Standard Motor Products (SMP) 10-Q30 Oct 242024 Q3 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page - shares	9 Months Ended
Cover Page - shares	Sep. 30, 2024	Oct. 28, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Entity File Number	001-04743
Registrant Name	Standard Motor Products, Inc.
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	11-1362020
Entity Address, Address Line One	37-18 Northern Blvd.,
Entity Address, City or Town	Long Island City
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	11101
City Area Code	718
Local Phone Number	392-0200
Title of 12(b) Security	Common Stock, par value $2.00 per share
Trading Symbol	SMP
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		21,721,825
Entity Central Index Key	0000093389
Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Amendment flag	false

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Net sales		$ 399,265	$ 386,413	$ 1,120,497	$ 1,067,516
Cost of sales		277,899	271,653	798,162	760,220
Gross profit		121,366	114,760	322,335	307,296
Selling, general and administrative expenses		81,204	79,781	239,822	223,257
Restructuring and integration expenses		3,023	177	5,774	1,383
Other income (expense), net		0	4	5	74
Operating income		37,139	34,806	76,744	82,730
Other non-operating income, net		2,129	1,732	5,147	2,759
Interest expense		3,145	3,621	7,964	10,766
Total before income tax		36,123	32,917	73,927	74,723
Income tax expense		9,267	7,995	18,718	18,656
Earnings from continuing operations		26,856	24,922	55,209	56,067
Loss from discontinued operations, net of income taxes		(22,771)	(18,200)	(24,727)	(28,201)
Net earnings		4,085	6,722	30,482	27,866
Net earnings attributable to noncontrolling interest		275	63	785	152
Net earnings attributable to SMP	[1]	3,810	6,659	29,697	27,714
Net earnings (loss) attributable to SMP
Continuing operations		26,581	24,859	54,424	55,915
Discontinued operations		(22,771)	(18,200)	(24,727)	(28,201)
Net earnings attributable to SMP	[1]	$ 3,810	$ 6,659	$ 29,697	$ 27,714
Basic:
Continuing operations (in dollars per share)		$ 1.22	$ 1.14	$ 2.50	$ 2.58
Discontinued operations (in dollars per share)		(1.04)	(0.83)	(1.14)	(1.30)
Net earnings attributable to SMP per common share (in dollars per share)		0.18	0.31	1.36	1.28
Diluted:
Continuing operations (in dollars per share)		1.20	1.12	2.45	2.52
Discontinued operations (in dollars per share)		(1.03)	(0.82)	(1.11)	(1.27)
Net earnings attributable to SMP per common share (in dollars per share)		0.17	0.30	1.34	1.25
Dividend declared per common share (in dollars shares)		$ 0.29	$ 0.29	$ 0.87	$ 0.87
Weighted average number of common shares, basic (in shares)		21,716,083	21,727,119	21,802,164	21,675,699
Weighted average number of common shares, diluted (in shares)		22,154,222	22,253,723	22,225,444	22,198,131

[1] Throughout this Form 10-Q, “SMP” refers to Standard Motor Products, Inc. and subsidiaries.

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net earnings	$ 4,085	$ 6,722	$ 30,482	$ 27,866
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	2,475	(3,950)	(2,493)	36
Derivative instruments	(2,552)	1,708	(1,082)	2,162
Pension and postretirement plans	(3)	(3)	(8)	(10)
Other comprehensive income, net of tax	(80)	(2,245)	(3,583)	2,188
Comprehensive income	4,005	4,477	26,899	30,054
Comprehensive income (loss) attributable to noncontrolling interest, net of tax:
Net earnings attributable to noncontrolling interest	275	63	785	152
Foreign currency translation adjustments	32	47	17	(63)
Comprehensive income (loss) attributable to noncontrolling interest, net of tax	307	110	802	89
Comprehensive income attributable to SMP	$ 3,698	$ 4,367	$ 26,097	$ 29,965

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
CURRENT ASSETS:
Cash and cash equivalents	$ 26,348	$ 32,526
Accounts receivable, less allowances for discounts and expected credit losses of $8,697 and $8,045 for 2024 and 2023, respectively	217,130	160,282
Inventories	503,015	507,075
Unreturned customer inventories	17,843	18,240
Prepaid expenses and other current assets	28,873	26,100
Total current assets	793,209	744,223
Property, plant and equipment, net of accumulated depreciation of $271,556 and $259,656 for 2024 and 2023, respectively	138,490	121,872
Operating lease right-of-use assets	96,039	100,065
Goodwill	134,725	134,729
Other intangibles, net	85,837	92,308
Deferred income taxes	45,315	40,533
Investments in unconsolidated affiliates	23,914	24,050
Other assets	33,012	35,267
Total assets	1,350,541	1,293,047
CURRENT LIABILITIES:
Current portion of term loan and other debt	2,685	5,029
Accounts payable	112,404	107,455
Sundry payables and accrued expenses	69,666	63,303
Accrued customer returns	62,326	38,238
Accrued core liability	15,226	18,399
Accrued rebates	53,163	42,278
Payroll and commissions	37,050	29,561
Total current liabilities	352,520	304,263
Long-term debt	140,163	151,182
Noncurrent operating lease liabilities	86,259	88,974
Other accrued liabilities	28,611	25,742
Accrued asbestos liabilities	89,544	72,013
Total liabilities	697,097	642,174
Commitments and contingencies
Stockholders’ equity:
Authorized – 30,000,000 shares; issued 23,936,036 shares	47,872	47,872
Capital in excess of par value	103,818	101,751
Retained earnings	583,919	573,226
Accumulated other comprehensive income	(9,574)	(5,974)
Treasury stock – at cost (2,215,186 shares and 2,018,982 shares in 2024 and 2023, respectively)	(87,202)	(81,811)
Total SMP stockholders’ equity	638,833	635,064
Noncontrolling interest	14,611	15,809
Total stockholders’ equity	653,444	650,873
Total liabilities and stockholders’ equity	$ 1,350,541	$ 1,293,047

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
CURRENT ASSETS:
Accounts Receivable, allowance for discounts and expected Credit Losses	$ 8,697	$ 8,045
Property, plant and equipment, accumulated depreciation	$ 271,556	$ 259,656
Stockholders’ equity:
Common stock, par value (in dollars per share)	$ 2	$ 2
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Common stock, shares issued (in shares)	23,936,036	23,936,036
Treasury stock - at cost (in shares)	2,215,186	2,018,982

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 30,482	$ 27,866
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	22,008	21,461
Amortization of deferred financing cost	1,655	370
Increase to allowance for expected credit losses	461	333
Increase to inventory reserves	3,731	2,010
Equity income from joint ventures	(3,520)	(2,181)
Employee stock ownership plan allocation	2,090	2,225
Stock-based compensation	4,464	5,243
Increase in deferred income taxes	(4,408)	(3,299)
Loss on discontinued operations, net of tax	24,727	28,201
Change in assets and liabilities:
Increase in accounts receivable	(59,040)	(38,850)
Decrease in inventories	2,895	54,286
Increase (decrease) in prepaid expenses and other current assets	(2,739)	2,916
Increase in accounts payable	4,487	15,852
Increase in sundry payables and accrued expenses	45,470	12,345
Net change in other assets and liabilities	5,437	4,115
Net cash provided by operating activities	78,200	132,893
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of and investment in businesses	0	(3,954)
Cash acquired in step acquisition	0	6,779
Capital expenditures	(34,136)	(17,977)
Other investing activities	18	95
Net cash used in investing activities	(34,118)	(15,057)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of term loan	(92,500)	(3,750)
Net borrowings (repayments) under revolving credit facilities	76,500	(88,350)
Net borrowings (repayments) of other debt and lease obligations	2,578	(49)
Purchase of treasury stock	(10,409)	0
Payments of debt issuance costs	(4,183)	0
Increase in overdraft balances	549	253
Dividends paid	(19,004)	(18,846)
Dividends paid to noncontrolling interest	(1,200)	(255)
Net cash used in financing activities	(47,669)	(110,997)
Effect of exchange rate changes on cash	(2,591)	496
Net (decrease) increase in cash and cash equivalents	(6,178)	7,335
Cash and cash equivalents, beginning of period	32,526	21,150
Cash and cash equivalents, ending of period	26,348	28,485
Cash paid during the period for:
Interest	7,973	11,749
Income taxes	10,947	11,352
Noncash financing activity:
Dividend payable to noncontrolling interest	$ 800	$ 0

CONSOLIDATED STATEMENT OF CHANG

CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total SMP	Non- Controlling Interest
Beginning balance at Dec. 31, 2022	$ 621,038	$ 47,872	$ 105,615	$ 564,242	$ (12,470)	$ (95,239)	$ 610,020	$ 11,018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	27,866			27,714			27,714	152
Noncontrolling interest in step acquisition	5,273							5,273
Other comprehensive income (loss), net of tax	2,188				2,251		2,251	(63)
Cash dividends paid	(18,846)			(18,846)			(18,846)
Dividends to noncontrolling interest	(255)							(255)
Stock-based compensation	5,243		2,427			2,816	5,243
Employee Stock Ownership Plan	2,966		16			2,950	2,966
Ending balance at Sep. 30, 2023	645,473	47,872	108,058	573,110	(10,219)	(89,473)	629,348	16,125
Beginning balance at Jun. 30, 2023	640,415	47,872	106,529	572,753	(7,927)	(89,554)	629,673	10,742
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	6,722			6,659			6,659	63
Noncontrolling interest in step acquisition	5,273							5,273
Other comprehensive income (loss), net of tax	(2,245)				(2,292)		(2,292)	47
Cash dividends paid	(6,302)			(6,302)			(6,302)
Stock-based compensation	1,610		1,529			81	1,610
Ending balance at Sep. 30, 2023	645,473	47,872	108,058	573,110	(10,219)	(89,473)	629,348	16,125
Beginning balance at Dec. 31, 2023	650,873	47,872	101,751	573,226	(5,974)	(81,811)	635,064	15,809
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	30,482			29,697			29,697	785
Other comprehensive income (loss), net of tax	(3,583)				(3,600)		(3,600)	17
Cash dividends paid	(19,004)			(19,004)			(19,004)
Purchase of treasury stock	(10,409)					(10,409)	(10,409)
Dividends to noncontrolling interest	(2,000)							(2,000)
Stock-based compensation	4,298		2,064			2,234	4,298
Employee Stock Ownership Plan	2,787		3			2,784	2,787
Ending balance at Sep. 30, 2024	653,444	47,872	103,818	583,919	(9,574)	(87,202)	638,833	14,611
Beginning balance at Jun. 30, 2024	654,322	47,872	102,738	586,407	(9,462)	(87,537)	640,018	14,304
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	4,085			3,810			3,810	275
Other comprehensive income (loss), net of tax	(80)				(112)		(112)	32
Cash dividends paid	(6,298)			(6,298)			(6,298)
Stock-based compensation	1,415		1,080			335	1,415
Ending balance at Sep. 30, 2024	$ 653,444	$ 47,872	$ 103,818	$ 583,919	$ (9,574)	$ (87,202)	$ 638,833	$ 14,611

Basis of Presentation

Basis of Presentation	9 Months Ended
Basis of Presentation	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Standard Motor Products, Inc. and its subsidiaries (referred to hereinafter in these notes to the consolidated financial statements as “we,” “us,” “our,” “SMP,” or the “Company”) is a leading manufacturer and distributor of premium replacement parts in the automotive aftermarket, and a custom-engineered solutions provider to vehicle and equipment manufacturers in diverse non-aftermarket end markets. Our automotive aftermarket is comprised of two segments, Vehicle Control and Temperature Control, while our Engineered Solutions segment offers a broad array of conventional and future-oriented technologies in markets for commercial and light vehicles, construction, agriculture, power sports, marine, hydraulics and lawn and garden. We sell our products primarily to retailers, warehouse distributors, original equipment manufacturers and original equipment service part operations in the United States, Canada, Europe, Asia, Mexico and other Latin American countries. The accompanying unaudited financial information should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2023. The unaudited consolidated financial statements include our accounts and all domestic and international companies in which we have more than a 50% equity ownership, except in instances where the minority shareholder maintains substantive participating rights, in which case we follow the equity method of accounting. In instances where we have more than a 50% equity ownership and the minority shareholder does not maintain substantive participating rights, our consolidated financial statements include the accounts of the company on a consolidated basis with its net income and equity reported at amounts attributable to both our equity position and that of the noncontrolling interest. Investments in unconsolidated affiliates are accounted for on the equity method, as we do not have a controlling financial interest but have the ability to exercise significant influence. All significant inter-company items have been eliminated. The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. The results of operations for the interim periods are not necessarily indicative of the results of operations for the entire year. Reclassification Certain prior period amounts in the accompanying consolidated financial statements and related notes have been reclassified to conform to the 2024 presentation.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
Summary of Significant Accounting Policies	Sep. 30, 2024
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies The preparation of consolidated annual and quarterly financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amount of assets and liabilities, the disclosure of contingent assets and liabilities at the date of our consolidated financial statements, and the reported amounts of revenue and expenses during the reporting periods. We have made a number of estimates and assumptions in the preparation of these consolidated financial statements. We can give no assurance that actual results will not differ from those estimates. Although we do not believe that there is a reasonable likelihood that there will be a material change in the future estimates, or in the assumptions that we use in calculating the estimates, the uncertain future effects, if any, of disruptions in the supply chain caused by geo-political risks, future increases in interest rates, inflation, macroeconomic uncertainty, and other unforeseen changes in the industry, or business, could materially impact the estimates, and may have a material adverse effect on our business, financial condition and results of operations. Some of the more significant estimates include allowances for expected credit losses, cash discounts, valuation of inventory, valuation of long-lived assets, goodwill and other intangible assets, depreciation and amortization of long-lived assets, product liability exposures, asbestos, environmental and litigation matters, valuation of deferred tax assets, share based compensation and sales returns and other allowances. There have been no material changes to our critical accounting policies and estimates from the information provided in Note 1 of the notes to our consolidated financial statements in our Annual Report on Form 10-K for the year ended December 31, 2023. Recently Issued Accounting Pronouncements Standards not yet adopted as of September 30, 2024 Standard Description Effective date Effects on the financial statements or other significant matters ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures ASU 2023-07 will improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses on an interim and annual basis. ASU 2023-07 expands segment disclosures by requiring disclosure of (1) significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit or loss; (2) the amount and description of the composition of other segment items to reconcile to segment profit and loss; and (3) the CODM’s title and position and how the CODM uses the reported segment measures to allocate resources. Additionally, ASU 2023-07 requires interim disclosures of all reportable segment profit or loss and assets previously required annually by Topic 280. The ASU is effective for the fiscal years beginning after December 15, 2023, which for us is December 31, 2024, and all subsequent interim periods, with full retrospective application required to all prior periods presented. Early adoption is permitted. The new standard will require expanding our segment disclosure to include additional segment level information. We are currently evaluating the full impact of adopting ASU 2023-07 on our consolidated financial statements, disclosures, processes and controls. On an ongoing basis, we will continue to assess the impact of the new standard through our planned date of adoption of December 31, 2024. ASU 2023-09, Income Taxes (Topic 270): Improvements to Income Tax Disclosures ASU 2023-09 will improve transparency and decision making usefulness of income tax disclosures. ASU 2023-09 will expand the annual required effective income tax rate reconciliation disclosures to include (1) eight specific categories of rate reconciling items; (2) additional information for reconciling items that meet or exceed a quantitative threshold; and (3) expand the required disclosures to include reconciling percentages as well as reported amounts. Additionally, ASU 2023-09 will expand required annual disclosures of income taxes paid to include the disaggregation by federal, state and foreign jurisdictions. The ASU is effective for annual reporting periods beginning after December 15, 2024, which for us is December 31, 2025, with prospective application. Early adoption and retrospective application are permitted. The new standard will require expanding our annual income tax disclosures in our financial statements. We are currently evaluating the full impact of adopting ASU 2023-09 on our consolidated financial statements, disclosures, processes and controls. On an ongoing basis, we will continue to assess the impact of the new standard through our planned date of adoption of December 31, 2025. We have reviewed all other recently issued accounting pronouncements and concluded they were either not applicable or not expected to have a material impact on the Company’s consolidated financial statements.

