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Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net loss $ (154,386) $ (71,271)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, depletion and amortization 244,937 237,696
Gain on extinguishment of debt (18,658) 0
Loss on sale of properties 1,311 0
Impairment 3,585 24,837
Deferred income taxes (80,127) (38,221)
Derivative instruments 76,471 (7,648)
Stock-based compensation expenses 12,979 13,663
Deferred financing costs amortization and other 6,552 5,059
Working capital and other changes:    
Change in accounts receivable 4,297 75,799
Change in inventory 2,054 3,685
Change in prepaid expenses 1,423 3,394
Change in other current assets (114) 5,538
Change in other assets 100 0
Change in accounts payable, interest payable and accrued liabilities (18,034) (22,624)
Change in other current liabilities 9,001 0
Change in other liabilities 10 (21)
Net cash provided by operating activities 91,401 229,886
Cash flows from investing activities:    
Capital expenditures (231,341) (587,430)
Proceeds from sale of properties 11,679 0
Costs related to sale of properties (310) 0
Derivative settlements 103,790 213,336
Advances from joint interest partners 769 (406)
Net cash used in investing activities (115,413) (374,500)
Cash flows from financing activities:    
Proceeds from revolving credit facility 359,000 320,000
Principal payments on revolving credit facility (462,000) (665,000)
Repurchase of senior unsecured notes (56,925) 0
Deferred financing costs (751) (3,591)
Proceeds from sale of common stock 182,953 463,010
Purchases of treasury stock (1,520) (1,932)
Net cash provided by financing activities 20,757 112,487
Decrease in cash and cash equivalents (3,255) (32,127)
Cash and cash equivalents:    
Beginning of period 9,730 45,811
End of period 6,475 13,684
Supplemental non-cash transactions:    
Change in accrued capital expenditures (17,015) (156,368)
Change in asset retirement obligations $ (8,785) $ 2,649