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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (75,889) $ (44,373)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Deferred income taxes 426 855
Loss on sale of oil and gas properties 35,438  
Depreciation, depletion and amortization 53,950 60,226
Gain on derivative financial instruments (964) (13,155)
Cash settlements of derivative financial instruments 2,512 1,896
Amortization of debt discount, premium and issuance costs 23,267 15,000
Interest paid in-kind 20,014 18,594
Stock-based compensation 3,109 2,815
Increase in accounts receivable (717) (9,657)
Decrease (increase) in other current assets 641 (908)
Increase in accounts payable and accrued expenses 25,211 24,222
Net cash provided by operating activities 86,998 55,515
CASH FLOWS FROM INVESTING ACTIVITIES:    
Capital expenditures (90,555) (85,829)
Deposits on property acquisitions (2,139)  
Proceeds from sale of oil and gas properties 103,593  
Net cash provided by (used for) investing activities 10,899 (85,829)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings under bank credit facility 49,679  
Repayments under bank credit facility (49,679)  
Common stock warrants exercised   2
Debt issuance costs (405)  
Income taxes related to equity awards (369) (271)
Net cash used for financing activities (774) (269)
Net increase (decrease) in cash and cash equivalents 97,123 (30,583)
Cash and cash equivalents, beginning of period 61,255 65,904
Cash and cash equivalents, end of period $ 158,378 $ 35,321