Business Acquisitions and Inves

Business Acquisitions and Investments	9 Months Ended
Business Acquisitions and Investments	Sep. 30, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Business Acquisitions and Investments	Business Acquisitions and Investments Nissens Automotive Acquisition In July 2024, we entered into an agreement to acquire all the outstanding shares of AX V Nissens III APS and its subsidiaries (“Nissens Automotive”), a leading European manufacturer and distributor of aftermarket engine cooling and air conditioning products with a growing array of vehicle control technologies, for €360 million (approximately $388 million) in cash, subject to adjustment at closing. We expect to fund the entire purchase price and related transaction costs with borrowings under our 2024 Credit Agreement. For additional information on our Credit Agreement see Note 9, “Credit Facilities and Long-Term Debt”. The transaction is expected to be completed by the end of 2024, subject to customary closing requirements. Investment in Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. In April 2014, we formed Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. (“Gwo Yng”), a 50/50 joint venture with Gwo Yng Enterprise Co., Ltd., a China-based manufacturer of air conditioner accumulators, filter driers, hose assemblies and switches. We acquired our 50% interest in the joint venture for approximately $14 million. In March 2018, we acquired an additional 15% equity interest in the joint venture for Chinese yuan renminbi 26,475,583 (approximately $4.2 million), thereby increasing our equity interest in the joint venture to 65%. While we increased our equity interest in the joint venture to 65%, the minority shareholder maintained substantive participating rights that allowed it to participate in certain significant financial and operating decisions that occur in the ordinary course of business. As a result, we continued to account for our investment in the joint venture under the equity method of accounting. In July 2023, we acquired an additional 15% equity interest in the joint venture for Chinese yuan renminbi 27,378,290 (approximately $4 million), thereby increasing our equity interest in Gwo Yng to 80%. In connection with the transaction, we amended and restated the charter documents of Gwo Yng to remove all minority shareholder substantive participating rights, giving SMP control of Gwo Yng. As a result, as of the closing date of the transaction, Gwo Yng was accounted for as a business combination achieved in stages (“a step acquisition”). Accordingly, commencing on the closing of the transaction, we reported the results of Gwo Yng on a consolidated basis with the minority ownership interest reported as a noncontrolling interest. The following table summarizes the allocation of the total step acquisition purchase consideration to the identifiable assets acquired and liabilities assumed based on their fair values (in thousands): Total purchase consideration (a) $ 21,725 Assets acquired and liabilities assumed: Cash and cash equivalents $ 6,779 Receivables 5,912 Inventory 5,945 Other current assets 528 Property, plant and equipment, net 2,924 Operating lease right-of-use assets 4,372 Intangible assets (b) 532 Goodwill 2,208 Long term investments and other assets 7,257 Current liabilities (6,004) Noncurrent operating lease liabilities (3,455) Subtotal 26,998 Fair value of acquired noncontrolling interest (5,273) Total purchase consideration allocated to net assets acquired $ 21,725 (a) Total purchase consideration is the sum of the fair value of the previously held equity investment interest in Gwo Yng of $17.7 million and the cash paid of $4 million for the acquisition of the additional 15% equity ownership interest. (b) Intangible assets consists of customer relationships of $0.4 million and capitalized software of $0.1 million. Intangible assets of $0.4 million consisting of customer relationships is amortized on a straight-line basis over the estimated useful life of 10 years. Goodwill of $2.2 million was allocated to the Temperature Control and Engineered Solutions segments in the amounts of $1.2 million and $1 million, respectively. The goodwill reflects relationships, business specific knowledge and the replacement cost of an assembled workforce associated with personal reputations

Restructuring and Integration E

Restructuring and Integration Expenses	9 Months Ended
Restructuring and Integration Expenses	Sep. 30, 2024
Restructuring and Related Activities [Abstract]
Restructuring and Integration Expenses	Restructuring and Integration Expenses Separation Program During the second quarter of 2024 we offered a voluntary retirement incentive package of severance and other benefit enhancements to eligible employees in the United States and Canada as part of our commitment to optimizing our cost structure and providing professional development opportunities to our employees. The offer period ended on June 14, 2024. During the quarter, we expanded the program to include involuntary separations. Costs primarily comprise of compensation expense and enhanced medical benefits, and are charged to restructuring and integration expenses in our statement of operations as a one-time termination benefit. Voluntary retirement incentive costs are recognized when the employee accepted the offer or over their remaining period of service based on the agreed retirement date. The criteria to recognize involuntary separation costs were met during the quarter and costs were recorded either during the quarter or over the remaining service period for the affected employees. We anticipate that the program will be substantially complete by the end of 2027. Additional pre-tax restructuring costs related to the program are expected to be $1.3 million in the remainder of 2024, $0.6 million in 2025, and $0.1 million in 2026 for an aggregate cost of approximately $7.6 million. Activity for the nine months ended September 30, 2024 related to the separation program workforce reduction consisted of the following (in thousands): Exit activity liability at December 31, 2023 $ — Restructuring and integration costs: Amounts provided for during 2024 (a) 5,602 Stock-based compensation 150 Cash payments (959) Foreign currency exchange rate changes 1 Exit activity liability at September 30, 2024 $ 4,794 (a) Restructuring and integration expenses incurred during the nine months ended September 30, 2024 consist of $2.7 million in our Vehicle Control segment, $0.6 million in our Temperature Control segment, $0.6 million in our Engineered Solutions segment and $1.7 million in our Other segment. Cost Reduction Initiative During the fourth quarter of 2022, to further our ongoing efforts to improve operating efficiencies and reduce costs, we announced plans for a reduction in our sales force, and initiated plans to relocate certain product lines from our Independence, Kansas manufacturing facility and from our St. Thomas, Canada manufacturing facility to our manufacturing facilities in Reynosa, Mexico. We anticipate that the Cost Reduction Initiative will be substantially completed by the end of 2024. Additional restructuring costs related to the initiative are expected to be immaterial. Activity for the nine months ended September 30, 2024 related to the cost reduction initiative consisted of the following (in thousands): Workforce Other Exit Total Exit activity liability at December 31, 2023 $ 1,729 $ — $ 1,729 Restructuring and integration costs: Amounts provided for during 2024 (a) (45) 217 172 Cash payments (1,315) (217) (1,532) Foreign currency exchange rate changes (22) — (22) Exit activity liability at September 30, 2024 $ 347 $ — $ 347 (a) Restructuring and integration expenses incurred during the nine months ended September 30, 2024 consist of $61 thousand in our Vehicle Control segment, $59 thousand in our Temperature Control segment and $52 thousand in our Engineered Solutions segment. Restructuring and integration activities are included within “sundry payables and accrued expenses” and “other accrued liabilities” in the consolidated balance sheet.

Sale of Receivables

Sale of Receivables	9 Months Ended
Sale of Receivables	Sep. 30, 2024
Receivables [Abstract]
Sale of Receivables	Sale of Receivables We are party to several supply chain financing arrangements, in which we may sell certain of our customers’ trade accounts receivable to such customers’ financial institutions. We sell our undivided interests in certain of these receivables at our discretion when we determine that the cost of these arrangements is less than the cost of servicing our receivables with existing debt. Under the terms of the agreements, we retain no rights or interest, have no obligations with respect to the sold receivables, and do not service the receivables after the sale. As such, these transactions are accounted for as a sale. Pursuant to these agreements, we sold $285.4 million and $686.3 million of receivables during the three and nine months ended September 30, 2024, respectively, and $260.4 million and $643 million for the comparable periods in 2023. Receivables presented at financial institutions and not yet collected as of September 30, 2024 were approximately $1.8 million and remained in our accounts receivable balance as of that date. All receivables sold were reflected as a reduction of accounts receivable in the consolidated balance sheet at the time of sale. A charge in the amount of $14.9 million and $38.3 million related to the sale of receivables was included in selling, general and administrative expense in our consolidated statements of operations for the three and nine months ended September 30, 2024, respectively, and $14.6 million and $36.1 million for the comparable periods in 2023. To the extent that these arrangements are terminated, our financial condition, results of operations, cash flows and liquidity could be adversely affected by extended payment terms, or delays or failures in collecting trade accounts receivable. The utility of the supply chain financing arrangements also depends upon a benchmark reference rate for the purpose of determining the discount rate applicable to each arrangement. If the benchmark reference rate increases significantly, we may be negatively impacted as we may not be able to pass these added costs on to our customers, which could have a material and adverse effect upon our financial condition, results of operations and cash flows.

Inventories

Inventories	9 Months Ended
Inventories	Sep. 30, 2024
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories, which are stated at the lower of cost (determined by means of the first-in, first-out method) and net realizable value, consist of the following, in thousands: September 30, December 31, Finished goods $ 294,153 $ 302,557 Work in process 18,406 18,503 Raw materials 190,456 186,015 Subtotal 503,015 507,075 Unreturned customer inventories 17,843 18,240 Total inventories $ 520,858 $ 525,315

Acquired Intangible Assets

Acquired Intangible Assets	9 Months Ended
Acquired Intangible Assets	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Acquired Intangible Assets	Acquired Intangible Assets Acquired identifiable intangible assets consist of the following, in thousands: September 30, December 31, Customer relationships $ 159,934 $ 159,641 Patents, developed technology and intellectual property 14,123 14,123 Trademarks and trade names 8,880 8,880 Non-compete agreements 3,308 3,295 Supply agreements 800 800 Leaseholds 160 160 Total acquired intangible assets 187,205 186,899 Less: Accumulated amortization (a) (102,379) (95,681) Net acquired intangible assets $ 84,826 $ 91,218 (a) Applies to all intangible assets, except for trademarks and trade names totaling $2.6 million, which have indefinite useful lives and, as such, are not being amortized. Total amortization expense for acquired intangible assets was $2.1 million and $6.4 million for the three and nine months ended September 30, 2024, respectively, and $2.1 million and $6.4 million for the comparable periods in 2023. Based on the current estimated useful lives assigned to our intangible assets, amortization expense is estimated to be $2.1 million for the remainder of 2024, $8.5 million in 2025, $8.5 million in 2026, $8.5 million in 2027 and $54.6 million in the aggregate for the years 2028 through 2041.

Leases

Leases	9 Months Ended
Leases	Sep. 30, 2024
Leases [Abstract]
Leases	Leases We have operating and finance leases for our manufacturing facilities, warehouses, office space, automobiles, and certain equipment. Our leases have remaining lease terms of up to ten years, some of which may include one or more five-year renewal options. We have not included any of the renewal options in our operating lease payments as we concluded that it is not reasonably certain that we will exercise any of these renewal options. Leases with an initial term of twelve months or less are not recorded on the balance sheet. Operating lease expense is recognized on a straight-line basis over the lease term. Finance leases are not material. The following tables provide quantitative disclosures related to our operating leases and include all operating leases acquired from the date of acquisition (in thousands, except where otherwise indicated): Balance Sheet Information September 30, December 31, Assets Operating lease right-of-use assets $ 96,039 $ 100,065 Liabilities Sundry payables and accrued expenses $ 16,848 $ 17,139 Noncurrent operating lease liabilities 86,259 88,974 Total operating lease liabilities $ 103,107 $ 106,113 Weighted Average Remaining Lease Term 7.9 Years 8.3 Years Weighted Average Discount Rate 4.9 % 4.8 % Three Months Ended Nine Months Ended Lease Expense 2024 2023 2024 2023 Lease expense $ 4,548 $ 4,762 $ 14,220 $ 11,647 Variable and other lease expense (a) 1,545 1,354 2,953 2,637 Total lease costs $ 6,093 $ 6,116 $ 17,173 $ 14,284 (a) Variable and other lease expense relate to non-lease components such as maintenance, property taxes, etc., and operating lease expense for leases with an initial term of 12 months or less which are not material. Nine Months Ended 2024 2023 Supplemental Cash Flow Information Cash paid for the amounts included in the measurement of lease liabilities $ 13,253 $ 8,212 Right-of-use assets obtained in exchange for new lease obligations (a) $ 6,902 $ 61,929 (a) Includes $4.7 million of right-of-use assets related to the lease modification and extension for our manufacturing facility in Bialystok, Poland during the nine months ended September 30, 2024 and $27.8 million of right-of-use assets related to the lease modification and extension for our distribution center and office in Lewisville, Texas; $26.1 million of right-of-use assets related to the new distribution center in Shawnee, Kansas; and $4.4 million of right-of-use assets obtained in Gwo Yng step-acquisition during the nine months ended September 30, 2023. Minimum Lease Payments At September 30, 2024, we are obligated to make minimum lease payments through 2034, under operating leases, which are as follows: 2024 $ 4,711 2025 17,058 2026 15,711 2027 14,417 2028 12,647 Thereafter 62,118 Total lease payments $ 126,662 Less: Interest (23,555) Present value of lease liabilities $ 103,107
Leases	Leases We have operating and finance leases for our manufacturing facilities, warehouses, office space, automobiles, and certain equipment. Our leases have remaining lease terms of up to ten years, some of which may include one or more five-year renewal options. We have not included any of the renewal options in our operating lease payments as we concluded that it is not reasonably certain that we will exercise any of these renewal options. Leases with an initial term of twelve months or less are not recorded on the balance sheet. Operating lease expense is recognized on a straight-line basis over the lease term. Finance leases are not material. The following tables provide quantitative disclosures related to our operating leases and include all operating leases acquired from the date of acquisition (in thousands, except where otherwise indicated): Balance Sheet Information September 30, December 31, Assets Operating lease right-of-use assets $ 96,039 $ 100,065 Liabilities Sundry payables and accrued expenses $ 16,848 $ 17,139 Noncurrent operating lease liabilities 86,259 88,974 Total operating lease liabilities $ 103,107 $ 106,113 Weighted Average Remaining Lease Term 7.9 Years 8.3 Years Weighted Average Discount Rate 4.9 % 4.8 % Three Months Ended Nine Months Ended Lease Expense 2024 2023 2024 2023 Lease expense $ 4,548 $ 4,762 $ 14,220 $ 11,647 Variable and other lease expense (a) 1,545 1,354 2,953 2,637 Total lease costs $ 6,093 $ 6,116 $ 17,173 $ 14,284 (a) Variable and other lease expense relate to non-lease components such as maintenance, property taxes, etc., and operating lease expense for leases with an initial term of 12 months or less which are not material. Nine Months Ended 2024 2023 Supplemental Cash Flow Information Cash paid for the amounts included in the measurement of lease liabilities $ 13,253 $ 8,212 Right-of-use assets obtained in exchange for new lease obligations (a) $ 6,902 $ 61,929 (a) Includes $4.7 million of right-of-use assets related to the lease modification and extension for our manufacturing facility in Bialystok, Poland during the nine months ended September 30, 2024 and $27.8 million of right-of-use assets related to the lease modification and extension for our distribution center and office in Lewisville, Texas; $26.1 million of right-of-use assets related to the new distribution center in Shawnee, Kansas; and $4.4 million of right-of-use assets obtained in Gwo Yng step-acquisition during the nine months ended September 30, 2023. Minimum Lease Payments At September 30, 2024, we are obligated to make minimum lease payments through 2034, under operating leases, which are as follows: 2024 $ 4,711 2025 17,058 2026 15,711 2027 14,417 2028 12,647 Thereafter 62,118 Total lease payments $ 126,662 Less: Interest (23,555) Present value of lease liabilities $ 103,107

