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Fair Value Measurements (Details) (USD $) In Thousands | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Assets |  |
Derivative instruments, at fair value | $ 211,986 | $ 225,339
Total assets | 7,293,089 | 7,098,438
Liabilities |  |
Derivative instruments, at fair value | 97,531 | 106,721
Total liabilities | 4,056,534 | 4,019,742
Fair Value | Recurring Basis |  |
Assets |  |
Derivative instruments, at fair value | 211,986 |
Total assets | 211,986 |
Liabilities |  |
Derivative instruments, at fair value | 97,531 |
Total liabilities | 97,531 |
Quoted prices in active markets for identical assets (Level 1) | Recurring Basis |  |
Assets |  |
Derivative instruments, at fair value | 2,698 |
Total assets | 2,698 |
Liabilities |  |
Derivative instruments, at fair value | 3,339 |
Total liabilities | 3,339 |
Significant other observable inputs (Level 2) | Recurring Basis |  |
Assets |  |
Derivative instruments, at fair value | 107,316 |
Total assets | 107,316 |
Liabilities |  |
Derivative instruments, at fair value | 94,192 |
Total liabilities | 94,192 |
Significant unobservable inputs (Level 3) | Recurring Basis |  |
Assets |  |
Derivative instruments, at fair value | 101,972 |
Total assets | $ 101,972 |

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