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Supplemental Oil And Gas Reserve Information - Unaudited (Standardized Measure Of Discounted Future Net Cash Flows From Projected Production Of Oil And Natural Gas Reserves) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Supplemental Oil And Gas Reserve Information - Unaudited [Abstract]      
Future cash inflows $ 6,508,604 $ 2,620,530 $ 664,480
Future production costs (1,690,264) (696,890) (258,137)
Future development costs (783,486) (362,328) (120,212)
Future income tax expense (1,225,395) [1] (495,788) [1]  
Future net cash flows 2,809,459 1,065,524 286,131
10% annual discount for estimated timing of cash flows (1,489,988) (579,789) (152,601)
Standardized measure of discounted future net cash flows $ 1,319,471 $ 485,735 $ 133,530
[1] Does not include the effect of income taxes on discounted future net cash flows for the years ended December 31, 2009 because as of December 31, 2009, the Company was a limited liability company not subject to entity-level taxation. Accordingly, no provision for federal or state corporate income taxes was provided because taxable income was passed through to the Company's equity holders.