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Condensed Consolidated Statement of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net income $ 92,484 $ 26,502
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 83,099 26,912
Impairment of oil and gas properties 2,571 2,917
Deferred income taxes 55,161 16,069
Derivative instruments (56,009) 4,119
Stock-based compensation expenses 3,898 1,571
Debt discount amortization and other 1,265 648
Working capital and other changes:    
Change in accounts receivable (26,840) (19,945)
Change in inventory (21,636) (65)
Change in prepaid expenses 1,500 (254)
Change in other current assets 490 (211)
Change in other assets (7,365) (103)
Change in accounts payable and accrued liabilities 40,022 43,612
Change in other current liabilities 2,470  
Change in other liabilities 750 323
Net cash provided by (used in) operating activities 171,860 102,095
Cash flows from investing activities:    
Capital expenditures (440,781) (212,267)
Derivative settlements (2,465) (4,652)
Purchases of short-term investments   (164,913)
Redemptions of short-term investments 19,994 39,974
Advances to joint interest partners 1,978 983
Advances from joint interest partners 19,380 5,851
Net cash used in investing activities (401,894) (335,024)
Cash flows from financing activities:    
Proceeds from issuance of senior notes   400,000
Purchases of treasury stock (1,206) (559)
Debt issuance costs (746) (10,027)
Net cash (used in) provided by financing activities (1,952) 389,414
(Decrease) increase in cash and cash equivalents (231,986) 156,485
Cash and cash equivalents:    
Beginning of period 470,872 143,520
End of period 238,886 300,005
Supplemental non-cash transactions:    
Change in accrued capital expenditures 104,486 (6,676)
Change in asset retirement obligations $ 4,185 $ 2,357