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Long-Term Debt (Tables) | 6 Months Ended
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Jun. 30, 2023
Debt Disclosure [Abstract] |
Schedule of maturities of long-term debt outstanding | Scheduled maturities of our long-term debt outstanding as of June 30, 2023 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2023 | ​ | 2026 | ​ | MARAD | ​ | ​ |
​ |  | Notes |  | Notes |  | Debt |  | Total
Less than one year | ​ | $ | 30,000 | ​ | $ | — | ​ | $ | 8,538 |  | $ | 38,538
One to two years | ​ |  | — | ​ |  | — | ​ |  | 8,965 |  | ​ | 8,965
Two to three years | ​ |  | — | ​ |  | 200,000 | ​ |  | 9,412 |  | ​ | 209,412
Three to four years | ​ |  | — | ​ |  | — | ​ |  | 9,882 |  | ​ | 9,882
Gross debt | ​ |  | 30,000 | ​ |  | 200,000 | ​ |  | 36,797 |  | ​ | 266,797
Unamortized debt issuance costs (1) | ​ |  | (39) | ​ |  | (3,961) | ​ |  | (1,829) |  | ​ | (5,829)
Total debt | ​ |  | 29,961 | ​ |  | 196,039 | ​ |  | 34,968 |  | ​ | 260,968
Less current maturities | ​ |  | (29,961) | ​ |  | — | ​ |  | (8,538) |  | ​ | (38,499)
Long-term debt | ​ | $ | — | ​ | $ | 196,039 | ​ | $ | 26,430 |  | $ | 222,469
(1) | Debt issuance costs are amortized to interest expense over the term of the applicable debt agreement.
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,
​ |  | 2023 |  | 2022 |  | 2023 |  | 2022
Interest expense | ​ | $ | 4,857 | ​ | $ | 5,034 | ​ | $ | 9,726 |  | $ | 10,341
Interest income | ​ |  | (629) | ​ |  | (235) | ​ |  | (1,311) |  | ​ | (368)
Net interest expense | ​ | $ | 4,228 | ​ | $ | 4,799 | ​ | $ | 8,415 |  | $ | 9,973

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