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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Oct. 01, 2016
Dec. 31, 2018
Dec. 31, 2017
Successor        
Net (loss) income $ (333,982)   $ (9,075) $ 47,062
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities        
Provision for doubtful accounts (13,166)   (462) 406
Depreciation, depletion and amortization 39,983   139,263 131,887
Impairment 319,087   4,170 4,019
Gain on reorganization items, net 0   0 0
Debt issuance costs amortization 0   470 430
Amortization of discount, net of premium, on debt (81)   (47) (330)
Gain on extinguishment of debt 0   (1,151) 0
Gain on debt derivatives 0   0 0
Cash paid for early conversion of convertible notes 0   0 0
Loss (gain) on derivative contracts 25,652   17,155 (24,090)
Cash (paid) received on settlement of derivative contracts 7,698   (35,325) 7,260
Loss on settlement of contract 0   0 0
Cash paid on settlement of contract 0   0 0
Stock-based compensation 6,250   23,377 15,750
Other 717   (1,571) 344
Changes in operating assets and liabilities increasing (decreasing) cash        
Deconsolidation of noncontrolling interest 0   0 0
Receivables 12,872   16,560 115
Prepaid expenses (1,079)   2,620 127
Other current assets (260)   170 191
Other assets and liabilities, net 1,505   (1,754) 4,186
Accounts payable and accrued expenses 990   (4,257) (2,199)
Asset retirement obligations (591)   (4,629) (3,979)
Net cash provided by (used in) operating activities 65,595   145,514 181,179
CASH FLOWS FROM INVESTING ACTIVITIES        
Capital expenditures for property, plant and equipment (51,676)   (187,047) (219,246)
Acquisitions of assets 0   (24,764) (48,312)
Proceeds from sale of assets 11,841   28,358 21,834
Net cash used in investing activities (39,835)   (183,453) (245,724)
CASH FLOWS FROM FINANCING ACTIVITIES        
Proceeds from borrowings 0   10,000 0
Repayments of borrowings (414,954)   (46,304) 0
Debt issuance costs 0   0 (1,488)
Proceeds from building mortgage 0   0 0
Payment of mortgage proceeds and cash recovery to debt holders 0   0 0
Cash paid for tax withholdings on vested stock awards (110)   (7,420) (6,730)
Other 3   0 0
Net cash (used in) provided by financing activities (415,061)   (43,724) (8,218)
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS and RESTRICTED CASH (389,301)   (81,663) (72,763)
CASH, CASH EQUIVALENTS and RESTRICTED CASH, beginning of year 563,372   101,308 174,071
CASH, CASH EQUIVALENTS and RESTRICTED CASH, end of year 174,071 $ 563,372 $ 19,645 $ 101,308
Predecessor        
Net (loss) income   1,440,797    
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities        
Provision for doubtful accounts   16,704    
Depreciation, depletion and amortization   112,301    
Impairment   718,194    
Gain on reorganization items, net   (2,442,436)    
Debt issuance costs amortization   4,996    
Amortization of discount, net of premium, on debt   2,734    
Gain on extinguishment of debt   (41,179)    
Gain on debt derivatives   (1,324)    
Cash paid for early conversion of convertible notes   (33,452)    
Loss (gain) on derivative contracts   4,823    
Cash (paid) received on settlement of derivative contracts   72,608    
Loss on settlement of contract   90,184    
Cash paid on settlement of contract   (11,000)    
Stock-based compensation   9,075    
Other   (3,260)    
Changes in operating assets and liabilities increasing (decreasing) cash        
Deconsolidation of noncontrolling interest   (9,654)    
Receivables   36,116    
Prepaid expenses   (5,681)    
Other current assets   (181)    
Other assets and liabilities, net   (7,542)    
Accounts payable and accrued expenses   (3,595)    
Asset retirement obligations   (61,305)    
Net cash provided by (used in) operating activities   (112,077)    
CASH FLOWS FROM INVESTING ACTIVITIES        
Capital expenditures for property, plant and equipment   (186,452)    
Acquisitions of assets   (1,328)    
Proceeds from sale of assets   20,090    
Net cash used in investing activities   (167,690)    
CASH FLOWS FROM FINANCING ACTIVITIES        
Proceeds from borrowings   489,198    
Repayments of borrowings   (74,243)    
Debt issuance costs   (333)    
Proceeds from building mortgage   26,847    
Payment of mortgage proceeds and cash recovery to debt holders   (33,874)    
Cash paid for tax withholdings on vested stock awards   (44)    
Other   0    
Net cash (used in) provided by financing activities   407,551    
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS and RESTRICTED CASH   127,784    
CASH, CASH EQUIVALENTS and RESTRICTED CASH, beginning of year $ 563,372 435,588    
CASH, CASH EQUIVALENTS and RESTRICTED CASH, end of year   $ 563,372