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Condensed Consolidated Statement Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net income (loss) $ 16,441 $ (6,847)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation, depletion and amortization 38,886 13,812
Impairment of oil and gas properties 368 1,381
Deferred income taxes 9,822 (4,161)
Derivative instruments 18,586 31,666
Stock-based compensation expenses 1,591 527
Debt discount amortization and other 648 256
Working capital and other changes:    
Change in accounts receivable (26,038) (6,667)
Change in inventory (9,641) (37)
Change in prepaid expenses 31 479
Change in other current assets 483 (113)
Change in other assets   (3)
Change in accounts payable and accrued liabilities 10,775 (7,448)
Change in other current liabilities (188)  
Change in other liabilities 1,001  
Net cash provided by operating activities 62,765 22,845
Cash flows from investing activities:    
Capital expenditures (269,975) (91,126)
Derivative settlements (1,291) (512)
Purchases of short-term investments 0 (114,974)
Redemptions of short-term investments 19,994  
Advances to joint interest partners 655 885
Advances from joint interest partners 5,484 4,938
Net cash used in investing activities (245,133) (200,789)
Cash flows from financing activities:    
Proceeds from issuance of senior notes   400,000
Purchases of treasury stock (1,181) (559)
Debt issuance costs (25) (10,027)
Net cash (used in) provided by financing activities (1,206) 389,414
(Decrease) increase in cash and cash equivalents (183,574) 211,470
Cash and cash equivalents:    
Beginning of period 470,872 143,520
End of period 287,298 354,990
Supplemental non-cash transactions:    
Change in accrued capital expenditures 22,336 (16,644)
Change in asset retirement obligations $ 2,867 $ 1,656