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Segment Information - Reconciliation of Net Income (Loss) (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2016
Sep. 30, 2017
Successor          
Segment Reporting Information [Line Items]          
Segment Adjusted EBITDA $ 113,394,000 $ (7,392,000)   $ (25,843,000) $ 439,942,000
Other revenues 8,997,000 8,496,000   14,555,000 33,487,000
Cost of other revenues (6,985,000) (6,998,000)   (12,124,000) (22,959,000)
Depreciation and depletion (23,393,000) (22,538,000)   (38,359,000) (57,625,000)
Selling, general and administrative (9,243,000) (4,516,000)   (10,331,000) (23,073,000)
Other postretirement benefits 0 0   0 0
Restructuring charges 0 0   0 0
Transaction and other costs 0 0   (10,475,000) (12,873,000)
Interest (expense), net (640,000) (694,000)   (1,128,000) (1,890,000)
Reorganization items, net 0 0   0 0
Income tax benefit (expense) 37,587,000 0   0 2,881,000
Net income (loss) $ 119,717,000 $ (33,642,000)   $ (83,705,000) $ 357,890,000
Predecessor          
Segment Reporting Information [Line Items]          
Segment Adjusted EBITDA     $ (7,143,000)    
Other revenues     6,229,000    
Cost of other revenues     (4,698,000)    
Depreciation and depletion     (28,958,000)    
Selling, general and administrative     (9,008,000)    
Other postretirement benefits     (6,160,000)    
Restructuring charges     (3,418,000)    
Transaction and other costs     0    
Interest (expense), net     (16,562,000)    
Reorganization items, net     7,920,000    
Income tax benefit (expense)     (18,000)    
Net income (loss)     $ (61,816,000)