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Other Long-Term Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2022
Other Liabilities Disclosure [Abstract] |
Other Long-Term Liabilities | Other long-term liabilities are summarized as follows (in thousands):
| June 30, 2022 |  | December 31, 2021
Black lung obligations | $ | 34,515 |  |  | $ | 34,482 |
Other | 500 |  |  | 1,842 |
Total other long-term liabilities | $ | 35,015 |  |  | $ | 36,324 |

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- Definition Tabular disclosure of other noncurrent liabilities. + References No definition available. + Details
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