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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net income (loss) $ (977,403) $ (18,872)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depletion, depreciation and accretion 70,400 32,087
Full cost ceiling impairment 939,622  
(Gain) loss on sale of oil and natural gas properties   5,904
(Gain) loss on sale of Water Assets 3,782  
Deferred income tax provision (benefit) (95,791)  
Stock-based compensation, net (5,757) 7,818
Unrealized loss (gain) on derivative contracts 57,405 26,761
Amortization and write-off of deferred loan costs 977 651
Amortization of discount and premium 111 183
Other income (expense) (35) 109
Change in assets and liabilities:    
Accounts receivable 5,874 331
Prepaids and other (6,547) (1,612)
Accounts payable and accrued liabilities (19,536) (9,782)
Net cash provided by (used in) operating activities (26,898) 43,578
Cash flows from investing activities:    
Oil and natural gas capital expenditures (139,160) (251,961)
Proceeds received from sale of oil and natural gas properties 1,247 1,779
Acquisition of oil and natural gas properties (2,809) (332,901)
Other operating property and equipment capital expenditures (64,576) (53,242)
Proceeds received from sale of other operating property and equipment   1,899
Funds held in escrow and other (5) 155
Net cash provided by (used in) investing activities (205,303) (634,271)
Cash flows from financing activities:    
Proceeds from borrowings 244,000 206,000
Repayments of borrowings (56,000)  
Debt issuance costs   (4,005)
Common stock issued   63,480
Offering costs and other (427) (2,983)
Net cash provided by (used in) financing activities 187,573 262,492
Net increase (decrease) in cash and cash equivalents (44,628) (328,201)
Cash and cash equivalents at beginning of period 46,866 424,071
Cash and cash equivalents at end of period 2,238 95,870
Disclosure of non-cash investing and financing activities:    
Asset retirement obligations $ (31) $ 2,047