Credit Facilities and Long-Term

Credit Facilities and Long-Term Debt	9 Months Ended
Credit Facilities and Long-Term Debt	Sep. 30, 2024
Debt Disclosure [Abstract]
Credit Facilities and Long-Term Debt	Credit Facilities and Long-Term Debt Total debt outstanding is summarized as follows, in thousands: September 30, December 31, Credit facility – term loan due 2027 $ — $ 92,500 Credit facility – revolver due 2027 — 63,500 Credit facility – revolver due 2029 140,000 — Other 2,848 211 Total debt $ 142,848 $ 156,211 Current maturities of debt $ 2,685 $ 5,029 Long-term debt 140,163 151,182 Total debt $ 142,848 $ 156,211 Term Loans and Revolving Credit Facilities In May 2024 and July 2024, the Company amended it's then-existing Credit Agreement with JPMorgan Chase Bank, N.A., as administrative agent, and a syndicate of lenders ("2022 Credit Agreement"), to transition from the Canadian Dollar Offered Rate (“CDOR”) to the Canadian Overnight Repo Rate Average (“CORRA”) for benchmark borrowings denominated in Canadian dollars and to provide for a new $125 million term loan and the use of funds available under the revolving credit facility to finance the acquisition of Nissens Automotive and related transaction costs. For additional information on our agreement to acquire Nissens Automotive see Note 3, “Business Acquisitions and Investments.” In September 2024, the Company refinanced its existing 2022 Credit Agreement with a new five-year Credit Agreement with JPMorgan Chase Bank, N.A., as administrative agent, and a syndicate of lenders (“2024 Credit Agreement”). The 2024 Credit Agreement matures on September 16, 2029 and provides for an approximately $750 million credit facility, comprised of a $430 million multi-currency revolving credit facility ("global tranche"); (ii) a $10 million multi-currency revolving credit facility, that will be available to one or more wholly-owned Danish subsidiaries of the Company ("Danish tranche"); (iii) a $200 million delayed draw term loan facility in U.S. dollars; and (iv) a 100 million euros delayed draw term loan facility. The revolving credit facility has a $25 million sublimit for the issuance of letters of credit, and a $30 million sublimit for the borrowing of swingline loans. Borrowings under the 2024 Credit Agreement were used to repay all outstanding borrowings under the 2022 Credit Agreement and will be used for general corporate purposes of the Company and its subsidiaries, and to finance the Company’s acquisition of Nissens Automotive and related transaction costs. The term loans amortize in quarterly installments of 1.25% in each of the first two years following the funding, 1.875% for the next two years, and 2.50% in each quarter thereafter. The Company may request up to two one-year extensions of the maturity date. The Company may, subject to customary conditions, increase the global tranche or obtain incremental term loans in an aggregate amount not to exceed (x) the greater of (i) $168 million and (ii) 100% of consolidated EBITDA for the four fiscal quarters ended most recently before such date, plus (y) any voluntary prepayment of term loans, plus (z) any amount that, after giving effect to the increase, the pro forma First Lien Net Leverage Ratio (as defined in the 2024 Credit Agreement) does not exceed 2.75 to 1.00. The Company may also, subject to customary conditions, request to increase the Danish tranche by up to $5 million. Borrowings bear interest at the applicable interest rate index selected by the Company based on the particular currency borrowed plus a credit spread adjustment depending on the index, and a margin ranging from 1.25% to 2.25% per annum based on the total net leverage ratio of the Company and its restricted subsidiaries. The Company may select interest periods of one, three or six months depending on the index. Interest is payable at the end of the selected interest period, but no less frequently than quarterly. The Company may prepay the borrowings, in whole or in part, at any time without premium or penalty, subject to certain conditions. The Company’s obligations under the 2024 Credit Agreement are guaranteed by its material domestic subsidiaries (each, a “Guarantor”), and secured by a first priority perfected security interest in substantially all of the existing and future personal property of the Company and each Guarantor, subject to certain exceptions. The collateral security described above also secures certain banking services obligations and interest rate swaps and currency or other hedging obligations of the Company owing to any of the then existing lenders or any affiliates thereof. Outstanding borrowings at September 30, 2024 under the credit agreements were $140 million and classified as long-term debt. Outstanding borrowings at December 31, 2023 were $156 million, consisting of current borrowings of $5 million and long-term debt of $151 million. Letters of credit outstanding under the credit agreements were $2.3 million at September 30, 2024 and December 31, 2023. At September 30, 2024, the weighted average interest rate under the 2024 Credit Agreement was 5%, which consisted of $140 million in borrowings under Term SOFR, adjusted for the impact of the interest rate swap agreement on $100 million of borrowings. At December 31, 2023, the weighted average interest rate under the 2022 Credit Agreement was 5%, which consisted of $156 million in borrowings at 5% under Term SOFR, adjusted for the impact of the interest rate swap agreement on $100 million of borrowings. During the nine months ended September 30, 2024, our average daily alternative base rate loan balance was $0.8 million, compared to a balance of $0.1 million for the nine months ended September 30, 2023 and a balance of $0.1 million for the year ended December 31, 2023. The 2024 Credit Agreement contains customary covenants limiting, among other things, the incurrence of additional indebtedness, the creation of liens, mergers, consolidations, liquidations and dissolutions, sales of assets, dividends and other payments in respect of equity interests, acquisitions, investments, loans and guarantees, subject, in each case, to customary exceptions, thresholds and baskets. The 2024 Credit Agreement also contains customary events of default. Polish Overdraft Facility In November 2023, our Polish subsidiary, SMP Poland sp. z.o.o., further amended its overdraft facility with HSBC Continental Europe (Spolka Akcyjna) Oddzial w Polsce. The overdraft facility, as amended, provides for borrowings under the facility in euros and U.S. dollars. Under the amended terms, the overdraft facility provides for borrowings of up to Polish zloty 30 million (approximately $7.5 million) if borrowings are solely in Polish zloty, or up to 85% of the Polish zloty 30 million limit (approximately $6.4 million) if borrowings are in euros and/or U.S. dollars. The overdraft facility had an original maturity date in March 2024, with automatic three-month renewals until June 2027, subject to cancellation by either party, at its sole discretion, at least 30 days prior to the commencement of the three-month renewal period. The facility automatically renewed in September 2024 to a December 2024 maturity date. Borrowings under the amended overdraft facility will bear interest at a rate equal to (1) the one month Warsaw Interbank Offered Rate (“WIBOR”) + 1.0% for borrowings in Polish zloty, (2) the one month Euro Interbank Offered Rate (“EURIBOR”) + 1.0% for borrowings in euros, and (3) the Mid-Point of the Fed Target Range + 1.25% for borrowings in U.S. dollars. Borrowings under the overdraft facility are guaranteed by Standard Motor Products, Inc., the ultimate parent company. There were $1.3 million in borrowings outstanding under the overdraft facility at September 30, 2024 and no borrowings outstanding at December 31, 2023. Maturities of Debt As of September 30, 2024, maturities of debt through 2029, assuming no prepayments, are as follows (in thousands): Revolving Polish Total Remainder of 2024 $ — $ 2,662 $ 2,662 2025 — 34 34 2026 — 47 47 2027 — 105 105 2028 — — — 2029 140,000 — 140,000 Total $ 140,000 $ 2,848 $ 142,848 Less: current maturities — (2,685) (2,685) Long-term debt $ 140,000 $ 163 $ 140,163 Deferred Financing Costs

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income Attributable to SMP	9 Months Ended
Accumulated Other Comprehensive Income Attributable to SMP	Sep. 30, 2024
Equity [Abstract]
Accumulated Other Comprehensive Income Attributable to SMP	Accumulated Other Comprehensive Income Attributable to SMP Changes in Accumulated Other Comprehensive Income by Component (in thousands) Three Months Ended September 30, 2024 Foreign Cash Flow Postretirement Total Balance at June 30, 2024 $ (13,850) $ 4,369 $ 19 $ (9,462) Other comprehensive income (loss) before reclassifications 2,443 (2,055) (a) — 388 Amounts reclassified from accumulated other comprehensive income — (497) (3) (500) Other comprehensive income (loss), net of tax 2,443 (2,552) (3) (112) Balance at September 30, 2024 $ (11,407) $ 1,817 $ 16 $ (9,574) Nine Months Ended September 30, 2024 Foreign Cash Flow Postretirement Total Balance at December 31, 2023 $ (8,897) $ 2,899 $ 24 $ (5,974) Other comprehensive income (loss) before reclassifications (2,510) 406 (a) — (2,104) Amounts reclassified from accumulated other comprehensive income — (1,488) (8) (1,496) Other comprehensive income (loss), net of tax (2,510) (1,082) (8) (3,600) Balance at September 30, 2024 $ (11,407) $ 1,817 $ 16 $ (9,574) (a) Consists of the unrecognized loss relating to the change in fair value of the cash flow interest rate hedge of $3.5 million ($2.6 million, net of tax) and $1.5 million ($1.1 million, net of tax) in the three and nine months ended September 30, 2024, respectively, and cash settlement receipts of $0.7 million ($0.5 million, net of tax) and $2.0 million (1.5 million, net of tax) in the three and nine months ended September 30, 2024, respectively. Reclassifications Out of Accumulated Other Comprehensive Income (in thousands) Three Months Nine Months Derivative cash flow hedge gain (a) $ (671) $ (2,010) Postretirement benefit plans unrecognized gain (b) (5) (14) Total before income tax (676) (2,024) Income tax expense (176) (528) Total reclassifications attributable to SMP $ (500) $ (1,496) (a) Unrecognized accumulated other comprehensive income (loss) related to the cash flow interest rate hedge is reclassified to earnings and reported as part of interest expense in our consolidated statements of operations when the interest payments on the underlying borrowings are recognized. (b) Unrecognized accumulated other comprehensive income (loss) related to our postretirement benefit plans is reclassified to earnings and included in the computation of net periodic postretirement benefit costs, which are included in other non-operating income, net in our consolidated statements of operations (see Note 12, “Employee Benefits,” for additional information).

Stock-Based Compensation Plans

Stock-Based Compensation Plans	9 Months Ended
Stock-Based Compensation Plans	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation Plans	Stock-Based Compensation Plans We account for our stock-based compensation plans in accordance with the provisions of FASB ASC 718, Stock Compensation , which requires that a company measure the cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award. The cost is recognized in the consolidated statement of operations over the period during which an employee is required to provide service in exchange for the award. Restricted and Performance Stock Grants We are authorized to issue, among other things, shares of restricted and performance-based stock to eligible employees and restricted stock to directors of up to 2,050,000 shares under the Amended and Restated 2016 Omnibus Incentive Plan (“Plan”). Shares issued under the Plan that are cancelled, forfeited or expire by their terms are eligible to be granted again under the Plan. As part of the Plan, we currently grant shares of restricted stock to eligible employees and our independent directors and performance-based shares to eligible employees. We grant eligible employees two types of restricted stock (standard restricted shares and long-term retention restricted shares). Standard restricted shares granted to employees become fully vested no earlier than three years after the date of grant. Long-term retention restricted shares granted to selected executives vest at a 25% rate on or within approximately two months of an executive reaching the ages 60 and 63, and become fully vested on or within approximately two months of an executive reaching the age 65. Restricted shares granted to directors become fully vested upon the first anniversary of the date of grant. Performance-based shares issued to eligible employees are subject to a three-year measuring period and the achievement of performance targets and, depending upon the achievement of such performance targets, they may become vested no earlier than three years after the date of grant. Each period we evaluate the probability of achieving the applicable targets, and we adjust our accrual accordingly. Restricted shares (other than long-term retention restricted shares) and performance shares issued to certain key executives and directors are subject to a one Our restricted and performance-based share activity was as follows for the nine months ended September 30, 2024: Shares Weighted Average Balance at December 31, 2023 880,976 $ 29.48 Granted 6,775 27.64 Vested (44,121) 29.75 Forfeited (32,050) 29.95 Balance at September 30, 2024 811,580 $ 29.43

