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Summary of Significant Accounting Policies - Revenue Recognition (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) t	Sep. 30, 2020 USD ($)
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			250,000
Other revenues	$ 202,467	$ 180,064	$ 643,671	$ 570,485
XCoal | Customer Concentration Risk | Revenue
Concentration Risk [Line Items]
Other revenues	$ 122,300	$ 38,700	$ 370,400	$ 82,300
Concentration risk, percentage	61.10%	22.10%	58.50%	14.80%

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