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Long-Term Debt (Tables) | 6 Months Ended
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Jun. 30, 2022
Debt Disclosure [Abstract] |
Schedule of maturities of long-term debt outstanding | Scheduled maturities of our long-term debt outstanding as of June 30, 2022 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2023 | ​ | 2026 | ​ | MARAD | ​ | ​ |
​ |  | Notes |  | Notes |  | Debt |  | Total
Less than one year | ​ | $ | — | ​ | $ | — | ​ | $ | 8,133 |  | $ | 8,133
One to two years | ​ |  | 30,000 | ​ |  | — | ​ |  | 8,538 |  | ​ | 38,538
Two to three years | ​ |  | — | ​ |  | — | ​ |  | 8,965 |  | ​ | 8,965
Three to four years | ​ |  | — | ​ |  | 200,000 | ​ |  | 9,412 |  | ​ | 209,412
Four to five years | ​ |  | — | ​ |  | — | ​ |  | 9,882 |  | ​ | 9,882
Gross debt | ​ |  | 30,000 | ​ |  | 200,000 | ​ |  | 44,930 |  | ​ | 274,930
Unamortized debt issuance costs (1) | ​ |  | (225) | ​ |  | (5,278) | ​ |  | (2,317) |  | ​ | (7,820)
Total debt | ​ |  | 29,775 | ​ |  | 194,722 | ​ |  | 42,613 |  | ​ | 267,110
Less current maturities | ​ |  | — | ​ |  | — | ​ |  | (8,133) |  | ​ | (8,133)
Long-term debt | ​ | $ | 29,775 | ​ | $ | 194,722 | ​ | $ | 34,480 |  | $ | 258,977
(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,
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021
Interest expense | ​ | $ | 5,034 | ​ | $ | 5,943 | ​ | $ | 10,341 |  | $ | 12,055
Interest income | ​ |  | (235) | ​ |  | (24) | ​ |  | (368) |  | ​ | (83)
Net interest expense | ​ | $ | 4,799 | ​ | $ | 5,919 | ​ | $ | 9,973 |  | $ | 11,972

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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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