Employee Benefits

Employee Benefits	9 Months Ended
Employee Benefits	Sep. 30, 2024
Retirement Benefits [Abstract]
Employee Benefits	Employee Benefits We provide certain medical and dental care benefits to 13 former U.S. union employees. The postretirement medical and dental benefit obligation to the former union employees as of September 30, 2024, and the related net periodic benefit cost for the plan for the three and nine months ended September 30, 2024 and 2023 were not material. We maintain a defined contribution Supplemental Executive Retirement Plan for key employees. Under the plan, these employees may elect to defer a portion of their compensation and, in addition, we may at our discretion make contributions to the plan on behalf of the employees. In March 2024, we made company contributions to the plan of $0.5 million related to calendar year 2023. We also have an Employee Stock Ownership Plan and Trust for employees who are not covered by a collective bargaining agreement. In connection therewith, we maintain an employee benefits trust to which we contribute shares of treasury stock. We are authorized to instruct the trustees to distribute such shares toward the satisfaction of our future obligations under the plan. The shares held in trust are not considered outstanding for purposes of calculating earnings per share until they are committed to be released. The trustees will vote the shares in accordance with their fiduciary duties. During the nine months ended September 30, 2024, we contributed to the trust an additional 68,700 shares from our treasury and released 68,700 shares from the trust leaving 200 shares remaining in the trust as of September 30, 2024.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
Derivative Financial Instruments	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments We occasionally use derivative financial instruments, including interest rate swaps and forward foreign exchange contracts, to reduce our market risk for changes in interest rates on our variable rate borrowings and to manage foreign exchange rate risk on certain transactions. The interest rate swaps effectively convert a portion of our variable rate borrowings under our existing facilities to a fixed rate based upon determined notional amount. The forward foreign exchange contracts fix expected future cash flows in U.S. dollar terms. We do not enter into derivative financial instruments, for trading or speculative purposes. In June 2022, we entered into a seven year interest rate swap agreement with a notional amount of $100 million that is to mature in May 2029. The interest rate swap agreement has been designated as a cash flow hedge of interest payments on $100 million of borrowings under our 2024 Credit Agreement. Under the terms of the swap agreement, we will receive monthly variable interest payments based on one month Term SOFR and will pay interest based upon a fixed rate of 2.683% per annum. The fair value of the interest rate swap agreement as of September 30, 2024 and December 31, 2023 was an asset of $2.5 million and $3.9 million, respectively, which has been deferred and recorded in accumulated other comprehensive income, net of income taxes, in our consolidated balance sheet. When the interest expense on the underlying borrowing is recognized, the deferred gain/loss in accumulated other comprehensive income is recorded in earnings as interest expense in the consolidated statements of operations. We perform quarterly hedge effectiveness assessments, and anticipate that the interest rate swap will be highly effective throughout its term.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
Fair Value Measurements	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements We follow a three-level fair value hierarchy that prioritizes the inputs to measure fair value. This hierarchy requires entities to maximize the use of “observable inputs” and minimize the use of “unobservable inputs.” The three levels of inputs used to measure fair value are as follows: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect assumptions that market participants would use in pricing an asset or liability. The following is a summary of the estimated fair values, carrying amounts, and classification under the fair value hierarchy of our financial instruments at September 30, 2024 and December 31, 2023 (in thousands): September 30, 2024 December 31, 2023 Fair Value Fair Value Carrying Fair Value Carrying Cash and cash equivalents (a) 1, 2 $ 26,348 $ 26,348 $ 32,526 $ 32,526 Deferred compensation 1 26,855 26,855 23,893 23,893 Short term borrowings 2 2,685 2,685 5,029 5,029 Long-term debt 2 140,163 140,163 151,182 151,182 Cash flow hedge interest rate swap 2 2,462 2,462 3,939 3,939 Short-term investments 2 7,050 7,050 — — Long-term investments 2 598 598 7,468 7,468 Forward foreign exchange contracts 2 995 995 — — (a) As of September 30, 2024 cash and cash equivalents consist solely of cash of $26.3 million, which is classified as Level 1 under the fair value hierarchy. As of December 31, 2023 cash and cash equivalents consist of cash of $29.5 million and cash equivalents of $3 million, which are classified as Level 1 and Level 2, respectively, under the fair value hierarchy. Cash equivalents consist of certificates of deposit with original maturities of three months, or less. These securities are accounted for as held-to-maturity and recorded at amortized cost, which approximates their fair values. The fair value of the underlying assets held by the deferred compensation plan are based on the quoted market prices of the underlying funds which are held by registered investment companies. The carrying value of our variable rate short-term borrowings and long-term debt under our credit facilities approximates fair value as the variable interest rates in the facilities reflect current market rates. The fair value of our cash flow interest rate swap agreement is obtained from an independent third party, is based upon market quotes, and represents the net amount required to terminate the interest rate swap, taking into consideration market rates and counterparty credit risk. The fair value of our forward foreign exchange contracts is based on observable market transactions of spot and forward rates. Short-term and long-term investments consist of certificates of deposit with original maturities occurring within the next twelve months or in excess of twelve months, respectively. These certificates of deposit are securities accounted for as held-to-maturity and recorded at amortized cost, which approximates their fair values at September 30, 2024.

Earnings Per Share

Earnings Per Share	9 Months Ended
Earnings Per Share	Sep. 30, 2024
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following are reconciliations of the net earnings attributable to SMP and the shares used in calculating basic and dilutive net earnings per common share attributable to SMP (in thousands, except per share data): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Net earnings (loss) attributable to SMP Continuing operations $ 26,581 $ 24,859 $ 54,424 $ 55,915 Discontinued operations (22,771) (18,200) (24,727) (28,201) Net earnings attributable to SMP $ 3,810 $ 6,659 $ 29,697 $ 27,714 Basic net earnings (loss) per common share attributable to SMP Continuing operations $ 1.22 $ 1.14 $ 2.50 $ 2.58 Discontinued operations $ (1.04) $ (0.83) $ (1.14) $ (1.30) Diluted net earnings (loss) per common share attributable to SMP Continuing operations $ 1.20 $ 1.12 $ 2.45 $ 2.52 Discontinued operations $ (1.03) $ (0.82) $ (1.11) $ (1.27) Weighted average common shares outstanding, basic 21,716 21,727 21,802 21,676 Dilutive effect of restricted stock and performance-based stock 438 527 423 522 Weighted average common shares outstanding, diluted 22,154 22,254 22,225 22,198 The shares listed below were not included in the computation of diluted net earnings per common share attributable to SMP because to do so would have been anti-dilutive for the periods presented or because they were excluded under the treasury method (in thousands): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Restricted and performance-based shares 250 242 274 273

Industry Segments

Industry Segments	9 Months Ended
Industry Segments	Sep. 30, 2024
Segment Reporting [Abstract]
Industry Segments	Industry Segments Our business is organized into three operating segments, Vehicle Control, Temperature Control and Engineered Solutions, each of which focuses on a specific line of business. Our automotive aftermarket business is comprised of two operating segments, Vehicle Control and Temperature Control, while our Engineered Solutions operating segment offers a broad array of conventional and future-oriented technologies. The following tables show our net sales and operating income for each reportable operating segment (in thousands): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Net Sales (a) Vehicle Control $ 200,877 $ 190,937 $ 575,142 $ 559,303 Temperature Control 125,985 123,643 322,074 293,123 Engineered Solutions 72,403 71,833 223,281 215,090 Other — — — — Consolidated $ 399,265 $ 386,413 $ 1,120,497 $ 1,067,516 Operating Income Vehicle Control $ 21,029 $ 18,071 $ 51,685 $ 54,719 Temperature Control 16,074 13,054 31,302 20,938 Engineered Solutions 5,010 7,254 13,054 19,064 Other (4,974) (3,573) (19,297) (11,991) Consolidated $ 37,139 $ 34,806 $ 76,744 $ 82,730 (a) There are no intersegment sales among our Vehicle Control, Temperature Control and Engineered Solutions operating segments.

Net Sales

Net Sales	9 Months Ended
Net Sales	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Net Sales	Net Sales Disaggregation of Net Sales We disaggregate our net sales from contracts with customers by major product group and geographic area within each of our segments, as we believe it best depicts how the nature, amount, timing and uncertainty of our net sales are affected by economic factors. Major Product Group The Vehicle Control operating segment generates its revenues from core automotive aftermarket sales of ignition, emissions, and fuel delivery, electrical and safety, and wire sets and other product categories. The Temperature Control operating segment generates its revenue from core automotive aftermarket sales of air conditioning system components and other thermal products. The Engineered Solutions operating segment generates revenues from custom-engineered products to vehicle and equipment manufacturers in highly diversified global end-markets such as commercial and light vehicles, construction, agriculture, power sports and marine. The following table summarizes consolidated net sales by major product group within each operating segment for the three and nine months ended September 30, 2024 and 2023 (in thousands): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Vehicle Control Engine Management (Ignition, Emissions and Fuel Delivery) $ 121,432 $ 113,188 $ 353,046 $ 342,860 Electrical and Safety 63,237 62,049 172,772 166,720 Wire Sets and Other 16,208 15,700 49,324 49,723 Total Vehicle Control 200,877 190,937 575,142 559,303 Temperature Control AC System Components 95,698 94,385 245,628 217,913 Other Thermal Components 30,287 29,258 76,446 75,210 Total Temperature Control 125,985 123,643 322,074 293,123 Engineered Solutions Commercial Vehicle 22,625 18,701 69,016 59,158 Construction/Agriculture 8,082 9,974 27,631 32,804 Light Vehicle 24,287 24,123 70,776 71,123 All Other 17,409 19,035 55,858 52,005 Total Engineered Solutions 72,403 71,833 223,281 215,090 Other — — — — Total $ 399,265 $ 386,413 $ 1,120,497 $ 1,067,516 Geographic Area We sell our line of products primarily in the United States, with additional sales in Canada, Mexico, Europe, Asia and Latin America. Sales are attributed to countries based upon the location of the customer. Our sales are substantially denominated in U.S. dollars. The following tables provide disaggregation of net sales information by geographic area within each operating segment for the three and nine months ended September 30, 2024 and 2023 (in thousands): Three months ended September 30, 2024 Vehicle Temperature Engineered Other Total United States $ 180,071 $ 118,469 $ 40,629 $ — $ 339,169 Canada 9,413 6,998 8,218 — 24,629 Europe 234 102 11,409 — 11,745 Mexico 9,614 33 2,392 — 12,039 Asia 117 350 9,010 — 9,477 Other foreign 1,428 33 745 — 2,206 Total $ 200,877 $ 125,985 $ 72,403 $ — $ 399,265 Three months ended September 30, 2023 Vehicle Temperature Engineered Other Total United States $ 171,188 $ 116,684 $ 41,835 $ — $ 329,707 Canada 9,440 6,501 8,586 — 24,527 Europe 174 — 14,971 — 15,145 Mexico 8,968 29 1,311 — 10,308 Asia 132 367 4,416 — 4,915 Other foreign 1,035 62 714 — 1,811 Total $ 190,937 $ 123,643 $ 71,833 $ — $ 386,413 Nine months ended September 30, 2024 Vehicle Temperature Engineered Other Total United States $ 512,791 $ 300,766 $ 122,032 $ — $ 935,589 Canada 27,252 20,215 24,897 — 72,364 Europe 778 153 39,493 — 40,424 Mexico 30,429 42 7,322 — 37,793 Asia 245 645 27,215 — 28,105 Other foreign 3,647 253 2,322 — 6,222 Total $ 575,142 $ 322,074 $ 223,281 $ — $ 1,120,497 Nine months ended September 30, 2023 Vehicle Temperature Engineered Other Total United States $ 502,798 $ 278,354 $ 130,606 $ — $ 911,758 Canada 26,604 14,182 19,950 — 60,736 Europe 620 — 44,969 — 45,589 Mexico 25,734 47 5,117 — 30,898 Asia 282 387 12,743 — 13,412 Other foreign 3,265 153 1,705 — 5,123 Total $ 559,303 $ 293,123 $ 215,090 $ — $ 1,067,516

Commitment and Contingencies

Commitment and Contingencies	9 Months Ended
Commitment and Contingencies	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Asbestos In 1986, we acquired a brake business, which we subsequently sold in March 1998 and which is accounted for as a discontinued operation in the accompanying statement of operations. When we originally acquired this brake business, we assumed future liabilities relating to any alleged exposure to asbestos-containing products manufactured by the seller of the acquired brake business. In accordance with the related purchase agreement, we agreed to assume the liabilities for all new claims filed on or after September 2001. Our ultimate exposure will depend upon the number of claims filed against us on or after September 2001, and the amounts paid for settlements, awards of asbestos-related damages, and defense of such claims. At September 30, 2024, approximately 1,302 cases were outstanding for which we may be responsible for any related liabilities. Since inception in September 2001 through September 30, 2024, the amounts paid for settled claims and awards of asbestos-related damages, including interest, were approximately $86.4 million. We do not have insurance coverage for the indemnity and defense costs associated with the claims we face. In evaluating our potential asbestos-related liability, we have considered various factors including, among other things, an actuarial study of the asbestos related liabilities performed by an independent actuarial firm, our settlement amounts and whether there are any co-defendants, the jurisdiction in which lawsuits are filed, and the status and results of such claims. As is our accounting policy, we consider the advice of actuarial consultants with experience in assessing asbestos-related liabilities to estimate our potential claim liability; and perform an actuarial evaluation in the third quarter of each year and whenever events or changes in circumstances indicate that additional provisions may be necessary. The methodology used to project asbestos-related liabilities and costs in our actuarial study considered: (1) historical data available from publicly available studies; (2) an analysis of our recent claims history to estimate likely filing rates into the future; (3) an analysis of our pending claims; (4) an analysis of our settlements and awards of asbestos-related damages to date; and (5) an analysis of closed claims with pay ratios and lag patterns in order to develop average future settlement values. Based on the information contained in the actuarial study and all other available information considered by us, we have concluded that no amount within the range of settlement payments and awards of asbestos-related damages was more likely than any other and, therefore, in assessing our asbestos liability we compare the low end of the range to our recorded liability to determine if an adjustment is required. In accordance with our policy to perform an annual actuarial evaluation in the third quarter of each year, an actuarial study was performed as of August 31, 2024. The results of the August 31, 2024 study included an estimate of our undiscounted liability for settlement payments and awards of asbestos-related damages, excluding legal costs, ranging from $99.6 million to $210.8 million for the period through 2065. The change from the prior year study, which was as of August 31, 2023, was a $15.6 million increase for the low end of the range and a $75.5 million increase for the high end of the range. The increase in the estimated undiscounted liability from the prior year study at both the low end and high end of the range reflects our actual experience, our historical data and certain assumptions with respect to events that may occur in the future. Based upon the results of the August 31, 2024 actuarial study, in September 2024 we increased our asbestos liability to $99.6 million, the low end of the range, and recorded an incremental pre-tax provision of $29.3 million in loss from discontinued operations in the accompanying consolidated statement of operations. Future legal costs, which are expensed as incurred and reported in loss from discontinued operations in the accompanying consolidated statement of operations, are estimated, according to the August 31, 2024 study, to range from $49.8 million to $115.9 million for the period through 2065. Total operating cash outflows related to discontinued operations, which include settlements, awards of asbestos-related damages and legal costs, net of taxes, were $10.3 million and $8.7 million for the nine months ended September 30, 2024 and 2023, respectively. We plan to perform an annual actuarial evaluation during the third quarter of each year for the foreseeable future and whenever events or changes in circumstances indicate that additional provisions may be necessary. Given the uncertainties associated with projecting such matters into the future and other factors outside our control, we can give no assurance that additional provisions will not be required. We will continue to monitor events and changes in circumstances surrounding these potential liabilities in determining whether to perform additional actuarial evaluations and whether additional provisions may be necessary. At the present time, however, we do not believe that any additional provisions would be reasonably likely to have a material adverse effect on our liquidity or consolidated financial position. Other Litigation We are currently involved in various other legal claims and legal proceedings (some of which may involve substantial amounts), including claims related to commercial disputes, product liability, employment, and environmental. Although these legal claims and legal proceedings are subject to inherent uncertainties, based on our understanding and evaluation of the relevant facts and circumstances, we believe that the ultimate outcome of these matters will not, either individually or in the aggregate, have a material adverse effect on our business, financial condition or results of operations. We may at any time determine that settling any of these matters is in our best interests, which settlement may include substantial payments. Although we cannot currently predict the specific amount of any liability that may ultimately arise with respect to any of these matters, we will record provisions when the liability is considered probable and reasonably estimable. Significant judgment is required in both the determination of probability and the determination as to whether an exposure can be reasonably estimated. As additional information becomes available, we reassess our potential liability related to these matters. Such revisions of the potential liabilities could have a material adverse effect on our business, financial condition or results of operations. Warranties We generally warrant our products against certain manufacturing and other defects. These product warranties are provided for specific periods of time of the product depending on the nature of the product. The accrued product warranty costs are based primarily on historical experience of actual warranty claims and included in accrued customer returns. The following table provides the changes in our product warranties (in thousands): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Balance, beginning of period $ 27,543 $ 23,586 $ 21,134 $ 19,667 Liabilities accrued for current year sales 39,246 36,844 104,926 92,684 Settlements of warranty claims (35,060) (36,905) (94,331) (88,826) Balance, end of period $ 31,729 $ 23,525 $ 31,729 $ 23,525

