Segment Information - Schedule of Operating Results and Capital Expenditures (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) mine segment plant	Mar. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	1
Total revenues	$ 911,235	$ 1,071,964
Depreciation, depletion and amortization	29,423	28,035
Amortization of acquired intangibles, net	2,197	5,748
Adjusted EBITDA	354,415	503,661
Capital expenditures	74,248	28,146
Operating Segments | Met
Segment Reporting Information [Line Items]
Total revenues	889,938	1,055,689
Depreciation, depletion and amortization	28,879	27,060
Amortization of acquired intangibles, net	2,197	4,796
Adjusted EBITDA	362,008	513,301
Capital expenditures	$ 71,614	27,297
Operating Segments | Met | Virginia
Segment Reporting Information [Line Items]
Number of active mines | mine	5
Number of preparation plants | plant	2
Operating Segments | Met | West Virginia
Segment Reporting Information [Line Items]
Number of active mines | mine	16
Number of preparation plants | plant	5
All Other
Segment Reporting Information [Line Items]
Total revenues	$ 21,297	16,275
Depreciation, depletion and amortization	544	975
Amortization of acquired intangibles, net	0	952
Adjusted EBITDA	(7,593)	(9,640)
Capital expenditures	$ 2,634	$ 849
All Other | West Virginia
Segment Reporting Information [Line Items]
Number of active mines | mine	1
Number of preparation plants | plant	1