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Summary of Significant Accounting Policies - Revenue Recognition (Details) t in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) t	Jun. 30, 2021 USD ($)
Concentration Risk [Line Items]
Percent of total production transferred for title and marketing			10.00%
Maximum total production transferred for title and marketing (in tons) | t			250
Other revenues	$ 625,156	$ 227,440	$ 1,003,808	$ 441,204
XCoal | Customer Concentration Risk | Revenue
Concentration Risk [Line Items]
Other revenues	$ 128,000	$ 141,800	$ 211,500	$ 248,100
Concentration risk, percentage	20.30%	63.10%	20.80%	57.30%

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