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2024
Accounting Policies [Abstract]
Principles of Consolidation	The accompanying unaudited financial information should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2023. The unaudited consolidated financial statements include our accounts and all domestic and international companies in which we have more than a 50% equity ownership, except in instances where the minority shareholder maintains substantive participating rights, in which case we follow the equity method of accounting. In instances where we have more than a 50% equity ownership and the minority shareholder does not maintain substantive participating rights, our consolidated financial statements include the accounts of the company on a consolidated basis with its net income and equity reported at amounts attributable to both our equity position and that of the noncontrolling interest. Investments in unconsolidated affiliates are accounted for on the equity method, as we do not have a controlling financial interest but have the ability to exercise significant influence. All significant inter-company items have been eliminated.
Basis of Accounting	The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. The results of operations for the interim periods are not necessarily indicative of the results of operations for the entire year.
Reclassification	Reclassification Certain prior period amounts in the accompanying consolidated financial statements and related notes have been reclassified to conform to the 2024 presentation.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements Standards not yet adopted as of September 30, 2024 Standard Description Effective date Effects on the financial statements or other significant matters ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures ASU 2023-07 will improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses on an interim and annual basis. ASU 2023-07 expands segment disclosures by requiring disclosure of (1) significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit or loss; (2) the amount and description of the composition of other segment items to reconcile to segment profit and loss; and (3) the CODM’s title and position and how the CODM uses the reported segment measures to allocate resources. Additionally, ASU 2023-07 requires interim disclosures of all reportable segment profit or loss and assets previously required annually by Topic 280. The ASU is effective for the fiscal years beginning after December 15, 2023, which for us is December 31, 2024, and all subsequent interim periods, with full retrospective application required to all prior periods presented. Early adoption is permitted. The new standard will require expanding our segment disclosure to include additional segment level information. We are currently evaluating the full impact of adopting ASU 2023-07 on our consolidated financial statements, disclosures, processes and controls. On an ongoing basis, we will continue to assess the impact of the new standard through our planned date of adoption of December 31, 2024. ASU 2023-09, Income Taxes (Topic 270): Improvements to Income Tax Disclosures ASU 2023-09 will improve transparency and decision making usefulness of income tax disclosures. ASU 2023-09 will expand the annual required effective income tax rate reconciliation disclosures to include (1) eight specific categories of rate reconciling items; (2) additional information for reconciling items that meet or exceed a quantitative threshold; and (3) expand the required disclosures to include reconciling percentages as well as reported amounts. Additionally, ASU 2023-09 will expand required annual disclosures of income taxes paid to include the disaggregation by federal, state and foreign jurisdictions. The ASU is effective for annual reporting periods beginning after December 15, 2024, which for us is December 31, 2025, with prospective application. Early adoption and retrospective application are permitted. The new standard will require expanding our annual income tax disclosures in our financial statements. We are currently evaluating the full impact of adopting ASU 2023-09 on our consolidated financial statements, disclosures, processes and controls. On an ongoing basis, we will continue to assess the impact of the new standard through our planned date of adoption of December 31, 2025. We have reviewed all other recently issued accounting pronouncements and concluded they were either not applicable or not expected to have a material impact on the Company’s consolidated financial statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	9 Months Ended
Summary of Significant Accounting Policies (Tables)	Sep. 30, 2024
Accounting Policies [Abstract]
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements Standards not yet adopted as of September 30, 2024 Standard Description Effective date Effects on the financial statements or other significant matters ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures ASU 2023-07 will improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses on an interim and annual basis. ASU 2023-07 expands segment disclosures by requiring disclosure of (1) significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit or loss; (2) the amount and description of the composition of other segment items to reconcile to segment profit and loss; and (3) the CODM’s title and position and how the CODM uses the reported segment measures to allocate resources. Additionally, ASU 2023-07 requires interim disclosures of all reportable segment profit or loss and assets previously required annually by Topic 280. The ASU is effective for the fiscal years beginning after December 15, 2023, which for us is December 31, 2024, and all subsequent interim periods, with full retrospective application required to all prior periods presented. Early adoption is permitted. The new standard will require expanding our segment disclosure to include additional segment level information. We are currently evaluating the full impact of adopting ASU 2023-07 on our consolidated financial statements, disclosures, processes and controls. On an ongoing basis, we will continue to assess the impact of the new standard through our planned date of adoption of December 31, 2024. ASU 2023-09, Income Taxes (Topic 270): Improvements to Income Tax Disclosures ASU 2023-09 will improve transparency and decision making usefulness of income tax disclosures. ASU 2023-09 will expand the annual required effective income tax rate reconciliation disclosures to include (1) eight specific categories of rate reconciling items; (2) additional information for reconciling items that meet or exceed a quantitative threshold; and (3) expand the required disclosures to include reconciling percentages as well as reported amounts. Additionally, ASU 2023-09 will expand required annual disclosures of income taxes paid to include the disaggregation by federal, state and foreign jurisdictions. The ASU is effective for annual reporting periods beginning after December 15, 2024, which for us is December 31, 2025, with prospective application. Early adoption and retrospective application are permitted. The new standard will require expanding our annual income tax disclosures in our financial statements. We are currently evaluating the full impact of adopting ASU 2023-09 on our consolidated financial statements, disclosures, processes and controls. On an ongoing basis, we will continue to assess the impact of the new standard through our planned date of adoption of December 31, 2025. We have reviewed all other recently issued accounting pronouncements and concluded they were either not applicable or not expected to have a material impact on the Company’s consolidated financial statements.

Business Acquisitions and Inv_2

Business Acquisitions and Investments (Tables)	9 Months Ended
Business Acquisitions and Investments (Tables)	Sep. 30, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the allocation of the total step acquisition purchase consideration to the identifiable assets acquired and liabilities assumed based on their fair values (in thousands): Total purchase consideration (a) $ 21,725 Assets acquired and liabilities assumed: Cash and cash equivalents $ 6,779 Receivables 5,912 Inventory 5,945 Other current assets 528 Property, plant and equipment, net 2,924 Operating lease right-of-use assets 4,372 Intangible assets (b) 532 Goodwill 2,208 Long term investments and other assets 7,257 Current liabilities (6,004) Noncurrent operating lease liabilities (3,455) Subtotal 26,998 Fair value of acquired noncontrolling interest (5,273) Total purchase consideration allocated to net assets acquired $ 21,725 (a) Total purchase consideration is the sum of the fair value of the previously held equity investment interest in Gwo Yng of $17.7 million and the cash paid of $4 million for the acquisition of the additional 15% equity ownership interest. (b) Intangible assets consists of customer relationships of $0.4 million and capitalized software of $0.1 million.

Restructuring and Integration_2

Restructuring and Integration Expenses (Tables)	9 Months Ended
Restructuring and Integration Expenses (Tables)	Sep. 30, 2024
Restructuring and Related Activities [Abstract]
Schedule of Related to the Separation Program Workforce Reduction	Activity for the nine months ended September 30, 2024 related to the separation program workforce reduction consisted of the following (in thousands): Exit activity liability at December 31, 2023 $ — Restructuring and integration costs: Amounts provided for during 2024 (a) 5,602 Stock-based compensation 150 Cash payments (959) Foreign currency exchange rate changes 1 Exit activity liability at September 30, 2024 $ 4,794 (a) Restructuring and integration expenses incurred during the nine months ended September 30, 2024 consist of $2.7 million in our Vehicle Control segment, $0.6 million in our Temperature Control segment, $0.6 million in our Engineered Solutions segment and $1.7 million in our Other segment. Workforce Other Exit Total Exit activity liability at December 31, 2023 $ 1,729 $ — $ 1,729 Restructuring and integration costs: Amounts provided for during 2024 (a) (45) 217 172 Cash payments (1,315) (217) (1,532) Foreign currency exchange rate changes (22) — (22) Exit activity liability at September 30, 2024 $ 347 $ — $ 347 (a) Restructuring and integration expenses incurred during the nine months ended September 30, 2024 consist of $61 thousand in our Vehicle Control segment, $59 thousand in our Temperature Control segment and $52 thousand in our Engineered Solutions segment.

Inventories (Tables)

Inventories (Tables)	9 Months Ended
Inventories (Tables)	Sep. 30, 2024
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories, which are stated at the lower of cost (determined by means of the first-in, first-out method) and net realizable value, consist of the following, in thousands: September 30, December 31, Finished goods $ 294,153 $ 302,557 Work in process 18,406 18,503 Raw materials 190,456 186,015 Subtotal 503,015 507,075 Unreturned customer inventories 17,843 18,240 Total inventories $ 520,858 $ 525,315

Acquired Intangible Assets (Tab

Acquired Intangible Assets (Tables)	9 Months Ended
Acquired Intangible Assets (Tables)	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination	Acquired identifiable intangible assets consist of the following, in thousands: September 30, December 31, Customer relationships $ 159,934 $ 159,641 Patents, developed technology and intellectual property 14,123 14,123 Trademarks and trade names 8,880 8,880 Non-compete agreements 3,308 3,295 Supply agreements 800 800 Leaseholds 160 160 Total acquired intangible assets 187,205 186,899 Less: Accumulated amortization (a) (102,379) (95,681) Net acquired intangible assets $ 84,826 $ 91,218 (a) Applies to all intangible assets, except for trademarks and trade names totaling $2.6 million, which have indefinite useful lives and, as such, are not being amortized.

Leases (Tables)

Leases (Tables)	9 Months Ended
Leases (Tables)	Sep. 30, 2024
Leases [Abstract]
Schedule of Lessee Quantitative Disclosures Related To Operating Leases	The following tables provide quantitative disclosures related to our operating leases and include all operating leases acquired from the date of acquisition (in thousands, except where otherwise indicated): Balance Sheet Information September 30, December 31, Assets Operating lease right-of-use assets $ 96,039 $ 100,065 Liabilities Sundry payables and accrued expenses $ 16,848 $ 17,139 Noncurrent operating lease liabilities 86,259 88,974 Total operating lease liabilities $ 103,107 $ 106,113 Weighted Average Remaining Lease Term 7.9 Years 8.3 Years Weighted Average Discount Rate 4.9 % 4.8 %
Schedule of Components of Lease Expense and Supplemental Cash Flow Information	Three Months Ended Nine Months Ended Lease Expense 2024 2023 2024 2023 Lease expense $ 4,548 $ 4,762 $ 14,220 $ 11,647 Variable and other lease expense (a) 1,545 1,354 2,953 2,637 Total lease costs $ 6,093 $ 6,116 $ 17,173 $ 14,284 (a) Variable and other lease expense relate to non-lease components such as maintenance, property taxes, etc., and operating lease expense for leases with an initial term of 12 months or less which are not material. Nine Months Ended 2024 2023 Supplemental Cash Flow Information Cash paid for the amounts included in the measurement of lease liabilities $ 13,253 $ 8,212 Right-of-use assets obtained in exchange for new lease obligations (a) $ 6,902 $ 61,929 (a) Includes $4.7 million of right-of-use assets related to the lease modification and extension for our manufacturing facility in Bialystok, Poland during the nine months ended September 30, 2024 and $27.8 million of right-of-use assets related to the lease modification and extension for our distribution center and office in Lewisville, Texas; $26.1 million of right-of-use assets related to the new distribution center in Shawnee, Kansas; and $4.4 million of right-of-use assets obtained in Gwo Yng step-acquisition during the nine months ended September 30, 2023.
Schedule of Lessee, Operating Lease, Liability, to be Paid, Maturity	At September 30, 2024, we are obligated to make minimum lease payments through 2034, under operating leases, which are as follows: 2024 $ 4,711 2025 17,058 2026 15,711 2027 14,417 2028 12,647 Thereafter 62,118 Total lease payments $ 126,662 Less: Interest (23,555) Present value of lease liabilities $ 103,107

Credit Facilities and Long-Te_2

Credit Facilities and Long-Term Debt (Tables)	9 Months Ended
Credit Facilities and Long-Term Debt (Tables)	Sep. 30, 2024
Debt Disclosure [Abstract]
Schedule of Debt	Total debt outstanding is summarized as follows, in thousands: September 30, December 31, Credit facility – term loan due 2027 $ — $ 92,500 Credit facility – revolver due 2027 — 63,500 Credit facility – revolver due 2029 140,000 — Other 2,848 211 Total debt $ 142,848 $ 156,211 Current maturities of debt $ 2,685 $ 5,029 Long-term debt 140,163 151,182 Total debt $ 142,848 $ 156,211
Schedule of Maturities of Long-Term Debt	As of September 30, 2024, maturities of debt through 2029, assuming no prepayments, are as follows (in thousands): Revolving Polish Total Remainder of 2024 $ — $ 2,662 $ 2,662 2025 — 34 34 2026 — 47 47 2027 — 105 105 2028 — — — 2029 140,000 — 140,000 Total $ 140,000 $ 2,848 $ 142,848 Less: current maturities — (2,685) (2,685) Long-term debt $ 140,000 $ 163 $ 140,163

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income Attributable to SMP (Tables)	9 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Schedule of Accumulated Other Comprehensive by Component	Changes in Accumulated Other Comprehensive Income by Component (in thousands) Three Months Ended September 30, 2024 Foreign Cash Flow Postretirement Total Balance at June 30, 2024 $ (13,850) $ 4,369 $ 19 $ (9,462) Other comprehensive income (loss) before reclassifications 2,443 (2,055) (a) — 388 Amounts reclassified from accumulated other comprehensive income — (497) (3) (500) Other comprehensive income (loss), net of tax 2,443 (2,552) (3) (112) Balance at September 30, 2024 $ (11,407) $ 1,817 $ 16 $ (9,574) Nine Months Ended September 30, 2024 Foreign Cash Flow Postretirement Total Balance at December 31, 2023 $ (8,897) $ 2,899 $ 24 $ (5,974) Other comprehensive income (loss) before reclassifications (2,510) 406 (a) — (2,104) Amounts reclassified from accumulated other comprehensive income — (1,488) (8) (1,496) Other comprehensive income (loss), net of tax (2,510) (1,082) (8) (3,600) Balance at September 30, 2024 $ (11,407) $ 1,817 $ 16 $ (9,574) (a) Consists of the unrecognized loss relating to the change in fair value of the cash flow interest rate hedge of $3.5 million ($2.6 million, net of tax) and $1.5 million ($1.1 million, net of tax) in the three and nine months ended September 30, 2024, respectively, and cash settlement receipts of $0.7 million ($0.5 million, net of tax) and $2.0 million (1.5 million, net of tax) in the three and nine months ended September 30, 2024, respectively.
Schedule of Reclassification Out of Accumulated Other Comprehensive Income	Reclassifications Out of Accumulated Other Comprehensive Income (in thousands) Three Months Nine Months Derivative cash flow hedge gain (a) $ (671) $ (2,010) Postretirement benefit plans unrecognized gain (b) (5) (14) Total before income tax (676) (2,024) Income tax expense (176) (528) Total reclassifications attributable to SMP $ (500) $ (1,496) (a) Unrecognized accumulated other comprehensive income (loss) related to the cash flow interest rate hedge is reclassified to earnings and reported as part of interest expense in our consolidated statements of operations when the interest payments on the underlying borrowings are recognized. (b) Unrecognized accumulated other comprehensive income (loss) related to our postretirement benefit plans is reclassified to earnings and included in the computation of net periodic postretirement benefit costs, which are included in other non-operating income, net in our consolidated statements of operations (see Note 12, “Employee Benefits,” for additional information).

