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Long-Term Debt (Tables) | 3 Months Ended
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Mar. 31, 2022
Debt Disclosure [Abstract] |
Schedule of maturities of long-term debt outstanding | Scheduled maturities of our long-term debt outstanding as of March 31, 2022 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2022 | ​ | 2023 | ​ | 2026 | ​ | MARAD | ​ | ​ |
​ |  | Notes |  | Notes |  | Notes |  | Debt |  | Total
Less than one year | ​ | $ | 35,000 | ​ | $ | — | ​ | $ | — | ​ | $ | 8,133 |  | $ | 43,133
One to two years | ​ |  | — | ​ |  | 30,000 | ​ |  | — | ​ |  | 8,539 |  | ​ | 38,539
Two to three years | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 8,965 |  | ​ | 8,965
Three to four years | ​ |  | — | ​ |  | — | ​ |  | 200,000 | ​ |  | 9,412 |  | ​ | 209,412
Four to five years | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 9,881 |  | ​ | 9,881
Gross debt | ​ |  | 35,000 | ​ |  | 30,000 | ​ |  | 200,000 | ​ |  | 44,930 |  | ​ | 309,930
Unamortized debt issuance costs (1) | ​ |  | (16) | ​ |  | (270) | ​ |  | (5,592) | ​ |  | (2,439) |  | ​ | (8,317)
Total debt | ​ |  | 34,984 | ​ |  | 29,730 | ​ |  | 194,408 | ​ |  | 42,491 |  | ​ | 301,613
Less current maturities | ​ |  | (34,984) | ​ |  | — | ​ |  | — | ​ |  | (8,133) |  | ​ | (43,117)
Long-term debt | ​ | $ | — | ​ | $ | 29,730 | ​ | $ | 194,408 | ​ | $ | 34,358 |  | $ | 258,496
(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
​ | ​ | March 31,
​ |  | 2022 |  | 2021
Interest expense | ​ | $ | 5,307 |  | $ | 6,112
Interest income | ​ |  | (133) |  | ​ | (59)
Net interest expense | ​ | $ | 5,174 |  | $ | 6,053

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- Definition Tabular disclosure of interest income and expense, including, but not limited to, interest income and expense from investments, loans, and securities. + References No definition available. + Details
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- Definition Tabular disclosure of maturity and sinking fund requirement for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123465755&loc=d3e1835-112601 + Details
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