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Consolidated Statement of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income $ 227,959 $ 153,388 $ 79,390
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, depletion and amortization 307,055 206,734 74,981
Impairment of oil and gas properties 1,168 3,581 3,610
Loss on sale of properties 0 0 207
Deferred income taxes 134,583 92,479 46,789
Derivative instruments 35,432 (34,164) (1,595)
Stock-based compensation expenses 11,982 10,333 3,656
Debt discount amortization and other 4,248 2,810 1,561
Working capital and other changes:      
Change in accounts receivable (107,473) (90,103) (64,900)
Change in inventory (13,941) (29,313) (2,550)
Change in prepaid expenses (8,191) 346 (1,600)
Change in other current assets (56) 156 (491)
Change in other assets (3,248) (95) (139)
Change in accounts payable and accrued liabilities 107,451 76,706 36,316
Change in other current liabilities 0 (472) 472
Change in other liabilities 887 0 317
Net cash provided by operating activities 697,856 392,386 176,024
Cash flows from investing activities:      
Capital expenditures (893,524) (1,051,365) (613,720)
Acquisition of oil and gas properties (1,560,072) 0 0
Derivative settlements (8,133) 6,545 (3,841)
Purchases of short-term investments 0 (126,213) (184,907)
Redemptions of short-term investments 25,000 120,316 164,913
Advances from joint interest partners (8,347) 12,112 5,963
Proceeds from equipment and property sales 0 0 2,202
Net cash used in investing activities (2,445,076) (1,038,605) (629,390)
Cash flows from financing activities:      
Proceeds from issuance of senior notes 1,000,000 400,000 800,000
Proceeds from revolving credit facility 600,000 0 0
Principal payments on revolving credit facility (264,430) 0 0
Debt issuance costs (22,910) (8,012) (18,680)
Proceeds from sale of common stock 314,580 0 0
Purchases of treasury stock (1,566) (3,194) (602)
Net cash provided by financing activities 1,625,674 388,794 780,718
Increase (decrease) in cash and cash equivalents (121,546) (257,425) 327,352
Cash and cash equivalents:      
Beginning of period 213,447 470,872 143,520
End of period 91,901 213,447 470,872
Supplemental cash flow information:      
Cash paid for interest, net of capitalized interest 85,596 53,488 13,748
Cash paid for taxes 750 107 0
Supplemental non-cash transactions:      
Change in accrued capital expenditures 34,354 59,878 58,205
Change in asset retirement obligations $ 13,201 $ 10,230 $ 5,434