Stock-Based Compensation Plans

Stock-Based Compensation Plans (Tables)	9 Months Ended
Stock-Based Compensation Plans (Tables)	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Share-Based Payment Arrangement, Restricted Stock and Performance-Based Share Activity	Our restricted and performance-based share activity was as follows for the nine months ended September 30, 2024: Shares Weighted Average Balance at December 31, 2023 880,976 $ 29.48 Granted 6,775 27.64 Vested (44,121) 29.75 Forfeited (32,050) 29.95 Balance at September 30, 2024 811,580 $ 29.43

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
Fair Value Measurements (Tables)	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Schedule of Estimated Fair Values, Carrying Amounts and Classification under Fair Value Hierarchy	The following is a summary of the estimated fair values, carrying amounts, and classification under the fair value hierarchy of our financial instruments at September 30, 2024 and December 31, 2023 (in thousands): September 30, 2024 December 31, 2023 Fair Value Fair Value Carrying Fair Value Carrying Cash and cash equivalents (a) 1, 2 $ 26,348 $ 26,348 $ 32,526 $ 32,526 Deferred compensation 1 26,855 26,855 23,893 23,893 Short term borrowings 2 2,685 2,685 5,029 5,029 Long-term debt 2 140,163 140,163 151,182 151,182 Cash flow hedge interest rate swap 2 2,462 2,462 3,939 3,939 Short-term investments 2 7,050 7,050 — — Long-term investments 2 598 598 7,468 7,468 Forward foreign exchange contracts 2 995 995 — — (a)

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
Earnings Per Share (Tables)	Sep. 30, 2024
Earnings Per Share [Abstract]
Schedule of Reconciliations of Earnings Available to Common Stockholders and Shares used in Calculating Basic and Dilutive Net Earnings per Common Share	The following are reconciliations of the net earnings attributable to SMP and the shares used in calculating basic and dilutive net earnings per common share attributable to SMP (in thousands, except per share data): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Net earnings (loss) attributable to SMP Continuing operations $ 26,581 $ 24,859 $ 54,424 $ 55,915 Discontinued operations (22,771) (18,200) (24,727) (28,201) Net earnings attributable to SMP $ 3,810 $ 6,659 $ 29,697 $ 27,714 Basic net earnings (loss) per common share attributable to SMP Continuing operations $ 1.22 $ 1.14 $ 2.50 $ 2.58 Discontinued operations $ (1.04) $ (0.83) $ (1.14) $ (1.30) Diluted net earnings (loss) per common share attributable to SMP Continuing operations $ 1.20 $ 1.12 $ 2.45 $ 2.52 Discontinued operations $ (1.03) $ (0.82) $ (1.11) $ (1.27) Weighted average common shares outstanding, basic 21,716 21,727 21,802 21,676 Dilutive effect of restricted stock and performance-based stock 438 527 423 522 Weighted average common shares outstanding, diluted 22,154 22,254 22,225 22,198
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The shares listed below were not included in the computation of diluted net earnings per common share attributable to SMP because to do so would have been anti-dilutive for the periods presented or because they were excluded under the treasury method (in thousands): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Restricted and performance-based shares 250 242 274 273

Industry Segments (Tables)

Industry Segments (Tables)	9 Months Ended
Industry Segments (Tables)	Sep. 30, 2024
Segment Reporting [Abstract]
Schedule of Net Sales and Operating Income for Each Reportable Operating Segment	The following tables show our net sales and operating income for each reportable operating segment (in thousands): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Net Sales (a) Vehicle Control $ 200,877 $ 190,937 $ 575,142 $ 559,303 Temperature Control 125,985 123,643 322,074 293,123 Engineered Solutions 72,403 71,833 223,281 215,090 Other — — — — Consolidated $ 399,265 $ 386,413 $ 1,120,497 $ 1,067,516 Operating Income Vehicle Control $ 21,029 $ 18,071 $ 51,685 $ 54,719 Temperature Control 16,074 13,054 31,302 20,938 Engineered Solutions 5,010 7,254 13,054 19,064 Other (4,974) (3,573) (19,297) (11,991) Consolidated $ 37,139 $ 34,806 $ 76,744 $ 82,730 (a) There are no intersegment sales among our Vehicle Control, Temperature Control and Engineered Solutions operating segments.

Net Sales (Tables)

Net Sales (Tables)	9 Months Ended
Net Sales (Tables)	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Net Sales	The following table summarizes consolidated net sales by major product group within each operating segment for the three and nine months ended September 30, 2024 and 2023 (in thousands): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Vehicle Control Engine Management (Ignition, Emissions and Fuel Delivery) $ 121,432 $ 113,188 $ 353,046 $ 342,860 Electrical and Safety 63,237 62,049 172,772 166,720 Wire Sets and Other 16,208 15,700 49,324 49,723 Total Vehicle Control 200,877 190,937 575,142 559,303 Temperature Control AC System Components 95,698 94,385 245,628 217,913 Other Thermal Components 30,287 29,258 76,446 75,210 Total Temperature Control 125,985 123,643 322,074 293,123 Engineered Solutions Commercial Vehicle 22,625 18,701 69,016 59,158 Construction/Agriculture 8,082 9,974 27,631 32,804 Light Vehicle 24,287 24,123 70,776 71,123 All Other 17,409 19,035 55,858 52,005 Total Engineered Solutions 72,403 71,833 223,281 215,090 Other — — — — Total $ 399,265 $ 386,413 $ 1,120,497 $ 1,067,516 The following tables provide disaggregation of net sales information by geographic area within each operating segment for the three and nine months ended September 30, 2024 and 2023 (in thousands): Three months ended September 30, 2024 Vehicle Temperature Engineered Other Total United States $ 180,071 $ 118,469 $ 40,629 $ — $ 339,169 Canada 9,413 6,998 8,218 — 24,629 Europe 234 102 11,409 — 11,745 Mexico 9,614 33 2,392 — 12,039 Asia 117 350 9,010 — 9,477 Other foreign 1,428 33 745 — 2,206 Total $ 200,877 $ 125,985 $ 72,403 $ — $ 399,265 Three months ended September 30, 2023 Vehicle Temperature Engineered Other Total United States $ 171,188 $ 116,684 $ 41,835 $ — $ 329,707 Canada 9,440 6,501 8,586 — 24,527 Europe 174 — 14,971 — 15,145 Mexico 8,968 29 1,311 — 10,308 Asia 132 367 4,416 — 4,915 Other foreign 1,035 62 714 — 1,811 Total $ 190,937 $ 123,643 $ 71,833 $ — $ 386,413 Nine months ended September 30, 2024 Vehicle Temperature Engineered Other Total United States $ 512,791 $ 300,766 $ 122,032 $ — $ 935,589 Canada 27,252 20,215 24,897 — 72,364 Europe 778 153 39,493 — 40,424 Mexico 30,429 42 7,322 — 37,793 Asia 245 645 27,215 — 28,105 Other foreign 3,647 253 2,322 — 6,222 Total $ 575,142 $ 322,074 $ 223,281 $ — $ 1,120,497 Nine months ended September 30, 2023 Vehicle Temperature Engineered Other Total United States $ 502,798 $ 278,354 $ 130,606 $ — $ 911,758 Canada 26,604 14,182 19,950 — 60,736 Europe 620 — 44,969 — 45,589 Mexico 25,734 47 5,117 — 30,898 Asia 282 387 12,743 — 13,412 Other foreign 3,265 153 1,705 — 5,123 Total $ 559,303 $ 293,123 $ 215,090 $ — $ 1,067,516

Commitment and Contingencies (T

Commitment and Contingencies (Tables)	9 Months Ended
Commitment and Contingencies (Tables)	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Schedule of Changes in Product Warranties	The following table provides the changes in our product warranties (in thousands): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Balance, beginning of period $ 27,543 $ 23,586 $ 21,134 $ 19,667 Liabilities accrued for current year sales 39,246 36,844 104,926 92,684 Settlements of warranty claims (35,060) (36,905) (94,331) (88,826) Balance, end of period $ 31,729 $ 23,525 $ 31,729 $ 23,525

Basis of Presentation (Details)

Basis of Presentation (Details)	9 Months Ended
Basis of Presentation (Details)	Sep. 30, 2024 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	2
Equity ownership in entities included in consolidated financial statements, minimum	50%

Business Acquisitions and Inv_3

Business Acquisitions and Investments- Narrative (Details) $ in Thousands, € in Millions	1 Months Ended						9 Months Ended
	Jul. 31, 2024 USD ($)	Jul. 31, 2024 EUR (€)	Jul. 31, 2023 USD ($)	Jul. 31, 2023 CNY (¥)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 CNY (¥)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Apr. 30, 2014 USD ($)
Business Acquisition [Line Items]
Investments in unconsolidated affiliates							$ 23,914		$ 24,050
Acquisition of and investment in businesses							0	$ 3,954
Goodwill							$ 134,725		$ 134,729
Foshan GWO YNG SMP Vehicle Climate Control Cooling Products Co Ltd
Business Acquisition [Line Items]
Equity method investment, ownership percentage					65%	65%				50%
Investments in unconsolidated affiliates										$ 14,000
Equity method investment, increase in ownership percentage					15%	15%
Acquisition of and investment in businesses					$ 4,200	¥ 26,475,583
Foshan GWO YNG SMP Vehicle Climate Control Cooling Products Co Ltd \| Gwo Yng Enterprise Co., Ltd.
Business Acquisition [Line Items]
Equity method investment, ownership percentage										50%
Nissens Automotive
Business Acquisition [Line Items]
Payments to acquire businesses	$ 388,000	€ 360
Foshan GWO YNG SMP Vehicle Climate Control Cooling Products Co Ltd
Business Acquisition [Line Items]
Payments to acquire businesses			$ 4,000	¥ 27,378,290
Step acquisition, equity interest in acquiree, subsequent acquisition			15%	15%
Step acquisition, equity interest in acquiree, including subsequent acquisition, percentage			80%
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles			$ 532
Goodwill			2,208
Foshan GWO YNG SMP Vehicle Climate Control Cooling Products Co Ltd \| Temperature Control Segment
Business Acquisition [Line Items]
Goodwill			1,200
Foshan GWO YNG SMP Vehicle Climate Control Cooling Products Co Ltd \| Engineered Solutions Segment
Business Acquisition [Line Items]
Goodwill			1,000
Foshan GWO YNG SMP Vehicle Climate Control Cooling Products Co Ltd \| Customer relationships
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles			$ 400
Finite-lived intangible asset, useful life			10 years

Business Acquisitions and Inv_4

Business Acquisitions and Investments - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) $ in Thousands	1 Months Ended
	Jul. 31, 2023 USD ($)	Jul. 31, 2023 CNY (¥)	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Assets acquired and liabilities assumed:
Goodwill			$ 134,725	$ 134,729
Foshan GWO YNG SMP Vehicle Climate Control Cooling Products Co Ltd
Business Acquisition [Line Items]
Total purchase consideration	$ 21,725
Assets acquired and liabilities assumed:
Cash and cash equivalents	6,779
Receivables	5,912
Inventory	5,945
Other current assets	528
Property, plant and equipment, net	2,924
Operating lease right-of-use assets	4,372
Intangible assets	532
Goodwill	2,208
Long term investments and other assets	7,257
Current liabilities	(6,004)
Noncurrent operating lease liabilities	(3,455)
Subtotal	26,998
Fair value of acquired noncontrolling interest	(5,273)
Total purchase consideration allocated to net assets acquired	21,725
Business combination, step acquisition, equity interest in acquiree, fair value	17,700
Payments to acquire businesses	$ 4,000	¥ 27,378,290
Step acquisition, equity interest in acquiree, subsequent acquisition	15%	15%
Customer relationships \| Foshan GWO YNG SMP Vehicle Climate Control Cooling Products Co Ltd
Assets acquired and liabilities assumed:
Intangible assets	$ 400
Computer software \| Foshan GWO YNG SMP Vehicle Climate Control Cooling Products Co Ltd
Assets acquired and liabilities assumed:
Intangible assets	$ 100

Restructuring and Integration_3

Restructuring and Integration Expenses - Narrative (Details) - Separation Program $ in Millions	Sep. 30, 2024 USD ($)
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	$ 7.6
Expected cost remaining, remainder of 2024	1.3
Expected cost remaining, 2025	0.6
Expected cost remaining, 2026	$ 0.1

