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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, 2017
Dec. 31, 2015
Successor        
Net income (loss) $ (333,982)   $ 47,062  
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities        
Provision for doubtful accounts (13,166)   406  
Depreciation, depletion and amortization 39,983   131,887  
Impairment 319,087   4,019  
Gain on reorganization items, net 0   0  
Debt issuance costs amortization 0   430  
Amortization of discount, net of premium, on debt (81)   (330)  
Gain on extinguishment of debt 0   0  
Write off of debt issuance costs 0   0  
(Gain) loss on debt derivatives 0   0  
Cash paid for early conversion of convertible notes 0   0  
(Gain) loss on derivative contracts 25,652   (24,090)  
Cash received on settlement of derivative contracts 7,698   7,260  
Loss on settlement of contract 0   0  
Cash paid on settlement of contract 0   0  
Stock-based compensation 6,250   15,750  
Other 717   344  
Changes in operating assets and liabilities increasing (decreasing) cash        
Deconsolidation of noncontrolling interest 0   0  
Receivables 12,872   115  
Prepaid expenses (1,079)   127  
Other current assets (260)   191  
Other assets and liabilities, net 1,505   4,186  
Accounts payable and accrued expenses 990   (2,199)  
Asset retirement obligations (591)   (3,979)  
Net cash provided by (used in) operating activities 65,595   181,179  
CASH FLOWS FROM INVESTING ACTIVITIES        
Capital expenditures for property, plant and equipment (51,676)   (219,246)  
Acquisitions of assets 0   (48,312)  
Proceeds from sale of assets 11,841   21,834  
Net cash used in investing activities (39,835)   (245,724)  
CASH FLOWS FROM FINANCING ACTIVITIES        
Proceeds from borrowings 0   0  
Repayments of borrowings (414,954)   0  
Debt issuance costs 0   (1,488)  
Proceeds from building mortgage 0   0  
Payment of mortgage proceeds and cash recovery to debt holders 0   0  
Noncontrolling interest distributions 0   0  
Cash paid for tax withholdings on vested stock awards (110)   (6,730)  
Dividends paid—preferred 0   0  
Other 3   0  
Net cash (used in) provided by financing activities (415,061)   (8,218)  
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS and RESTRICTED CASH (389,301)   (72,763)  
CASH, CASH EQUIVALENTS and RESTRICTED CASH, beginning of year 563,372   174,071  
CASH, CASH EQUIVALENTS and RESTRICTED CASH, end of year 174,071 $ 563,372 $ 101,308  
Predecessor        
Net income (loss)   1,440,797   $ (4,321,051)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities        
Provision for doubtful accounts   16,704   0
Depreciation, depletion and amortization   112,301   371,772
Impairment   718,194   4,534,689
Gain on reorganization items, net   (2,442,436)   0
Debt issuance costs amortization   4,996   11,884
Amortization of discount, net of premium, on debt   2,734   3,130
Gain on extinguishment of debt   (41,179)   (641,131)
Write off of debt issuance costs   0   7,108
(Gain) loss on debt derivatives   (1,324)   10,377
Cash paid for early conversion of convertible notes   (33,452)   (32,741)
(Gain) loss on derivative contracts   4,823   (73,061)
Cash received on settlement of derivative contracts   72,608   327,702
Loss on settlement of contract   90,184   50,976
Cash paid on settlement of contract   (11,000)   (24,889)
Stock-based compensation   9,075   18,380
Other   (3,260)   2,842
Changes in operating assets and liabilities increasing (decreasing) cash        
Deconsolidation of noncontrolling interest   (9,654)   0
Receivables   36,116   201,907
Prepaid expenses   (5,681)   1,148
Other current assets   (181)   12,710
Other assets and liabilities, net   (7,542)   2,239
Accounts payable and accrued expenses   (3,595)   (86,470)
Asset retirement obligations   (61,305)   (3,984)
Net cash provided by (used in) operating activities   (112,077)   373,537
CASH FLOWS FROM INVESTING ACTIVITIES        
Capital expenditures for property, plant and equipment   (186,452)   (879,201)
Acquisitions of assets   (1,328)   (216,943)
Proceeds from sale of assets   20,090   56,504
Net cash used in investing activities   (167,690)   (1,039,640)
CASH FLOWS FROM FINANCING ACTIVITIES        
Proceeds from borrowings   489,198   2,065,000
Repayments of borrowings   (74,243)   (939,466)
Debt issuance costs   (333)   (53,244)
Proceeds from building mortgage   26,847   0
Payment of mortgage proceeds and cash recovery to debt holders   (33,874)   0
Noncontrolling interest distributions   0   (138,305)
Cash paid for tax withholdings on vested stock awards   (44)   (3,535)
Dividends paid—preferred   0   (11,262)
Other   0   1,250
Net cash (used in) provided by financing activities   407,551   920,438
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS and RESTRICTED CASH   127,784   254,335
CASH, CASH EQUIVALENTS and RESTRICTED CASH, beginning of year $ 563,372 435,588   181,253
CASH, CASH EQUIVALENTS and RESTRICTED CASH, end of year   $ 563,372   $ 435,588