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Segment Information - Schedule of Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Coal revenues $ 529,667 $ 861,283
Other revenues 2,290 2,789
Total revenues 531,957 864,072
Cost of coal sales (exclusive of items shown separately below) 504,584 648,313
Depreciation, depletion and amortization 43,910 40,701
Accretion on asset retirement obligations 5,614 6,143
Amortization of acquired intangibles 1,357 1,675
Selling, general and administrative expenses 15,424 22,377
Interest expense 763 1,086
Interest income (4,046) (3,971)
Equity loss in affiliates 4,960 1,640
Income tax (benefit) expense (11,437) 14,165
Net (loss) income (33,947) 126,995
Operating Segments | Met    
Segment Reporting Information [Line Items]    
Coal revenues 529,667 861,283
Other revenues 2,290 2,789
Total revenues 531,957 864,072
Non-GAAP Cost of coal sales 414,669 504,814
Freight and handling costs 83,924 133,724
Idled and closed mine costs 5,991 9,775
Cost of coal sales (exclusive of items shown separately below) 504,584 648,313
Depreciation, depletion and amortization 43,910 40,701
Accretion on asset retirement obligations 5,614 6,143
Amortization of acquired intangibles 1,357 1,675
Selling, general and administrative expenses 15,424 22,377
Interest expense 763 1,086
Interest income (4,046) (3,971)
Equity loss in affiliates 4,960 1,640
Other segment items 4,775 4,948
Income tax (benefit) expense (11,437) 14,165
Total other expenses 61,320 88,764
Net (loss) income $ (33,947) $ 126,995