Restructuring and Integration_4

Restructuring and Integration Expenses - Schedule of Related to the Separation Program Workforce Reduction (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Restructuring Reserve [Roll Forward]
Amounts provided for during 2024	$ 3,023	$ 177	$ 5,774	$ 1,383
Foreign currency exchange rate changes			1
Separation Program
Restructuring Reserve [Roll Forward]
Exit activity liability, beginning of period			0
Amounts provided for during 2024			5,602
Stock-based compensation			150
Cash payments			(959)
Exit activity liability, end of period	4,794		4,794
Separation Program \| Other
Restructuring Reserve [Roll Forward]
Amounts provided for during 2024			1,700
Separation Program \| Vehicle Control Segment \| Operating Segments
Restructuring Reserve [Roll Forward]
Amounts provided for during 2024			2,700
Separation Program \| Temperature Control Segment \| Operating Segments
Restructuring Reserve [Roll Forward]
Amounts provided for during 2024			600
Separation Program \| Engineered Solutions Segment \| Operating Segments
Restructuring Reserve [Roll Forward]
Amounts provided for during 2024			600
Cost Reduction Initiative
Restructuring Reserve [Roll Forward]
Exit activity liability, beginning of period			1,729
Amounts provided for during 2024			172
Cash payments			(1,532)
Foreign currency exchange rate changes			(22)
Exit activity liability, end of period	347		347
Cost Reduction Initiative \| Workforce Reduction
Restructuring Reserve [Roll Forward]
Exit activity liability, beginning of period			1,729
Amounts provided for during 2024			(45)
Cash payments			(1,315)
Foreign currency exchange rate changes			(22)
Exit activity liability, end of period	347		347
Cost Reduction Initiative \| Other Exit Costs
Restructuring Reserve [Roll Forward]
Exit activity liability, beginning of period			0
Amounts provided for during 2024			217
Cash payments			(217)
Foreign currency exchange rate changes			0
Exit activity liability, end of period	$ 0		0
Cost Reduction Initiative \| Vehicle Control Segment \| Operating Segments
Restructuring Reserve [Roll Forward]
Amounts provided for during 2024			61
Cost Reduction Initiative \| Temperature Control Segment \| Operating Segments
Restructuring Reserve [Roll Forward]
Amounts provided for during 2024			59
Cost Reduction Initiative \| Engineered Solutions Segment \| Operating Segments
Restructuring Reserve [Roll Forward]
Amounts provided for during 2024			$ 52

Sale of Receivables (Details)

Sale of Receivables (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Sale of Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Receivables [Abstract]
Sale of receivables to financial institutions	$ 285.4	$ 260.4	$ 686.3	$ 643
Receivables not yet collected	1.8		1.8
Charge related to sale of receivables	$ 14.9	$ 14.6	$ 38.3	$ 36.1

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Inventory Disclosure [Abstract]
Finished goods	$ 294,153	$ 302,557
Work in process	18,406	18,503
Raw materials	190,456	186,015
Subtotal	503,015	507,075
Unreturned customer inventories	17,843	18,240
Total inventories	$ 520,858	$ 525,315

Acquired Intangible Assets - Sc

Acquired Intangible Assets - Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Intangible Asset, Finite-Lived and Indefinite-Lived [Line Items]
Total acquired intangible assets	$ 187,205	$ 186,899
Less: Accumulated amortization	(102,379)	(95,681)
Net acquired intangible assets	84,826	91,218
Trademarks and trade names
Intangible Asset, Finite-Lived and Indefinite-Lived [Line Items]
Total acquired intangible assets	8,880	8,880
Trademarks and trade names
Intangible Asset, Finite-Lived and Indefinite-Lived [Line Items]
Indefinite-lived intangible assets (excluding goodwill)	2,600
Customer relationships
Intangible Asset, Finite-Lived and Indefinite-Lived [Line Items]
Total acquired intangible assets	159,934	159,641
Patents, developed technology and intellectual property
Intangible Asset, Finite-Lived and Indefinite-Lived [Line Items]
Total acquired intangible assets	14,123	14,123
Non-compete agreements
Intangible Asset, Finite-Lived and Indefinite-Lived [Line Items]
Total acquired intangible assets	3,308	3,295
Supply agreements
Intangible Asset, Finite-Lived and Indefinite-Lived [Line Items]
Total acquired intangible assets	800	800
Leaseholds
Intangible Asset, Finite-Lived and Indefinite-Lived [Line Items]
Total acquired intangible assets	$ 160	$ 160

Acquired Intangible Assets- Nar

Acquired Intangible Assets- Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 2.1	$ 2.1	$ 6.4	$ 6.4
Expected amortization remainder of 2024	2.1		2.1
Expected amortization of 2025	8.5		8.5
Expected amortization of 2026	8.5		8.5
Expected amortization of 2027	8.5		8.5
Expected amortization for 2028 through 2041	$ 54.6		$ 54.6

Leases- Narrative (Details)

Leases- Narrative (Details)	Sep. 30, 2024 renewal_option
Leases [Abstract]
Lessee, operating lease, remaining lease term (up to)	10 years
Lessee, operating lease, number of renewal options	1
Lessee, operating lease, renewal term	5 years

Leases - Schedule of Lessee Qua

Leases - Schedule of Lessee Quantitative Disclosures Related To Operating Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets
Operating lease right-of-use assets	$ 96,039	$ 100,065
Liabilities
Sundry payables and accrued expenses	16,848	17,139
Noncurrent operating lease liabilities	86,259	88,974
Total operating lease liabilities	$ 103,107	$ 106,113
Weighted Average Remaining Lease Term	7 years 10 months 24 days	8 years 3 months 18 days
Weighted Average Discount Rate	4.90%	4.80%

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Leases [Abstract]
Lease expense	$ 4,548	$ 4,762	$ 14,220	$ 11,647
Variable and other lease expense	1,545	1,354	2,953	2,637
Total lease costs	$ 6,093	$ 6,116	$ 17,173	$ 14,284

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Lessee, Lease, Description [Line Items]
Cash paid for the amounts included in the measurement of lease liabilities	$ 13,253	$ 8,212
Right-of-use assets obtained in exchange for new lease obligations	6,902	61,929
Foshan GWO YNG SMP Vehicle Climate Control Cooling Products Co Ltd
Lessee, Lease, Description [Line Items]
Right-of-use assets obtained in exchange for new lease obligations		4,400
POLAND
Lessee, Lease, Description [Line Items]
Right-of-use assets obtained in exchange for new lease obligations	4,700
TEXAS
Lessee, Lease, Description [Line Items]
Right-of-use assets obtained in exchange for new lease obligations	$ 27,800
KANSAS
Lessee, Lease, Description [Line Items]
Right-of-use assets obtained in exchange for new lease obligations		$ 26,100

Leases - Schedule of Lessee, Op

Leases - Schedule of Lessee, Operating Lease, Liability, to be Paid, Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Leases [Abstract]
Remainder of 2024	$ 4,711
2025	17,058
2026	15,711
2027	14,417
2028	12,647
Thereafter	62,118
Total lease payments	126,662
Less: Interest	(23,555)
Total operating lease liabilities	$ 103,107	$ 106,113

Credit Facilities and Long-Te_3

Credit Facilities and Long-Term Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Current maturities of debt	$ 2,685	$ 5,029
Long-term debt	140,163	151,182
Total debt	142,848	156,211
Credit facility – term loan due 2027 \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Total debt	0	92,500
Credit facility – revolver due 2027 \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Total debt	0	63,500
Credit facility – revolver due 2029 \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Total debt	140,000	0
Other
Debt Instrument [Line Items]
Current maturities of debt	2,685
Long-term debt	163
Total debt	$ 2,848	$ 211

Credit Facilities and Long-Te_4

Credit Facilities and Long-Term Debt - Narrative (Details) zł in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($) extension	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2024 PLN (zł) extension	Jul. 31, 2024 USD ($)	Jun. 30, 2022 USD ($)
Line of Credit Facility [Line Items]
Line of credit, noncurrent	$ 140,000,000		$ 151,000,000
Borrowings under credit agreement			156,000,000
Line of credit, current			5,000,000
Outstanding amount	2,300,000		2,300,000
Debt issuance costs	5,100,000		1,600,000
Amortization of deferred financing cost	1,655,000	$ 370,000
Interest expense	1,300,000
Amortization of financing costs, remainder of 2024	100,000
Amortization of financing costs of 2025	500,000
Amortization of financing costs of 2026	500,000
Amortization of financing costs of 2026	500,000
Amortization of financing costs of 2027	500,000
Amortization of financing costs of 2028	300,000
Interest Rate Swap
Line of Credit Facility [Line Items]
Derivative, notional amount						$ 100,000,000
2024 Credit Agreement
Line of Credit Facility [Line Items]
Borrowings under credit agreement	140,000,000
2024 Credit Agreement \| Interest Rate Swap
Line of Credit Facility [Line Items]
Derivative, notional amount	$ 100,000,000
2024 Credit Agreement \| Line of Credit
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
Leverage ratio	2.75			2.75
Debt, weighted average interest rate	5%			5%
2024 Credit Agreement \| Secured Debt \| Line of Credit
Line of Credit Facility [Line Items]
Debt instrument, number of extensions \| extension	2			2
Debt instrument, extension term	1 year			1 year
Accordion feature, increase limit	$ 168,000,000
Covenant, maximum, debt to EBITDA ratio	100%			100%
2024 Credit Agreement \| Revolving Credit Facility \| Line of Credit
Line of Credit Facility [Line Items]
Borrowing capacity	$ 750,000,000
2024 Credit Agreement \| Bridge Loan \| Line of Credit
Line of Credit Facility [Line Items]
Borrowing capacity	30,000,000
2024 Credit Agreement \| Letter of Credit \| Line of Credit
Line of Credit Facility [Line Items]
Borrowing capacity	$ 25,000,000
2024 Credit Agreement \| Minimum \| Base Rate \| Line of Credit
Line of Credit Facility [Line Items]
Variable rate	1.25%
2024 Credit Agreement \| Maximum \| Base Rate \| Line of Credit
Line of Credit Facility [Line Items]
Variable rate	2.25%
2024 Credit Agreement \| Debt Instrument, Redemption, Period One \| Secured Debt \| Line of Credit
Line of Credit Facility [Line Items]
Amortization percentage of periodic payment	1.25%
2024 Credit Agreement \| Debt Instrument, Redemption, Period Two \| Secured Debt \| Line of Credit
Line of Credit Facility [Line Items]
Amortization percentage of periodic payment	1.875%
2024 Credit Agreement \| Debt Instrument, Redemption, Period Three \| Secured Debt \| Line of Credit
Line of Credit Facility [Line Items]
Amortization percentage of periodic payment	2.50%
2024 Credit Agreement, Global Tranche \| Revolving Credit Facility \| Line of Credit
Line of Credit Facility [Line Items]
Borrowing capacity	$ 430,000,000
2024 Credit Agreement, Danish Tranche \| Secured Debt \| Line of Credit
Line of Credit Facility [Line Items]
Accordion feature, increase limit	5,000,000
2024 Credit Agreement, Danish Tranche \| Revolving Credit Facility \| Line of Credit
Line of Credit Facility [Line Items]
Borrowing capacity	10,000,000
Delayed Draw Term Loan Facility In US \| Secured Debt \| Line of Credit
Line of Credit Facility [Line Items]
Borrowing capacity	200,000,000
Euros Delayed Draw Term Loan Facility \| Secured Debt \| Line of Credit
Line of Credit Facility [Line Items]
Borrowing capacity	100,000,000
2022 Credit Agreement
Line of Credit Facility [Line Items]
Borrowings under credit agreement			$ 156,000,000
Debt, weighted average interest rate			5%
2022 Credit Agreement \| Interest Rate Swap
Line of Credit Facility [Line Items]
Derivative, notional amount			$ 100,000,000
2022 Credit Agreement \| Line of Credit
Line of Credit Facility [Line Items]
Debt, weighted average interest rate			5%
2022 Credit Agreement \| Secured Debt \| Line of Credit
Line of Credit Facility [Line Items]
Debt instrument, face amount					$ 125,000,000
Alternative Base Rate Loan \| Line of Credit
Line of Credit Facility [Line Items]
Average outstanding amount	800,000	$ 100,000	$ 100,000
Polish Overdraft Facility \| Line of Credit
Line of Credit Facility [Line Items]
Borrowing capacity	$ 7,500,000			zł 30
Threshold percentage of borrowing capacity	85%			85%
Threshold borrowing capacity limit	$ 6,400,000
Cancellation period	30 days
Bank overdrafts	$ 1,300,000		$ 0
Polish Overdraft Facility \| Warsaw Interbank Offered Rate \| Line of Credit
Line of Credit Facility [Line Items]
Variable rate	1%
Polish Overdraft Facility \| Euro Interbank Offered Rate \| Line of Credit
Line of Credit Facility [Line Items]
Variable rate	1%
Polish Overdraft Facility \| Mid-Point Fed Target Range Rate \| Line of Credit
Line of Credit Facility [Line Items]
Variable rate	1.25%

Credit Facilities and Long-Te_5

Credit Facilities and Long-Term Debt - Schedule of Maturities of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Line of Credit Facility [Line Items]
Remainder of 2024	$ 2,662
2025	34
2026	47
2027	105
2028	0
2029	140,000
Total debt	142,848	$ 156,211
Current maturities of debt	(2,685)	(5,029)
Long-term debt	140,163	151,182
Revolving Credit Facility \| Revolving Credit Facility \| Line of Credit
Line of Credit Facility [Line Items]
Remainder of 2024	0
2025	0
2026	0
2027	0
2028	0
2029	140,000
Total debt	140,000
Current maturities of debt	0
Long-term debt	140,000
Polish Overdraft Facility and Other Debt
Line of Credit Facility [Line Items]
Remainder of 2024	2,662
2025	34
2026	47
2027	105
2028	0
2029	0
Total debt	2,848	$ 211
Current maturities of debt	(2,685)
Long-term debt	$ 163

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income Attributable to SMP- Schedule of Accumulated Other Comprehensive by Component (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 654,322	$ 640,415	$ 650,873	$ 621,038
Other comprehensive income, net of tax	(80)	(2,245)	(3,583)	2,188
Ending balance	653,444	645,473	653,444	645,473
Unrealized loss on cash flow hedge, pretax	3,500		1,500
Unrealized loss on cash flow hedge, net of tax	2,600		1,100
Cash settlements payments, pretax	700		2,000
Cash settlement payments, net of tax	500		1,500
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(13,850)		(8,897)
Other comprehensive income (loss) before reclassifications	2,443		(2,510)
Amounts reclassified from accumulated other comprehensive income	0		0
Other comprehensive income, net of tax	2,443		(2,510)
Ending balance	(11,407)		(11,407)
Cash Flow Hedge
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	4,369		2,899
Other comprehensive income (loss) before reclassifications	(2,055)		406
Amounts reclassified from accumulated other comprehensive income	(497)		(1,488)
Other comprehensive income, net of tax	(2,552)		(1,082)
Ending balance	1,817		1,817
Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	19		24
Other comprehensive income (loss) before reclassifications	0		0
Amounts reclassified from accumulated other comprehensive income	(3)		(8)
Other comprehensive income, net of tax	(3)		(8)
Ending balance	16		16
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(9,462)	(7,927)	(5,974)	(12,470)
Other comprehensive income (loss) before reclassifications	388		(2,104)
Amounts reclassified from accumulated other comprehensive income	(500)		(1,496)
Other comprehensive income, net of tax	(112)	(2,292)	(3,600)	2,251
Ending balance	$ (9,574)	$ (10,219)	$ (9,574)	$ (10,219)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income Attributable to SMP- Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative cash flow hedge (gain) loss		$ 3,145	$ 3,621	$ 7,964	$ 10,766
Postretirement benefit plans unrecognized (gain) loss		(2,129)	(1,732)	(5,147)	(2,759)
Total before income tax		(36,123)	(32,917)	(73,927)	(74,723)
Income tax expense		(9,267)	(7,995)	(18,718)	(18,656)
Total reclassifications attributable to SMP	[1]	(3,810)	$ (6,659)	(29,697)	$ (27,714)
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before income tax		(676)		(2,024)
Income tax expense		(176)		(528)
Total reclassifications attributable to SMP		(500)		(1,496)
Reclassification out of Accumulated Other Comprehensive Income \| Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative cash flow hedge (gain) loss		(671)		(2,010)
Reclassification out of Accumulated Other Comprehensive Income \| Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Postretirement benefit plans unrecognized (gain) loss		$ (5)		$ (14)

[1] Throughout this Form 10-Q, “SMP” refers to Standard Motor Products, Inc. and subsidiaries.

