlights [Roll Forward]
Net asset value, beginning of year (in USD per Share)				$ 3.88				$ 3.59	$ 3.88	$ 3.59	$ 3.25	$ 5.43	$ 6.01
Results of operations
Net investment income (in USD per share)	$ 0.05	$ 0.04	$ 0.05	$ 0.04	$ 0.06	$ 0.03	$ 0.05	$ 0.02	0.18	0.16	0.09	0.19	0.46
Net realized gain (loss) and unrealized appreciation (depreciation) (in USD per share)									(0.44)	0.25	0.37	(2.20)	(0.54)
Net increase (decrease) in net assets resulting from operations (in USD per share)									(0.26)	0.41	0.46	(2.01)	(0.08)
Distribution Amount
Distributions from net investment income (in USD per share)									(0.19)	(0.12)	(0.12)	(0.14)	(0.50)
Distributions representing return of capital (in USD per share)									0	0	0	(0.03)	0
Net decrease in net assets resulting from shareholder distributions (in USD per share)	(0.0643)								(0.1892)	(0.1200)	(0.1200)	(0.17)	(0.50)
Capital share transactions
Issuance of common shares (in USD per share)									0	0	0	0	0
Net increase (decrease) in net assets resulting from capital share transactions (in USD per share)									0	0	0	0	0
Net asset value, end of year (in USD per share)	$ 3.43				$ 3.88				$ 3.43	$ 3.88	$ 3.59	$ 3.25	$ 5.43
Shares outstanding, end of year (in shares)	455,506,155				451,465,673				455,506,155	451,465,673	446,089,499	440,020,123	438,477,007
Total return									(6.89%)	11.39%	14.22%	(37.68%)	(1.83%)
Total return (without assuming reinvestment of distributions)									(6.70%)	11.29%	14.15%	(37.02%)	(1.33%)
Ratio/Supplemental Data:
Net assets, end of year	$ 1,562,055				$ 1,753,748				$ 1,562,055	$ 1,753,748	$ 1,602,323	$ 1,428,577	$ 2,379,605
Ratio of net investment income to average net assets									4.77%	4.02%	2.77%	4.82%	7.76%
Ratio of total operating expenses to average net assets									4.50%	6.78%	6.96%	8.20%	6.54%
Ratio of management fee offset to average net assets									(0.02%)	(0.15%)	(0.09%)	(0.04%)	(0.23%)
Ratio of net operating expenses to average net assets									4.48%	6.63%	6.87%	8.16%	6.31%
Ratio of interest expense to average net assets									1.39%	3.21%	3.46%	4.39%	3.40%
Ratio of federal and state taxes to average net assets									0.15%	0.13%	0%	0%	0%
Portfolio turnover									45.84%	16.15%	44.25%	26.54%	32.88%
Total amount of senior securities outstanding, exclusive of treasury securities	$ 400,000				$ 762,751				$ 400,000	$ 762,751	$ 775,667	$ 905,667	$ 1,236,667
Asset coverage per unit	491%				330%				491%	330%	307%	258%	292%
Ratio of net investment income to average net assets if advisor had not agreement to offset management fee payable									4.75%	3.87%	2.68%	4.78%	7.53%

Selected Quarterly Financial _3

Selected Quarterly Financial Data (Unaudited) - Schedule of Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Investment income	$ 42,708	$ 30,443	$ 41,476	$ 43,095	$ 59,535	$ 42,450	$ 47,073	$ 35,909	$ 157,722	$ 184,967	$ 150,707
Operating expenses
Total expenses and federal income and excise taxes	17,125	13,788	19,594	26,193	32,157	29,306	27,937	28,417
Less: Management fee offset	(4)	(63)	(19)	(255)	(13)	(208)	(1,700)	(698)
Net expenses and federal income and excise taxes	17,121	13,725	19,575	25,938	32,144	29,098	26,237	27,719
Net investment income	25,587	16,718	21,901	17,157	27,391	13,352	20,836	8,190	81,363	69,769	43,259
Realized and unrealized gain (loss)	(62,142)	(44,141)	(46,552)	(49,711)	2,849	(64,453)	(5,256)	181,593	(202,546)	114,733	162,616
Net increase (decrease) in net assets resulting from operations	$ (36,555)	$ (27,423)	$ (24,651)	$ (32,554)	$ 30,240	$ (51,101)	$ 15,580	$ 189,783	$ (121,183)	$ 184,502	$ 205,875
Per share information—basic and diluted
Net investment income (in USD per share)	$ 0.05	$ 0.04	$ 0.05	$ 0.04	$ 0.06	$ 0.03	$ 0.05	$ 0.02	$ 0.18	$ 0.16	$ 0.09	$ 0.19	$ 0.46
Net increase (decrease) in net assets resulting from operations, basic (in USD per share)	(0.08)	(0.06)	(0.05)	(0.07)	0.07	(0.11)	0.03	0.42	(0.27)	0.41	0.46
Net increase (decrease) in net assets resulting from operations, diluted (in USD per share)	$ (0.08)	$ (0.06)	$ (0.05)	$ (0.07)	$ 0.07	$ (0.11)	$ 0.03	$ 0.42	$ (0.27)	$ 0.41	$ 0.46
Weighted average shares outstanding, basic (in shares)	455,506,174	455,401,486	454,041,028	452,684,238	451,364,025	450,023,829	448,730,149	447,404,395	454,418,684	449,393,210	443,768,738
Weighted average shares outstanding, diluted (in shares)	455,506,174	455,401,486	454,041,028	452,684,238	451,364,025	450,023,829	448,730,149	447,404,395	454,418,684	449,393,210	443,768,738
Percentage of distributions qualified as excess interest income (percent)									93.30%

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event - Loan Total Return Swap Financing - Loans Payable $ in Thousands	Feb. 15, 2024 USD ($)
Subsequent Event [Line Items]
Utilization fee (percent)	0.85%
Minimum usage threshold amount	$ 100,000
SOFR
Subsequent Event [Line Items]
Basis spread on variable rate (percent)	1.65%