Revenue - Schedule of Disaggregation of Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 669,783	$ 738,998	$ 2,331,196	$ 2,499,503
Coal
Disaggregation of Revenue [Line Items]
Revenues	669,783	738,998	2,331,196	2,499,503
Coal | Export
Disaggregation of Revenue [Line Items]
Revenues	512,904	514,597	1,861,065	1,809,300
Coal | Domestic
Disaggregation of Revenue [Line Items]
Revenues	156,879	224,401	470,131	690,203
Coal, Met
Disaggregation of Revenue [Line Items]
Revenues	650,826	699,344	2,256,851	2,363,309
Coal, Met | Export
Disaggregation of Revenue [Line Items]
Revenues	501,173	485,955	1,808,088	1,714,215
Coal, Met | Domestic
Disaggregation of Revenue [Line Items]
Revenues	149,653	213,389	448,763	649,094
Coal, Thermal
Disaggregation of Revenue [Line Items]
Revenues	18,957	39,654	74,345	136,194
Coal, Thermal | Export
Disaggregation of Revenue [Line Items]
Revenues	11,731	28,642	52,977	95,085
Coal, Thermal | Domestic
Disaggregation of Revenue [Line Items]
Revenues	$ 7,226	$ 11,012	$ 21,368	$ 41,109