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Revenue - Schedule of Disaggregation of Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 529,667	$ 861,283
Coal
Disaggregation of Revenue [Line Items]
Revenues	529,667	861,283
Coal | Export
Disaggregation of Revenue [Line Items]
Revenues	395,715	701,301
Coal | Domestic
Disaggregation of Revenue [Line Items]
Revenues	133,952	159,982
Coal, Met
Disaggregation of Revenue [Line Items]
Revenues	505,402	826,034
Coal, Met | Export
Disaggregation of Revenue [Line Items]
Revenues	376,740	672,739
Coal, Met | Domestic
Disaggregation of Revenue [Line Items]
Revenues	128,662	153,295
Coal, Thermal
Disaggregation of Revenue [Line Items]
Revenues	24,265	35,249
Coal, Thermal | Export
Disaggregation of Revenue [Line Items]
Revenues	18,975	28,562
Coal, Thermal | Domestic
Disaggregation of Revenue [Line Items]
Revenues	$ 5,290	$ 6,687

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