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Condensed Consolidated Statement of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income $ 51,851 $ 16,441
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 66,261 38,886
Impairment of oil and gas properties 498 368
Deferred income taxes 30,987 9,822
Derivative instruments 14,612 18,586
Stock-based compensation expenses 2,289 1,591
Debt discount amortization and other 746 648
Working capital and other changes:    
Change in accounts receivable (3,360) (26,038)
Change in inventory (8,407) (9,641)
Change in prepaid expenses 293 31
Change in other current assets (232) 483
Change in accounts payable and accrued liabilities 15,009 10,775
Change in other current liabilities   (188)
Change in other liabilities   1,001
Net cash provided by operating activities 170,547 62,765
Cash flows from investing activities:    
Capital expenditures (217,678) (269,975)
Derivative settlements 1,686 (1,291)
Redemptions of short-term investments   19,994
Advances to joint interest partners (141) 655
Advances from joint interest partners (1,691) 5,484
Net cash used in investing activities (217,824) (245,133)
Cash flows from financing activities:    
Purchases of treasury stock (156) (1,181)
Debt issuance costs (25) (25)
Net cash used in financing activities (181) (1,206)
Decrease in cash and cash equivalents (47,458) (183,574)
Cash and cash equivalents:    
Cash and cash equivalents at beginning of period 213,447 470,872
Cash and cash equivalents at end of period 165,989 287,298
Supplemental non-cash transactions:    
Change in accrued capital expenditures 13,735 22,336
Change in asset retirement obligations $ 2,048 $ 2,867