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Long-Term Debt (Tables) | 9 Months Ended
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Sep. 30, 2022
Debt Disclosure [Abstract] |
Schedule of maturities of long-term debt outstanding | Scheduled maturities of our long-term debt outstanding as of September 30, 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) | ​ |  | (179) | ​ |  | (4,958) | ​ |  | (2,195) |  | ​ | (7,332)
Total debt | ​ |  | 29,821 | ​ |  | 195,042 | ​ |  | 38,718 |  | ​ | 263,581
Less current maturities | ​ |  | (29,821) | ​ |  | — | ​ |  | (8,333) |  | ​ | (38,154)
Long-term debt | ​ | $ | — | ​ | $ | 195,042 | ​ | $ | 30,385 |  | $ | 225,427
(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 | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021
Interest expense | ​ | $ | 4,923 | ​ | $ | 6,097 | ​ | $ | 15,264 |  | $ | 18,152
Interest income | ​ |  | (279) | ​ |  | (169) | ​ |  | (647) |  | ​ | (252)
Net interest expense | ​ | $ | 4,644 | ​ | $ | 5,928 | ​ | $ | 14,617 |  | $ | 17,900

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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 https://asc.fasb.org/extlink&oid=123465755&loc=d3e1835-112601 + Details
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