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Revenue - Disaggregation of Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 861,283	$ 906,698
Coal
Disaggregation of Revenue [Line Items]
Revenues	861,283	906,698
Coal | Export
Disaggregation of Revenue [Line Items]
Revenues	701,301	678,131
Coal | Domestic
Disaggregation of Revenue [Line Items]
Revenues	159,982	228,567
Coal, Met
Disaggregation of Revenue [Line Items]
Revenues	826,034	857,979
Coal, Met | Export
Disaggregation of Revenue [Line Items]
Revenues	672,739	647,932
Coal, Met | Domestic
Disaggregation of Revenue [Line Items]
Revenues	153,295	210,047
Coal, Thermal
Disaggregation of Revenue [Line Items]
Revenues	35,249	48,719
Coal, Thermal | Export
Disaggregation of Revenue [Line Items]
Revenues	28,562	30,199
Coal, Thermal | Domestic
Disaggregation of Revenue [Line Items]
Revenues	$ 6,687	$ 18,520

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