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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income (loss) $ (18,872) $ 209,529
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depletion, depreciation and accretion 32,087 64,848
(Gain) loss on sale of oil and natural gas properties 5,904 (235,690)
Stock-based compensation, net 7,818 21,290
Unrealized loss (gain) on derivative contracts 26,761 (42,219)
Amortization of deferred loan costs 651 896
Amortization of discount and premium 183 1,887
Loss (gain) on extinguishment of debt   56,898
Accrued settlements on derivative contracts 1,588 (3,520)
Other income (expense) (1,479) (1,004)
Change in assets and liabilities:    
Accounts receivable 331 34,982
Prepaids and other (1,612) 91
Accounts payable and accrued liabilities (9,782) 14,655
Net cash provided by (used in) operating activities 43,578 122,643
Cash flows from investing activities:    
Oil and natural gas capital expenditures (251,961) (121,210)
Proceeds received from sale of oil and natural gas properties 1,779 477,306
Acquisition of oil and natural gas properties (332,901) (907,487)
Acquisition of other operating property and equipment   (25,538)
Other operating property and equipment capital expenditures (53,242) (13,735)
Proceeds received from sale of other operating property and equipment 1,899 10,352
Funds held in escrow and other 155 285
Net cash provided by (used in) investing activities (634,271) (580,027)
Cash flows from financing activities:    
Proceeds from borrowings 206,000 1,235,000
Repayments of borrowings   (1,118,000)
Cash payments to Noteholders   (30,917)
Debt issuance costs (4,005) (16,823)
Preferred stock issued   400,055
Common stock issued 63,480  
Offering costs and other (2,983) (11,934)
Net cash provided by (used in) financing activities 262,492 457,381
Net increase (decrease) in cash and cash equivalents (328,201) (3)
Cash and cash equivalents at beginning of period 424,071 24
Cash and cash equivalents at end of period 95,870 21
Disclosure of non-cash investing and financing activities:    
Asset retirement obligations $ 2,047 (5,972)
Accretion of non-cash preferred dividend   $ 48,007