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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income (loss) $ (336,559) $ (2,598)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depletion, depreciation and accretion 29,975 15,991
Full cost ceiling impairment 275,239  
(Gain) loss on sale of oil and natural gas properties   3,679
(Gain) loss on sale of Water Assets 885  
Deferred income tax provision (benefit) (45,485)  
Stock-based compensation, net (6,782) 3,581
Unrealized loss (gain) on derivative contracts 68,169 (11,113)
Amortization of deferred loan costs 404 292
Amortization of discount and premium 55 132
Other income (expense) 1,408 106
Change in assets and liabilities:    
Accounts receivable (3,414) (5,213)
Prepaids and other (2,876) 108
Accounts payable and accrued liabilities (17,853) (17,547)
Net cash provided by (used in) operating activities (36,834) (12,582)
Cash flows from investing activities:    
Oil and natural gas capital expenditures (81,068) (127,885)
Proceeds received from sales of oil and natural gas properties   (4,034)
Acquisition of oil and natural gas properties (2,809) (132,464)
Other operating property and equipment capital expenditures (30,553) (30,721)
Proceeds received from sale of other operating property and equipment   1,899
Funds held in escrow and other (1) 157
Net cash provided by (used in) investing activities (114,431) (293,048)
Cash flows from financing activities:    
Proceeds from borrowings 124,000 206,000
Repayments of borrowings (19,000)  
Debt issuance costs   (3,371)
Common stock issued   63,480
Offering costs and other (406) (2,475)
Net cash provided by (used in) financing activities 104,594 263,634
Net increase (decrease) in cash and cash equivalents (46,671) (41,996)
Cash and cash equivalents at beginning of period 46,866 424,071
Cash and cash equivalents at end of period 195 382,075
Disclosure of non-cash investing and financing activities:    
Asset retirement obligations $ (43) $ 210