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Segment Information - Reconciliation of Net Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenue $ 1,525,220 $ 1,676,625 $ 1,738,738
Cost of other revenues (45,449) (37,486) (27,047)
Depreciation and depletion (153,982) (127,356) (115,279)
Selling, general and administrative (63,078) (51,817) (48,791)
Business interruption (524) (8,291) (23,455)
Idle mine 0 0 (12,137)
Loss on early extinguishment of debt 0 (11,699) 0
Other (expense) income 0 (1,027) 675
Interest income 33,047 40,699 12,438
Interest expense (4,271) (17,960) (31,433)
Income before income tax expense 283,666 551,419 783,104
Income tax expense (33,063) (72,790) (141,806)
Net income 250,603 478,629 641,298
Other revenues      
Segment Reporting Information [Line Items]      
Revenue 25,240 28,633 31,159
Mining      
Segment Reporting Information [Line Items]      
Segment Adjusted EBITDA 492,683 737,723 996,974
Revenue 1,499,980 1,647,992 1,707,579
Cost of other revenues (45,449) (37,486) (27,047)
Depreciation and depletion (153,982) (127,356) (115,279)
Selling, general and administrative (63,078) (51,817) (48,791)
Business interruption (524) (8,291) (23,455)
Idle mine 0 0 (12,137)
Loss on early extinguishment of debt 0 (11,699) 0
Other (expense) income 0 (1,027) 675
Interest income 33,047 40,699 12,438
Interest expense (4,271) (17,960) (31,433)
Income before income tax expense 283,666 551,419 783,104
Income tax expense (33,063) (72,790) (141,806)
Net income 250,603 478,629 641,298
Mining | Other revenues      
Segment Reporting Information [Line Items]      
Revenue $ 25,240 $ 28,633 $ 31,159