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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2022
Fair Value Disclosures [Abstract] |
Schedule of principal amount and estimated fair value of long-term debt | The principal amount and estimated fair value of our long-term debt are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2022 | ​ | December 31, 2021
​ | ​ | Principal | ​ | Fair | ​ | Principal | ​ | Fair
​ |  | Amount (1) |  | Value (2) |  | Amount (1) |  | Value (2)
MARAD Debt (matures February 2027) | ​ | $ | 44,930 | ​ | $ | 45,851 | ​ | $ | 48,850 | ​ | $ | 52,481
2022 Notes (matured May 2022) | ​ |  | — | ​ |  | — | ​ |  | 35,000 | ​ |  | 34,794
2023 Notes (mature September 2023) | ​ |  | 30,000 | ​ |  | 29,615 | ​ |  | 30,000 | ​ |  | 29,054
2026 Notes (mature February 2026) | ​ |  | 200,000 | ​ |  | 191,902 | ​ |  | 200,000 | ​ |  | 200,562
Total debt | ​ | $ | 274,930 | ​ | $ | 267,368 | ​ | $ | 313,850 | ​ | $ | 316,891
(1) | Principal amount includes current maturities and excludes any related unamortized debt issuance costs. See Note 5 for additional disclosures on our long-term debt.
(2) | The estimated fair value of the 2022 Notes, the 2023 Notes and the 2026 Notes was determined using Level 1 fair value inputs under the market approach. The fair value of the MARAD Debt was estimated using Level 2 fair value inputs under the market approach, which was determined using a third-party evaluation of the remaining average life and outstanding principal balance of the indebtedness as compared to other obligations in the marketplace with similar terms.

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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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