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Other Long-Term Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Other Liabilities Disclosure [Abstract] |  |
Black lung obligations | $ 34,515 | $ 34,482
Other | 500 | 1,842
Total other long-term liabilities | $ 35,015 | $ 36,324

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