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Long-Term Debt (Tables) | 9 Months Ended
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Sep. 30, 2021
Debt Disclosure [Abstract] |
Schedule of maturities of long-term debt outstanding | Scheduled maturities of our long-term debt outstanding as of September 30, 2021 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2022 | ​ | 2023 | ​ | 2026 | ​ | MARAD | ​ | ​ |
​ |  | Notes |  | Notes |  | Notes |  | Debt |  | Total
Less than one year | ​ | $ | 35,000 | ​ | $ | — | ​ | $ | — | ​ | $ | 7,937 |  | $ | 42,937
One to two years | ​ |  | — | ​ |  | 30,000 | ​ |  | — | ​ |  | 8,333 |  | ​ | 38,333
Two to three years | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 8,749 |  | ​ | 8,749
Three to four years | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 9,186 |  | ​ | 9,186
Four to five years | ​ |  | — | ​ |  | — | ​ |  | 200,000 | ​ |  | 9,644 |  | ​ | 209,644
Over five years | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 5,001 |  | ​ | 5,001
Gross debt | ​ |  | 35,000 | ​ |  | 30,000 | ​ |  | 200,000 | ​ |  | 48,850 |  | ​ | 313,850
Unamortized debt issuance costs (1) | ​ |  | (112) | ​ |  | (359) | ​ |  | (6,203) | ​ |  | (2,683) |  | ​ | (9,357)
Total debt | ​ |  | 34,888 | ​ |  | 29,641 | ​ |  | 193,797 | ​ |  | 46,167 |  | ​ | 304,493
Less current maturities | ​ |  | (34,888) | ​ |  | — | ​ |  | — | ​ |  | (7,937) |  | ​ | (42,825)
Long-term debt | ​ | $ | — | ​ | $ | 29,641 | ​ | $ | 193,797 | ​ | $ | 38,230 |  | $ | 261,668
(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 | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
Interest expense | ​ | $ | 6,097 | ​ | $ | 8,007 | ​ | $ | 18,152 |  | $ | 22,580 | ​
Capitalized interest | ​ |  | — | ​ |  | — | ​ |  | — |  | ​ | (1,182) | ​
Interest income | ​ |  | (169) | ​ |  | (409) | ​ |  | (252) |  | ​ | (991) | ​
Net interest expense | ​ | $ | 5,928 | ​ | $ | 7,598 | ​ | $ | 17,900 |  | $ | 20,407 | ​

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