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Segment Information - Reconciliation of Net Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue from External Customer [Line Items]        
Segment Adjusted EBITDA $ 107,772 $ 23,859 $ 232,405 $ 121,949
Other revenues 202,467 180,064 643,671 570,485
Cost of other revenues (6,654) (7,064) (22,792) (22,267)
Depreciation and depletion (28,967) (27,965) (102,021) (78,813)
Selling, general and administrative (7,430) (8,192) (26,182) (25,105)
Business interruption (6,872) 0 (13,892) 0
Idle mine (9,327) 0 (20,203) 0
Other income 1,400 0 1,291 1,822
Interest expense, net (8,784) (8,059) (25,954) (23,847)
Income tax (expense) benefit (5,433) 8,152 (22,439) 9,336
Net income (loss) 38,427 (14,434) 12,391 (2,050)
Other revenues        
Revenue from External Customer [Line Items]        
Other revenues $ 2,722 $ 4,835 $ 12,178 $ 14,875