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Segment Information (Reconciliation Segment Income To 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
Segment Information        
Net income $ 407,563 $ 27,866 $ 679,435 $ 21,824
Provision for income taxes 496 2,006 951 2,383
Interest expense, net 4,610 2,794 11,633 6,595
Depreciation, depletion and amortization 32,780 27,884 64,990 53,681
Accretion on asset retirement obligation 4,430 5,437 8,860 10,874
Non-service related pension and postretirement benefit costs 459 539 1,332 2,066
Net loss resulting from early retirement of debt 9,629   13,749  
Adjusted EBITDA 459,967 66,526 780,950 97,423
EBITDA from idled or otherwise disposed operations 3,957 3,997 6,348 7,563
Selling, general and administrative expenses 26,516 24,119 53,164 45,599
Other (678) 8,376 8,804 7,111
Segment Adjusted EBITDA from coal operations $ 489,762 $ 103,018 $ 849,266 $ 157,696