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Segment Information - Reconciliation of Net Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue from External Customer [Line Items]        
Segment Adjusted EBITDA $ 71,994 $ 28,266 $ 124,633 $ 98,090
Other revenues 227,440 163,701 441,204 390,421
Cost of other revenues (8,343) (7,642) (16,138) (15,203)
Depreciation and depletion (40,151) (22,156) (73,054) (50,848)
Selling, general and administrative (11,115) (8,457) (18,752) (16,913)
Business interruption (7,020) 0 (7,020) 0
Idle mine (10,876) 0 (10,876) 0
Other income (expense) 0 0 (109) 1,822
Interest expense, net (8,477) (8,255) (17,170) (15,788)
Income tax benefit (expense) 6,626 4,425 (17,006) 1,184
Net (loss) income (4,681) (9,161) (26,036) 12,384
Other revenues        
Revenue from External Customer [Line Items]        
Other revenues $ 2,681 $ 4,658 $ 9,456 $ 10,040