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Consolidated Statement of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income (loss) $ 153,388 $ 79,390 $ (29,695)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation, depletion and amortization 206,734 74,981 37,832
Impairment of oil and gas properties 3,581 3,610 11,967
Loss on sale of properties   207  
Deferred income taxes 92,479 46,789 42,962
Derivative instruments (34,164) (1,595) 7,653
Stock-based compensation expenses 10,333 3,656 9,970
Debt discount amortization and other 2,810 1,561 470
Working capital and other changes:      
Change in accounts receivable (90,103) (64,900) (44,450)
Change in inventory (29,313) (2,550) (498)
Change in prepaid expenses 346 (1,600) (356)
Change in other current assets 156 (491)  
Change in other assets (95) (139) (164)
Change in accounts payable and accrued liabilities 76,706 36,316 13,917
Change in other current liabilities (472) 472  
Change in other liabilities   317 4
Net cash provided by operating activities 392,386 176,024 49,612
Cash flows from investing activities:      
Capital expenditures (1,053,315) (613,223) (226,544)
Acquisition of oil and gas properties     (86,393)
Derivative settlements 6,545 (3,841) (120)
Purchases of short-term investments (126,213) (184,907)  
Redemptions of short-term investments 120,316 164,913  
Advances to joint interest partners 1,950 (497) 1,010
Advances from joint interest partners 12,112 5,963 2,512
Proceeds from equipment and property sales   2,202  
Net cash used in investing activities (1,038,605) (629,390) (309,535)
Cash flows from financing activities:      
Proceeds from sale of common stock     399,669
Proceeds from credit facility     72,000
Principal payments on credit facility     (107,000)
Proceeds from issuance of senior notes 400,000 800,000  
Purchases of treasury stock (3,194) (602)  
Debt issuance costs (8,012) (18,680) (1,788)
Net cash provided by financing activities 388,794 780,718 362,881
Increase (decrease) in cash and cash equivalents (257,425) 327,352 102,958
Cash and cash equivalents:      
Cash and cash equivalents at beginning of period 470,872 143,520 40,562
Cash and cash equivalents at end of period 213,447 470,872 143,520
Supplemental cash flow information:      
Cash paid for interest, net of capitalized interest 53,488 13,748 1,002
Cash paid for taxes 107    
Supplemental non-cash transactions:      
Change in accrued capital expenditures 59,878 58,205 35,181
Change in asset retirement obligations $ 10,230 $ 5,434 $ 1,227