The revolving credit facility has a maturity date of October 2, 2025 and an applicable margin (at our election) of 4.00% for LIBOR-based borrowings or 3.00% for alternate base rate borrowings, with a 0.25% reduction in each case if the consolidated first lien leverage ratio, as defined in the Credit Agreement, does not exceed 3.20 to 1.00. At June 30, 2021 and December 31, 2020, there were 0 borrowings outstanding under the revolving credit facility. Stand-by letters of credit of $18.1 million were outstanding under our revolving credit facility as of June 30, 2021. The stand-by letters of credit are renewable annually and reduce the borrowing availability under the revolving credit facility. As of June 30, 2021, $231.9 million was available for borrowing under the revolving credit facility.
The weighted-average interest rate on outstanding borrowings under our credit facility was 4.25% and 5.75% as of June 30, 2021 and December 31, 2020, respectively. Interest is payable at least quarterly.
Credit Agreement Covenant Compliance
The Credit Agreement contains various provisions and covenants, including, among other items, restrictions on the ability to pay dividends, incur additional indebtedness, and issue certain capital stock. We have agreed to maintain certain financial ratios, including a maximum consolidated first lien leverage ratio, as defined in the Credit Agreement. Among other things, it will be an event of default, with respect to the revolving credit facility only, if our consolidated first lien leverage ratio as of the end of any fiscal quarter is greater than 5.85:1.00. As of June 30, 2021, our consolidated first lien leverage ratio under the Credit Agreement was 3.96:1.00. As of June 30, 2021, we were in compliance with the Credit Agreement covenants.
Senior Notes
On October 2, 2020, we completed an offering of $750.0 million aggregate principal amount of 6.50% unsubordinated secured notes due 2028 (the “6.50% Senior Notes”). The 6.50% Senior Notes were priced at par and bear interest at a rate of 6.50%, payable semi-annually on April 1 and October 1 of each year, beginning on April 1, 2021. The 6.50% Senior Notes will mature on October 1, 2028. The net proceeds from the issuance of the 6.50% Senior Notes were used to redeem our then outstanding $440.5 million aggregate principal amount of 6.50% Senior Notes due in October 2022 at a price equal to 100% of the aggregate principal amount plus accrued and unpaid interest through the redemption date, to repay a portion of the outstanding borrowings under the previous credit agreement as part of the refinancing in October 2020 and to pay related fees and expenses.
On March 18, 2021, we issued $400.0 million aggregate principal amount 5.00% Senior Notes, together with the 6.50% Senior Notes (the “Senior Notes”). The 5.00% Senior Notes were priced at par and bear interest at a rate of 5.00% per year, payable semi-annually on April 1 and October 1 of each year, beginning on October 1, 2021. The 5.00% Senior Notes will mature on October 1, 2028. Deferred debt issuance costs of $3.8 million incurred in connection with the issuance of the 5.00% Senior Notes are being amortized using the effective interest method over the term of the Senior Notes. The net proceeds from the issuance of the 5.00% Senior Notes were used to repay $397.0 million of the Term Loans outstanding under the Credit Agreement.
The Senior Notes are unsubordinated secured obligations of the Company, secured by a first priority lien on the collateral that secures the Company’s obligations under the Credit Agreement. The Senior Notes are fully and unconditionally guaranteed on a first priority secured basis by the Company and the majority of our wholly-owned subsidiaries. The offerings of the Senior Notes have not been registered under the Securities Act of 1933, as amended or any state securities laws.
Senior Notes Covenant Compliance
Subject to certain exceptions and qualifications, the indentures governing the Senior Notes contains customary covenants that, among other things, limits the Company and its restricted subsidiaries’ ability to: incur additional debt or issue certain preferred stock; pay dividends or make other distributions on capital stock or prepay subordinated indebtedness; purchase or redeem any equity interests; make investments; create liens; sell assets; enter into agreements that restrict dividends or other payments by restricted subsidiaries; consolidate, merge or transfer all or substantially all of its assets; engage in