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Long-Term Debt | 6 Months Ended
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Jun. 30, 2023
Long-Term Debt |
Long-Term Debt | 5. Long-Term Debt ​ Long–term debt is comprised of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
(in thousands) |  | 2023 | ​ | 2022
Credit Facility | ​ | $ | 341,775 | ​ | $ | 251,250
​ | ​ | ​ | ​ | ​ | ​ | ​
6.25% senior notes due April 2028: | ​ | ​ | ​ | ​ | ​ | ​
Principal outstanding | ​ |  | 800,000 | ​ |  | 800,000
Unamortized debt premium | ​ | ​ | 9,527 | ​ |  | 10,530
Unamortized debt issuance costs | ​ |  | (7,913) | ​ |  | (8,744)
​ | ​ |  | 801,614 | ​ |  | 801,786
​ | ​ | ​ | ​ | ​ | ​ | ​
6.875% senior notes due April 2027: | ​ | ​ | ​ | ​ | ​ | ​
Principal outstanding | ​ | ​ | 500,000 | ​ |  | 500,000
Unamortized debt issuance costs | ​ | ​ | (4,150) | ​ |  | (4,702)
​ | ​ | ​ | 495,850 | ​ |  | 495,298
​ | ​ | ​ | ​ | ​ | ​ | ​
Long-term debt | ​ | $ | 1,639,239 | ​ | $ | 1,548,334
​ As of June 30, 2023, there were $4.5 million letters of credit outstanding under the Credit Facility and the applicable margin on borrowings outstanding was 2.4%. The weighted average annual interest rate on the outstanding balance under the Credit Facility, excluding the effect of interest rate swaps, was 7.7% and 6.9% at June 30, 2023 and December 31, 2022, respectively. We incurred $0.4 million and $0.5 million of commitment fees on the daily unused amount of the Credit Facility during the three months ended June 30, 2023 and 2022, respectively, and $0.9 million and $1.0 million during the six months ended June 30, 2023 and 2022, respectively. As of June 30, 2023, we were in compliance with all covenants under our Credit Facility agreement. Additionally, all undrawn capacity on our Credit Facility was available for borrowings as of June 30, 2023. ​ Amended and Restated Credit Agreement On May 16, 2023, we amended and restated our Credit Facility to, among other things:
| ● | extend the maturity date of the Credit Facility from November 8, 2024 to May 16, 2028 (or December 2, 2026 or December 3, 2027 if any portion of 2027 Senior Notes and 2028 Senior Notes, respectively, remain outstanding at such date);
| ● | change the referenced rate from LIBOR to SOFR so that borrowings under the Credit Facility bear interest at, based on our election, either a base rate or SOFR, plus an applicable margin;
| ● | increase the portion of the Credit Facility available for the issuance of swing line loans from $50.0 million to $75.0 million.
​ We incurred $6.0 million in transaction costs related to the Amended and Restated Credit Agreement, which were included in other assets in our condensed consolidated balance sheets and are being amortized over the remaining term of the Credit Facility. In addition, we wrote off $1.0 million of unamortized deferred financing costs as a result of the Amended and Restated Credit Agreement, which was recorded to interest expense in our condensed consolidated statements of operations during the three and six months ended June 30, 2023.

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- Definition The entire disclosure for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 470 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//470/tableOfContent + Details
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