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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 09, 2016
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:        
Net income (loss) $ (479,193)   $ 45,959 $ 535,686
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Depletion, depreciation and accretion 46,899   77,527 110,207
Full cost ceiling impairment 420,934      
(Gain) loss on sale of oil and natural gas properties     7,235 (721,573)
Gain on sale of oil and natural gas assets     (119,003)  
Deferred income tax provision (benefit)     95,791  
Stock-based compensation, net 21,519   15,266 36,757
Unrealized loss (gain) on derivative contracts 112,449   (84,274) 16,468
Amortization and write-off of deferred loan costs     1,405 1,795
Amortization of discount and premium 2,506   288 2,597
Reorganization items (15,963)     (739)
Loss (gain) on extinguishment of debt       114,931
Accrued settlements on derivative contracts (18,498)   10 24
Other expense (income) 79   (1,618) (3,355)
Change in assets and liabilities:        
Accounts receivable (20,459)   378 103,166
Prepaids and other 857   5,840 (3,688)
Accounts payable and accrued liabilities 32,006   22,351 (77,685)
Net cash provided by (used in) operating activities 103,136   67,155 114,591
Cash flows from investing activities:        
Oil and natural gas capital expenditures (61,389)   (475,685) (331,257)
Proceeds received from sales of oil and natural gas assets 888   3,816 2,003,894
Acquisition of oil and natural gas properties (70)   (333,857) (1,018,546)
Acquisition of other operating property and equipment       (25,538)
Other operating property and equipment capital expenditures (750)   (116,995) (53,214)
Proceeds received from sale of other operating property and equipment     216,083 21,798
Funds held in escrow and other (1,721)   153 1,455
Net cash provided by (used in) investing activities (63,042)   (706,485) 598,592
Cash flows from financing activities:        
Proceeds from borrowings 115,000   438,000 1,349,000
Repayments of borrowings (159,000)   (232,000) (1,922,826)
Cash payments to Noteholders and Preferred Holders (10,013)     (83,653)
Debt issuance costs     (4,334) (17,799)
Preferred stock issued       400,055
Common stock issued     63,480  
Offering costs and other     (3,021) (13,913)
Net cash provided by (used in) financing activities (54,013)   262,125 (289,136)
Net increase (decrease) in cash and cash equivalents (13,919)   (377,205) 424,047
Cash and cash equivalents at beginning of period 13,943   424,071 24
Cash and cash equivalents at end of period 24 $ 13,943 46,866 424,071
Supplemental cash flow information:        
Cash paid for interest, net of capitalized interest 3,605   37,526 90,835
Cash paid (refunded) for income taxes 5,000   (5,000) 1,250
Cash paid for reorganization items 18,012     739
Disclosure of non-cash investing and financing activities:        
Asset retirement obligations 513   2,217 (29,313)
Accretion of non-cash preferred dividend       48,007
Preferred dividends on redeemable noncontrolling interest paid-in-kind 791      
Accrued debt issuance costs     $ (90) $ 90
Predecessor        
Cash flows from operating activities:        
Net income (loss)   11,958    
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Depletion, depreciation and accretion   120,555    
Full cost ceiling impairment   754,769    
Other operating property and equipment impairment   28,056    
Stock-based compensation, net   4,876    
Unrealized loss (gain) on derivative contracts   263,732    
Amortization and write-off of deferred loan costs   6,371    
Amortization of discount and premium   1,515    
Reorganization items   (929,084)    
Loss (gain) on extinguishment of debt   (81,434)    
Other expense (income)   (4,233)    
Change in assets and liabilities:        
Accounts receivable   47,920    
Prepaids and other   (4,329)    
Accounts payable and accrued liabilities   (45,324)    
Net cash provided by (used in) operating activities   175,348    
Cash flows from investing activities:        
Oil and natural gas capital expenditures   (226,741)    
Proceeds received from sales of oil and natural gas assets   (407)    
Acquisition of oil and natural gas properties   124    
Other operating property and equipment capital expenditures   (950)    
Proceeds received from sale of other operating property and equipment   138    
Funds held in escrow and other   62    
Net cash provided by (used in) investing activities   (227,774)    
Cash flows from financing activities:        
Proceeds from borrowings   886,000    
Repayments of borrowings   (727,648)    
Cash payments to Noteholders and Preferred Holders   (97,521)    
Debt issuance costs   (1,977)    
Offering costs and other   (511)    
Net cash provided by (used in) financing activities   58,343    
Net increase (decrease) in cash and cash equivalents   5,917    
Cash and cash equivalents at beginning of period $ 13,943 8,026    
Cash and cash equivalents at end of period   13,943    
Supplemental cash flow information:        
Cash paid for interest, net of capitalized interest   139,930    
Cash paid for reorganization items   15,362    
Disclosure of non-cash investing and financing activities:        
Accrued capitalized interest   (23,966)    
Asset retirement obligations   939    
Preferred dividends on redeemable noncontrolling interest paid-in-kind   9,329    
Accretion of redeemable noncontrolling interest   26,576    
Accrued debt issuance costs   $ 1,176