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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net income (loss) $ 40,393 $ (154,386)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation, depletion and amortization 251,957 244,937
Gain on extinguishment of debt 0 (18,658)
Loss on sale of properties 0 1,311
Impairment 5,882 3,585
Deferred income taxes 18,376 (80,127)
Derivative instruments (106,607) 76,471
Stock-based compensation expenses 13,823 12,979
Deferred financing costs amortization and other 8,871 6,552
Working capital and other changes:    
Change in accounts receivable (13,743) 4,297
Change in inventory (1,007) 2,054
Change in prepaid expenses (264) 1,423
Change in other current assets 280 (114)
Change in long-term inventory and other assets (8,768) 100
Change in accounts payable, interest payable and accrued liabilities 11,158 (18,034)
Change in other current liabilities (10,490) 9,001
Change in other liabilities 0 10
Net cash provided by operating activities 209,861 91,401
Cash flows from investing activities:    
Capital expenditures (252,461) (231,341)
Proceeds from sale of properties 4,000 11,679
Costs related to sale of properties 0 (310)
Derivative settlements (8,899) 103,790
Advances from joint interest partners (1,781) 769
Net cash used in investing activities (259,141) (115,413)
Cash flows from financing activities:    
Proceeds from revolving credit facility 484,000 359,000
Principal payments on revolving credit facility (429,000) (462,000)
Repurchase of senior unsecured notes 0 (56,925)
Deferred financing costs 0 (751)
Proceeds from sale of common stock 0 182,953
Purchases of treasury stock (5,451) (1,520)
Other (55) 0
Net cash provided by financing activities 49,494 20,757
Increase (decrease) in cash and cash equivalents 214 (3,255)
Cash and cash equivalents:    
Beginning of period 11,226 9,730
End of period 11,440 6,475
Supplemental non-cash transactions:    
Change in accrued capital expenditures 19,017 (17,015)
Change in asset retirement obligations 1,759 (8,785)
Notes payable from acquisition $ 4,875 $ 0