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Segment Information (Reconciliation Segment Income To Consolidated Income Before Income Taxes) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]        
Net income (loss) $ (49,324) $ 62,840 $ (74,623) $ 135,581
Provision for (benefit from) income taxes 1,206 91 (585) 161
Interest expense, net 1,730 2,287 3,859 4,576
Depreciation, depletion and amortization 30,167 26,535 61,475 51,873
Accretion on asset retirement obligations 4,986 5,137 9,992 10,274
Costs related to proposed joint venture with Peabody Energy 7,851 3,018 11,515 3,018
Severance costs related to voluntary separation plan 7,437   13,265  
Gain on property insurance recovery related to Mountain Laurel longwall 14,518   23,518  
Non-service related pension and postretirement benefit costs 1,102 1,336 2,198 3,102
Reorganization items, net   16 (26) (71)
Adjusted EBITDA (10,732) 105,564 2,183 212,818
Dal-Tex and Briar Branch Properties        
Segment Reporting Information [Line Items]        
(Gain) loss on divestitures $ (1,369) $ 4,304 $ (1,369) $ 4,304