Stock-Based Compensation Plan_2

Stock-Based Compensation Plans - Narrative (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($) Type shares	Sep. 30, 2023 USD ($)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of types of restricted stock \| Type	2
Stock-based compensation	$ 4,464	$ 5,243
Restricted Stock \| Executive Officer \| Share-Based Payment Arrangement, Tranche One
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage	25%
Vesting period, initial age limit	2 months
Restricted Stock \| Executive Officer \| Share-Based Payment Arrangement, Tranche Two
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period, fully vested age limit	2 months
Restricted Stock \| Employees
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, estimated forfeitures, percentage	5%
Restricted Stock \| Director
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, estimated forfeitures, percentage	0%
Performance Shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, expiration period	3 years
Share-based compensation arrangement by share-based payment award, measuring period for performance-based shares	3 years
Restricted And Performance Based Shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation	$ 4,100	4,900
Share-based payment arrangement, expense, after tax	3,100	$ 3,700
Share-based payment arrangement, nonvested award, excluding option, cost not yet recognized, amount	$ 8,600
Restricted And Performance Based Shares \| Employees
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition	3 years 4 months 24 days
Restricted And Performance Based Shares \| Director
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition	7 months 6 days
Minimum \| Restricted Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, expiration period	3 years
Minimum \| Restricted And Performance Based Shares \| Executives And Directors
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, holding period	1 year
Maximum \| Restricted And Performance Based Shares \| Executives And Directors
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, holding period	2 years
Share-Based Payment Arrangement, Employee \| Two Thousand And Sixteen Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares) \| shares	2,050,000

Stock-Based Compensation Plan_3

Stock-Based Compensation Plans - Schedule of Share-Based Payment Arrangement, Restricted Stock and Performance-Based Share Activity (Details) - Restricted And Performance Based Shares - $ / shares	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Shares
Balance at December 31, 2023 (in shares)	880,976
Granted (in shares)	6,775
Vested (in shares)	(44,121)
Forfeited (in shares)	(32,050)
Balance at September 30, 2024 (in shares)	811,580
Weighted Average Grant Date Fair Value Per Share
Balance at December 31, 2023 (in usd per share)	$ 29.43	$ 29.48
Granted (in usd per share)	27.64
Vested (in usd per share)	29.75
Forfeited (in usd per share)	29.95
Balance at September 30, 2024 (in usd per share)	$ 29.43

Employee Benefits (Details)

Employee Benefits (Details) $ in Millions	1 Months Ended	9 Months Ended
Employee Benefits (Details) $ in Millions	Mar. 31, 2024 USD ($)	Sep. 30, 2024 employee shares
Defined Benefit Plan Disclosure [Line Items]
Number of former union employees covered by the plan \| employee		13
Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Employer discretionary contribution amount \| $	$ 0.5
Employee Stock Ownership Plan And Trust (ESOP)
Defined Benefit Plan Disclosure [Line Items]
Additional shares contributed to ESOP (in shares)		68,700
Shares released from trust (in shares)		68,700
Total remaining balance of shares in the ESOP (in shares)		200

Derivative Financial Instrume_2

Derivative Financial Instruments (Details) € in Millions, $ in Millions	1 Months Ended			3 Months Ended	9 Months Ended
	Jul. 31, 2024 EUR (€)	Jul. 31, 2024 USD ($)	Jun. 30, 2022 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 EUR (€) contract	Sep. 30, 2024 USD ($) contract	Dec. 31, 2023 USD ($)
Derivative [Line Items]
Borrowings under credit agreement							$ 156
Nissens Automotive
Derivative [Line Items]
Payments to acquire businesses	€ 360	$ 388
Interest Rate Swap
Derivative [Line Items]
Derivative term of contract			7 years
Derivative, notional amount			$ 100
Derivative fair value						$ 2.5	$ 3.9
Interest Rate Swap Facility
Derivative [Line Items]
Borrowings under credit agreement			$ 100
Term of variable rate					1 month
Fixed interest rate					2.683%	2.683%
Foreign Exchange Contract
Derivative [Line Items]
Derivative, notional amount \| €					€ 100
Number of instruments held \| contract					3	3
Derivative, amount hedged item \| €					€ 100
Foreign Exchange Contract \| Designated as Hedging Instrument
Derivative [Line Items]
Fair value of the forward foreign exchange						$ 1
Change in fair value on derivative, net				$ 1

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value Inputs, Level 1 and Level 2 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 26,348	$ 32,526
Cash equivalents		3,000
Fair Value Inputs, Level 1 and Level 2 \| Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	26,348	32,526
Fair Value, Inputs, Level 1 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation	26,855	23,893
Cash	26,300	29,500
Fair Value, Inputs, Level 1 \| Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation	26,855	23,893
Fair Value, Inputs, Level 2 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short term borrowings	2,685	5,029
Long-term debt	140,163	151,182
Cash flow hedge interest rate swap	2,462	3,939
Short-term investments	7,050	0
Long-term investments	598	7,468
Forward foreign exchange contracts	995	0
Fair Value, Inputs, Level 2 \| Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short term borrowings	2,685	5,029
Long-term debt	140,163	151,182
Cash flow hedge interest rate swap	2,462	3,939
Short-term investments	7,050	0
Long-term investments	598	7,468
Forward foreign exchange contracts	$ 995	$ 0

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Reconciliations of Earnings Available to Common Stockholders and Shares used in Calculating Basic and Dilutive Net Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net Income (Loss) Attributable to Parent [Abstract]
Continuing operations		$ 26,581	$ 24,859	$ 54,424	$ 55,915
Discontinued operations		(22,771)	(18,200)	(24,727)	(28,201)
Net earnings attributable to SMP	[1]	$ 3,810	$ 6,659	$ 29,697	$ 27,714
Basic net earnings (loss) per common share attributable to SMP
Continuing operations (in dollars per share)		$ 1.22	$ 1.14	$ 2.50	$ 2.58
Discontinued operations (in dollars per share)		(1.04)	(0.83)	(1.14)	(1.30)
Diluted net earnings (loss) per common share attributable to SMP
Continuing operations (in dollars per share)		1.20	1.12	2.45	2.52
Discontinued operations (in dollars per share)		$ (1.03)	$ (0.82)	$ (1.11)	$ (1.27)
Weighted average common shares outstanding, basic (in shares)		21,716,083	21,727,119	21,802,164	21,675,699
Dilutive effect of restricted stock and performance-based stock (in shares)		438,000	527,000	423,000	522,000
Weighted average common shares outstanding, diluted (in shares)		22,154,222	22,253,723	22,225,444	22,198,131

[1] Throughout this Form 10-Q, “SMP” refers to Standard Motor Products, Inc. and subsidiaries.

Earnings Per Share - Schedule_2

Earnings Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Restricted And Performance Based Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	250	242	274	273

Industry Segments (Details)

Industry Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
Industry Segments (Details) $ in Thousands	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($)
Segment Reporting [Abstract]
Number of operating segments \| segment			3
Segment Reporting Information [Line Items]
Net sales	$ 399,265	$ 386,413	$ 1,120,497	$ 1,067,516
Operating income	37,139	34,806	76,744	82,730
Operating Segments \| Vehicle Control
Segment Reporting Information [Line Items]
Net sales	200,877	190,937	575,142	559,303
Operating income	21,029	18,071	51,685	54,719
Operating Segments \| Temperature Control
Segment Reporting Information [Line Items]
Net sales	125,985	123,643	322,074	293,123
Operating income	16,074	13,054	31,302	20,938
Operating Segments \| Engineered Solutions
Segment Reporting Information [Line Items]
Net sales	72,403	71,833	223,281	215,090
Operating income	5,010	7,254	13,054	19,064
Other
Segment Reporting Information [Line Items]
Net sales	0	0	0	0
Operating income	$ (4,974)	$ (3,573)	$ (19,297)	$ (11,991)

Net Sales - Major Product Group

Net Sales - Major Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	$ 399,265	$ 386,413	$ 1,120,497	$ 1,067,516
Operating Segments \| Vehicle Control
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	200,877	190,937	575,142	559,303
Operating Segments \| Temperature Control
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	125,985	123,643	322,074	293,123
Operating Segments \| Engineered Solutions
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	72,403	71,833	223,281	215,090
Operating Segments \| Engine Management (Ignition, Emissions and Fuel Delivery) \| Vehicle Control
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	121,432	113,188	353,046	342,860
Operating Segments \| Electrical and Safety \| Vehicle Control
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	63,237	62,049	172,772	166,720
Operating Segments \| Wire Sets and Other \| Vehicle Control
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	16,208	15,700	49,324	49,723
Operating Segments \| AC System Components \| Temperature Control
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	95,698	94,385	245,628	217,913
Operating Segments \| Other Thermal Components \| Temperature Control
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	30,287	29,258	76,446	75,210
Operating Segments \| Commercial Vehicle \| Engineered Solutions
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	22,625	18,701	69,016	59,158
Operating Segments \| Construction/Agriculture \| Engineered Solutions
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	8,082	9,974	27,631	32,804
Operating Segments \| Light Vehicle \| Engineered Solutions
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	24,287	24,123	70,776	71,123
Operating Segments \| All Other \| Engineered Solutions
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	17,409	19,035	55,858	52,005
Other
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	$ 0	$ 0	$ 0	$ 0

Net Sales - Geographic Area (De

Net Sales - Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	$ 399,265	$ 386,413	$ 1,120,497	$ 1,067,516
United States
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	339,169	329,707	935,589	911,758
Canada
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	24,629	24,527	72,364	60,736
Europe
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	11,745	15,145	40,424	45,589
Mexico
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	12,039	10,308	37,793	30,898
Asia
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	9,477	4,915	28,105	13,412
Other foreign
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	2,206	1,811	6,222	5,123
Operating Segments \| Vehicle Control
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	200,877	190,937	575,142	559,303
Operating Segments \| Vehicle Control \| United States
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	180,071	171,188	512,791	502,798
Operating Segments \| Vehicle Control \| Canada
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	9,413	9,440	27,252	26,604
Operating Segments \| Vehicle Control \| Europe
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	234	174	778	620
Operating Segments \| Vehicle Control \| Mexico
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	9,614	8,968	30,429	25,734
Operating Segments \| Vehicle Control \| Asia
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	117	132	245	282
Operating Segments \| Vehicle Control \| Other foreign
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	1,428	1,035	3,647	3,265
Operating Segments \| Temperature Control
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	125,985	123,643	322,074	293,123
Operating Segments \| Temperature Control \| United States
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	118,469	116,684	300,766	278,354
Operating Segments \| Temperature Control \| Canada
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	6,998	6,501	20,215	14,182
Operating Segments \| Temperature Control \| Europe
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	102	0	153	0
Operating Segments \| Temperature Control \| Mexico
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	33	29	42	47
Operating Segments \| Temperature Control \| Asia
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	350	367	645	387
Operating Segments \| Temperature Control \| Other foreign
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	33	62	253	153
Operating Segments \| Engineered Solutions
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	72,403	71,833	223,281	215,090
Operating Segments \| Engineered Solutions \| United States
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	40,629	41,835	122,032	130,606
Operating Segments \| Engineered Solutions \| Canada
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	8,218	8,586	24,897	19,950
Operating Segments \| Engineered Solutions \| Europe
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	11,409	14,971	39,493	44,969
Operating Segments \| Engineered Solutions \| Mexico
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	2,392	1,311	7,322	5,117
Operating Segments \| Engineered Solutions \| Asia
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	9,010	4,416	27,215	12,743
Operating Segments \| Engineered Solutions \| Other foreign
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	745	714	2,322	1,705
Other
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	0	0	0	0
Other \| United States
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	0	0	0	0
Other \| Canada
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	0	0	0	0
Other \| Europe
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	0	0	0	0
Other \| Mexico
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	0	0	0	0
Other \| Asia
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	0	0	0	0
Other \| Other foreign
Disaggregation of Revenue [Line Items]
Disaggregation of net sales	$ 0	$ 0	$ 0	$ 0

Commitment and Contingencies -

Commitment and Contingencies - Narrative (Details) $ in Millions	1 Months Ended	9 Months Ended		12 Months Ended	277 Months Ended
	Sep. 30, 2024 USD ($) claim	Sep. 30, 2024 USD ($) claim	Sep. 30, 2023 USD ($)	Aug. 31, 2024 USD ($)	Sep. 30, 2024 USD ($) claim
Asbestos-Related Damages
Loss Contingencies [Line Items]
Pending claims, approximate number \| claim	1,302	1,302			1,302
Payment for settled claims and awards related damages, including interest					$ 86.4
Loss contingency accrual	$ 99.6	$ 99.6			$ 99.6
Discontinued Operations \| Asbestos-Related Damages and Legal Costs
Loss Contingencies [Line Items]
Loss contingency payments		$ 10.3	$ 8.7
Discontinued Operations \| Asbestos-Related Damages
Loss Contingencies [Line Items]
Incremental pre-tax provision	$ 29.3
Minimum \| Asbestos-Related Damages
Loss Contingencies [Line Items]
Estimate of possible loss				$ 99.6
Loss contingency, increase (decrease) of estimated possible loss				15.6
Minimum \| Asbestos-Related Legal Costs
Loss Contingencies [Line Items]
Estimate of possible loss				49.8
Maximum \| Asbestos-Related Damages
Loss Contingencies [Line Items]
Estimate of possible loss				210.8
Loss contingency, increase (decrease) of estimated possible loss				75.5
Maximum \| Asbestos-Related Legal Costs
Loss Contingencies [Line Items]
Estimate of possible loss				$ 115.9

Commitment and Contingencies _2

Commitment and Contingencies - Schedule of Changes in Product Warranties (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Balance, beginning of period	$ 27,543	$ 23,586	$ 21,134	$ 19,667
Liabilities accrued for current year sales	39,246	36,844	104,926	92,684
Settlements of warranty claims	(35,060)	(36,905)	(94,331)	(88,826)
Balance, end of period	$ 31,729	$ 23,525	$ 31,729	$ 23,525