Revenue - Schedule of Disaggregation of Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 800,130	$ 853,807	$ 1,661,413	$ 1,760,505
Coal
Disaggregation of Revenue [Line Items]
Revenues	800,130	853,807	1,661,413	1,760,505
Coal | Export
Disaggregation of Revenue [Line Items]
Revenues	646,860	616,572	1,348,161	1,294,703
Coal | Domestic
Disaggregation of Revenue [Line Items]
Revenues	153,270	237,235	313,252	465,802
Coal, Met
Disaggregation of Revenue [Line Items]
Revenues	779,991	805,986	1,606,025	1,663,965
Coal, Met | Export
Disaggregation of Revenue [Line Items]
Revenues	634,176	580,328	1,306,915	1,228,260
Coal, Met | Domestic
Disaggregation of Revenue [Line Items]
Revenues	145,815	225,658	299,110	435,705
Coal, Thermal
Disaggregation of Revenue [Line Items]
Revenues	20,139	47,821	55,388	96,540
Coal, Thermal | Export
Disaggregation of Revenue [Line Items]
Revenues	12,684	36,244	41,246	66,443
Coal, Thermal | Domestic
Disaggregation of Revenue [Line Items]
Revenues	$ 7,455	$ 11,577	$ 14,142	$ 30,097