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Segment Information (Reconciliation of Segment Income from Operations to Consolidated Income Before Income Taxes) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Oct. 01, 2016
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]                        
Income before income taxes                 $ 34,605   $ 260,101 $ 203,195
Interest expense, net                 10,754   13,689 24,256
Depreciation, depletion and amortization                 32,604   119,563 122,464
Accretion on asset retirement obligations                 7,634   27,970 30,209
Amortization of sales contracts, net                 796   11,107 53,985
Asset impairment and mine closure costs                 0   0 0
Gain on sale of Lone Mountain Processing, Inc.                 0   0 (21,297)
Net loss resulting from early retirement of debt and debt restructuring                 0   485 2,547
Non-service related postretirement benefit costs                 (32)   3,202 1,940
Reorganization items, net $ 60 $ 560 $ 740 $ 301 $ (494) $ 43 $ 21 $ 2,828 759   1,661 2,398
Fresh start coal inventory fair value adjustment                 7,345   0 0
Adjusted EBITDAR                 $ 94,465   $ 437,778 $ 419,697
Predecessor                        
Segment Reporting Information [Line Items]                        
Income before income taxes                   $ 1,237,455    
Interest expense, net                   133,235    
Depreciation, depletion and amortization                   191,581    
Accretion on asset retirement obligations                   24,321    
Amortization of sales contracts, net                   (728)    
Asset impairment and mine closure costs                   129,267    
Gain on sale of Lone Mountain Processing, Inc.                   0    
Net loss resulting from early retirement of debt and debt restructuring                   2,213    
Non-service related postretirement benefit costs                   1,715    
Reorganization items, net                   (1,630,041)    
Fresh start coal inventory fair value adjustment                   0    
Adjusted EBITDAR                   $ 89,018