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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income (loss) $ (100,709) $ 628,816
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depletion, depreciation and accretion 52,397 100,788
(Gain) loss on sale of oil and natural gas properties 7,235 (727,520)
Stock-based compensation, net 12,241 33,548
Unrealized loss (gain) on derivative contracts 77,524 (11,010)
Amortization of deferred loan costs 1,022 1,306
Amortization of discount and premium 235 2,358
Loss (gain) on extinguishment of debt   86,065
Accrued settlements on derivative contracts 3,292 (673)
Other income (expense) (1,978) (4,132)
Change in assets and liabilities:    
Accounts receivable (7,498) 37,950
Prepaids and other (341) (5,231)
Accounts payable and accrued liabilities (6,711) (40,043)
Net cash provided by (used in) operating activities 36,709 102,222
Cash flows from investing activities:    
Oil and natural gas capital expenditures (369,304) (218,880)
Proceeds received from sale of oil and natural gas properties 1,647 1,901,578
Acquisition of oil and natural gas properties (333,470) (916,676)
Acquisition of other operating property and equipment   (25,538)
Other operating property and equipment capital expenditures (79,389) (25,474)
Proceeds received from sale of other operating property and equipment 2,236 21,291
Funds held in escrow and other 153 1,459
Net cash provided by (used in) investing activities (778,127) 737,760
Cash flows from financing activities:    
Proceeds from borrowings 293,000 1,349,000
Repayments of borrowings (32,000) (1,497,826)
Cash payments to Noteholders   (70,903)
Debt issuance costs (4,013) (17,220)
Preferred stock issued   400,055
Common stock issued 63,480  
Offering costs and other (2,983) (13,765)
Net cash provided by (used in) financing activities 317,484 149,341
Net increase (decrease) in cash and cash equivalents (423,934) 989,323
Cash and cash equivalents at beginning of period 424,071 24
Cash and cash equivalents at end of period 137 989,347
Disclosure of non-cash investing and financing activities:    
Asset retirement obligations $ 2,519 (28,481)
Accretion of non-cash preferred dividend   $ 48,007