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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2022
Debt Disclosure [Abstract] |
Schedule of long-term debt | Long-term debt consists of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ | ​ | 2022 |  | 2021
2022 Notes (matured May 2022) | ​ | $ | — | ​ | $ | 35,000
2023 Notes (mature September 2023) | ​ | ​ | 30,000 | ​ | ​ | 30,000
2026 Notes (mature February 2026) | ​ |  | 200,000 | ​ |  | 200,000
MARAD Debt (matures February 2027) | ​ |  | 40,913 | ​ |  | 48,850
Unamortized debt issuance costs | ​ |  | (6,838) | ​ |  | (8,840)
Total debt | ​ |  | 264,075 | ​ |  | 305,010
Less current maturities | ​ |  | (38,200) | ​ |  | (42,873)
Long-term debt | ​ | $ | 225,875 | ​ | $ | 262,137
​
Schedule of maturities of long-term debt outstanding | Scheduled maturities of our long-term debt outstanding as of December 31, 2022 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2023 | ​ | 2026 | ​ | MARAD | ​ | ​ |
​ |  | Notes |  | Notes |  | Debt |  | Total
Less than one year | ​ | $ | 30,000 | ​ | $ | — | ​ | $ | 8,333 |  | $ | 38,333
One to two years | ​ |  | — | ​ |  | — | ​ |  | 8,749 |  | ​ | 8,749
Two to three years | ​ |  | — | ​ |  | — | ​ |  | 9,186 |  | ​ | 9,186
Three to four years | ​ |  | — | ​ |  | 200,000 | ​ |  | 9,644 |  | ​ | 209,644
Four to five years | ​ |  | — | ​ |  | — | ​ |  | 5,001 |  | ​ | 5,001
Gross debt | ​ |  | 30,000 | ​ |  | 200,000 | ​ |  | 40,913 |  | ​ | 270,913
Unamortized debt issuance costs (1) | ​ |  | (133) | ​ |  | (4,632) | ​ |  | (2,073) |  | ​ | (6,838)
Total debt | ​ |  | 29,867 | ​ |  | 195,368 | ​ |  | 38,840 |  | ​ | 264,075
Less current maturities | ​ |  | (29,867) | ​ |  | — | ​ |  | (8,333) |  | ​ | (38,200)
Long-term debt | ​ | $ | — | ​ | $ | 195,368 | ​ | $ | 30,507 |  | $ | 225,875
(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): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2022 |  | 2021 |  | 2020
Interest expense | ​ | $ | 20,176 | ​ | $ | 23,489 | ​ | $ | 30,538
Capitalized interest | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1,182)
Interest income | ​ | ​ | (1,226) | ​ | ​ | (288) | ​ | ​ | (825)
Net interest expense | ​ | $ | 18,950 | ​ | $ | 23,201 | ​ | $ | 28,531

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