v3.25.2
Segment Information - Schedule of Reconciliations of Segment Information to Consolidated Amounts (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Total revenues $ 297,523 $ 396,524 $ 597,466 $ 900,036  
Operating income (loss) 7,723 70,904 (9,661) 219,982  
Transportation and royalties 75,067 102,794 157,684 215,880  
Depreciation and depletion 43,255 38,150 88,532 78,173  
Assets 2,645,402 2,560,857 2,645,402 2,560,857 $ 2,591,516
Capital expenditures 74,966 110,961 143,476 210,664  
All other          
Segment Reporting Information [Line Items]          
Total revenues 9,032 6,099 14,042 11,613  
Transportation and royalties 0 0 0 0  
Depreciation and depletion 2,241 2,086 4,527 4,092  
Assets 357,283 129,419 357,283 129,419  
Capital expenditures 1,138 1,839 2,230 3,752  
Mining          
Segment Reporting Information [Line Items]          
Depreciation and depletion 43,255 38,150 88,532 78,173  
Mining | Operating Segments          
Segment Reporting Information [Line Items]          
Total revenues 288,491 390,424 583,424 888,423  
Cash cost of sales (exclusive of depreciation and depletion) 224,504 259,690 468,532 543,862  
Other segment items 1,908 1,614 3,615 3,030  
Operating income (loss) 62,079 129,120 111,277 341,531  
Transportation and royalties 75,067 102,794 157,684 215,880  
Depreciation and depletion 41,014 36,064 84,005 74,081  
Assets 2,288,119 2,431,438 2,288,119 2,431,438  
Capital expenditures $ 73,828 $ 109,122 $ 141,246 $ 206,912