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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2021
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, 2021 | ​ | December 31, 2020
​ | ​ | Principal | ​ | Fair | ​ | Principal | ​ | Fair
​ |  | Amount (1) |  | Value (2) (3) |  | Amount (1) |  | Value (2) (3)
Term Loan (matures December 2021) | ​ | $ | 28,000 | ​ | $ | 27,895 | ​ | $ | 29,750 | ​ | $ | 28,969
Nordea Q5000 Loan (matured January 2021) (4) | ​ |  | — | ​ |  | — | ​ |  | 53,572 | ​ |  | 53,598
MARAD Debt (matures February 2027) | ​ |  | 52,676 | ​ |  | 56,542 | ​ |  | 56,410 | ​ |  | 62,318
2022 Notes (mature May 2022) | ​ |  | 35,000 | ​ |  | 35,199 | ​ |  | 35,000 | ​ |  | 33,513
2023 Notes (mature September 2023) | ​ |  | 30,000 | ​ |  | 29,662 | ​ |  | 30,000 | ​ |  | 28,650
2026 Notes (mature February 2026) | ​ |  | 200,000 | ​ |  | 247,359 | ​ |  | 200,000 | ​ |  | 211,383
Total debt | ​ | $ | 345,676 | ​ | $ | 396,657 | ​ | $ | 404,732 | ​ | $ | 418,431
(1) | Principal amount includes current maturities and excludes any related unamortized debt discount and 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 Term Loan, the Nordea Q5000 Loan and 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.
(3) | The principal amount and estimated fair value of the 2022 Notes, the 2023 Notes and the 2026 Notes are for the entire instrument inclusive of the conversion feature, which had been accounted for in shareholders’ equity through December 31, 2020.
(4) | The Nordea Q5000 Loan was fully repaid upon maturity in January 2021 (Note 5).

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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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