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Long-Term Debt (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2024
Long-Term Debt |
Schedule of long-term debt | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | March 31, 2024 |  | December 31, 2023
Credit Facility | ​ | $ | 268,500 | ​ | $ | 287,025
​ | ​ | ​ | ​ | ​ | ​ | ​
6.25% senior notes due April 2028: | ​ | ​ | ​ | ​ | ​ | ​
Principal outstanding | ​ |  | 800,000 | ​ |  | 800,000
Unamortized debt premium | ​ | ​ | 8,023 | ​ |  | 8,524
Unamortized debt issuance costs | ​ |  | (6,647) | ​ |  | (7,081)
​ | ​ |  | 801,376 | ​ |  | 801,443
​ | ​ | ​ | ​ | ​ | ​ | ​
6.875% senior notes due April 2027: | ​ | ​ | ​ | ​ | ​ | ​
Principal outstanding | ​ | ​ | 500,000 | ​ |  | 500,000
Unamortized debt issuance costs | ​ | ​ | (3,310) | ​ |  | (3,599)
​ | ​ | ​ | 496,690 | ​ |  | 496,401
​ | ​ | ​ | ​ | ​ | ​ | ​
Long-term debt | ​ | $ | 1,566,566 | ​ | $ | 1,584,869

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