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Long-Term Debt (Tables) | 6 Months Ended
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Jun. 30, 2021
Debt Disclosure [Abstract] |
Schedule of maturities of long-term debt outstanding | Scheduled maturities of our long-term debt outstanding as of June 30, 2021 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Term | ​ | 2022 | ​ | 2023 | ​ | 2026 | ​ | MARAD | ​ | ​ |
​ |  | Loan |  | Notes |  | Notes |  | Notes |  | Debt |  | Total
Less than one year | ​ | $ | 28,000 | ​ | $ | 35,000 | ​ | $ | — | ​ | $ | — | ​ | $ | 7,746 |  | $ | 70,746
One to two years | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 8,133 |  | ​ | 8,133
Two to three years | ​ |  | — | ​ |  | — | ​ |  | 30,000 | ​ |  | — | ​ |  | 8,538 |  | ​ | 38,538
Three to four years | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 8,965 |  | ​ | 8,965
Four to five years | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 200,000 | ​ |  | 9,412 |  | ​ | 209,412
Over five years | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 9,882 |  | ​ | 9,882
Gross debt | ​ |  | 28,000 | ​ |  | 35,000 | ​ |  | 30,000 | ​ |  | 200,000 | ​ |  | 52,676 |  | ​ | 345,676
Unamortized debt issuance costs (1) | ​ |  | (95) | ​ |  | (159) | ​ |  | (402) | ​ |  | (6,501) | ​ |  | (2,805) |  | ​ | (9,962)
Total debt | ​ |  | 27,905 | ​ |  | 34,841 | ​ |  | 29,598 | ​ |  | 193,499 | ​ |  | 49,871 |  | ​ | 335,714
Less current maturities | ​ |  | (27,905) | ​ |  | (34,841) | ​ |  | — | ​ |  | — | ​ |  | (7,746) |  | ​ | (70,492)
Long-term debt | ​ | $ | — | ​ | $ | — | ​ | $ | 29,598 | ​ | $ | 193,499 | ​ | $ | 42,125 |  | $ | 265,222
(1) | Debt issuance costs are amortized to interest expense over the term of the applicable debt agreement. See Note 1 for accounting changes as a result of the adoption of ASU No. 2020-06.
Schedule of components of net interest expense | The following table details the components of our net interest expense (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
Interest expense | ​ | $ | 5,943 | ​ | $ | 7,179 | ​ | $ | 12,055 |  | $ | 14,573 | ​
Capitalized interest | ​ |  | — | ​ |  | — | ​ |  | — |  | ​ | (1,182) | ​
Interest income | ​ |  | (24) | ​ |  | (116) | ​ |  | (83) |  | ​ | (582) | ​
Net interest expense | ​ | $ | 5,919 | ​ | $ | 7,063 | ​ | $ | 11,972 |  | $ | 12,809 | ​

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