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Segment Information - Reconciliation of Net Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Revenue from External Customer [Line Items]        
Segment Adjusted EBITDA $ 432,201 $ 71,994 $ 679,293 $ 124,633
Other revenues 625,156 227,440 1,003,808 441,204
Cost of other revenues (10,663) (8,343) (17,703) (16,138)
Depreciation and depletion (30,371) (40,151) (56,168) (73,054)
Selling, general and administrative (12,499) (11,115) (26,428) (18,752)
Business interruption (6,290) (7,020) (12,978) (7,020)
Idle mine (1,715) (10,876) (4,723) (10,876)
Other income (expense) 0 0 675 (109)
Interest expense, net (7,183) (8,477) (15,005) (17,170)
Income tax (expense) benefit (68,356) 6,626 (101,809) (17,006)
Net income (loss) 296,992 (4,681) 443,241 (26,036)
Other revenues        
Revenue from External Customer [Line Items]        
Other revenues $ 1,868 $ 2,681 $ (1,913) $ 9,456