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Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income (loss) $ (71,271) $ 208,786
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation, depletion and amortization 237,696 188,548
Gain on sale of properties 0 (187,033)
Impairment of oil and gas properties 24,837 804
Deferred income taxes (38,221) 118,695
Derivative instruments (7,648) 83,173
Stock-based compensation expenses 13,663 9,678
Deferred financing costs amortization and other 5,059 3,220
Working capital and other changes:    
Change in accounts receivable 75,799 (37,132)
Change in inventory 3,685 3,016
Change in prepaid expenses 3,394 1,284
Change in other current assets 5,538 (30)
Change in other assets 0 (1,477)
Change in accounts payable and accrued liabilities (22,624) 91,543
Change in other current liabilities 0 3,311
Change in other liabilities (21) (132)
Net cash provided by operating activities 229,886 486,254
Cash flows from investing activities:    
Capital expenditures (586,661) (606,924)
Acquisition of oil and gas properties 769 8,116
Proceeds from sale of properties 0 324,888
Costs related to sale of properties 0 (2,337)
Derivative settlements 213,336 (13,644)
Advances from joint interest partners (406) (5,919)
Net cash used in investing activities (374,500) (312,052)
Cash flows from financing activities:    
Proceeds from sale of common stock 463,010 0
Proceeds from revolving credit facility 320,000 100,000
Principal payments on revolving credit facility (665,000) (335,570)
Deferred financing costs 3,591 85
Purchases of treasury stock (1,932) (3,315)
Other 0 (176)
Net cash provided by (used in) financing activities 112,487 (239,146)
Decrease in cash and cash equivalents (32,127) (64,944)
Cash and cash equivalents:    
Beginning of period 45,811 91,901
End of period 13,684 26,957
Supplemental non-cash transactions:    
Change in accrued capital expenditures (156,368) 51,129
Change in asset retirement obligations $ 2,649 $ 1,624