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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2021
Fair Value Measurements |
Fair value of financial instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | ​ |  | 2021 |  | ​ |  | ​ |  | 2020 |  | ​
​ | ​ | Effective | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Effective | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Interest | ​ | Carrying | ​ | Fair | ​ | Interest | ​ | Carrying | ​ | Fair
​ | ​ | Rate | ​ | Value | ​ | Value | ​ | Rate | ​ | Value | ​ | Value
​ | (Dollars in thousands)
4.625% senior notes due September 2021 |  | — | % | $ | — | ​ | $ | — |  | 5.65 | % | $ | 86,329 | ​ | $ | 78,862
5.50% senior notes due January 2023 |  | 5.87 | % |  | 24,446 | ​ |  | 24,736 |  | 5.85 | % |  | 28,443 | ​ |  | 18,768
5.10% senior notes due September 2023 |  | 5.42 | % |  | 82,703 | ​ |  | 84,044 |  | 5.32 | % |  | 121,077 | ​ |  | 78,435
0.75% senior exchangeable notes due January 2024 |  | 5.90 | % |  | 259,839 | ​ |  | 257,730 |  | 6.06 | % |  | 279,700 | ​ |  | 169,458
5.75% senior notes due February 2025 | ​ | 6.03 | % |  | 548,458 | ​ |  | 508,881 |  | 6.01 | % |  | 610,818 | ​ |  | 318,871
6.50% senior priority guaranteed notes due February 2025 | ​ | 6.50 | % |  | 50,485 | ​ |  | 50,490 |  | 6.50 | % |  | 50,485 | ​ |  | 44,059
9.00% senior priority guaranteed notes due February 2025 | ​ | 9.00 | % | ​ | 218,082 | ​ | ​ | 226,914 | ​ | 9.00 | % | ​ | 192,032 | ​ |  | 185,221
7.25% senior guaranteed notes due January 2026 | ​ | 7.52 | % |  | 559,978 | ​ |  | 522,079 |  | 7.51 | % |  | 559,978 | ​ |  | 396,106
7.375% senior priority guaranteed notes due May 2027 | ​ | 7.74 | % |  | 700,000 | ​ |  | 724,906 |  | — | % |  | — | ​ |  | —
7.50% senior guaranteed notes due January 2028 | ​ | 7.70 | % |  | 389,609 | ​ |  | 346,966 |  | 7.69 | % |  | 389,609 | ​ |  | 267,369
2018 revolving credit facility |  | 3.72 | % |  | 460,000 | ​ |  | 460,000 |  | 3.53 | % |  | 672,500 | ​ |  | 672,500
​ | ​ | ​ | ​ | $ | 3,293,600 | ​ | $ | 3,206,746 | ​ | ​ | ​ | $ | 2,990,971 | ​ | $ | 2,229,649
Less: deferred financing costs | ​ | ​ | ​ | ​ | 30,805 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 22,270 | ​ | ​ | ​
​ | ​ | ​ | ​ | $ | 3,262,795 | ​ | ​ | ​ | ​ | ​ | ​ | $ | 2,968,701 | ​ | ​ | ​

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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