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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified |  |  | 3 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012 Minimum | Mar. 31, 2012 Maximum | Mar. 31, 2012 Fair value on a recurring basis Fair Value | Dec. 31, 2011 Fair value on a recurring basis Fair Value | Mar. 31, 2012 Fair value on a recurring basis Quoted prices in active markets for identical assets (Level 1) | Dec. 31, 2011 Fair value on a recurring basis Quoted prices in active markets for identical assets (Level 1) | Mar. 31, 2012 Fair value on a recurring basis Significant other observable inputs (Level 2) | Dec. 31, 2011 Fair value on a recurring basis Significant other observable inputs (Level 2) | Mar. 31, 2012 Fair value on a recurring basis Significant unobservable inputs (Level 3) | Dec. 31, 2011 Fair value on a recurring basis Significant unobservable inputs (Level 3)
Fair value assets and liabilities measured on a recurring basis |  |  |  |  |  |  |  |  |  |  |  |
Range of derived market volatilities (as a percent) |  |  | 25.00% | 48.00% |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments, at fair value | $ 608,647 | $ 512,161 |  |  | $ 608,647 | $ 512,161 | $ 2,077 | $ 3,612 | $ 450,504 | $ 365,238 | $ 156,066 | $ 143,311
Total assets |  |  |  |  | 608,647 | 512,161 | 2,077 | 3,612 | 450,504 | 365,238 | 156,066 | 143,311
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments, at fair value |  |  |  |  | 120,044 | 123,306 | 2,774 | 2,727 | 117,270 | 120,528 |  | 51
Total liabilities |  |  |  |  | $ 120,044 | $ 123,306 | $ 2,774 | $ 2,727 | $ 117,270 | $ 120,528 |  | $ 51

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