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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (41,886) $ (22,931)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Deferred income taxes 572 359
Loss on sale of oil and gas properties 28,600  
Depreciation, depletion and amortization 27,152 29,905
Gain on derivative financial instruments (2,602) (7,860)
Cash settlements of derivative financial instruments 1,404 505
Amortization of debt discount, premium and issuance costs 11,056 5,435
Interest paid in-kind 9,845 9,240
Stock-based compensation 1,601 1,265
Decrease (increase) in accounts receivable 1,455 (2,048)
Decrease in other current assets 472 362
Decrease in accounts payable and accrued expenses (16,113) (11,025)
Net cash provided by operating activities 21,556 3,207
CASH FLOWS FROM INVESTING ACTIVITIES:    
Capital expenditures (46,458) (38,401)
Net cash used for investing activities (46,458) (38,401)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings under bank credit facility 15,000  
Common stock warrants exercised   1
Income taxes related to equity awards (365) (271)
Net cash provided by (used for) financing activities 14,635 (270)
Net decrease in cash and cash equivalents (10,267) (35,464)
Cash and cash equivalents, beginning of period 61,255 65,904
Cash and cash equivalents, end of period $ 50,988 $ 30,440