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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Assets |  |
Deferred compensation plan | $ 10,608 | $ 10,838
Derivative Contracts | 50,824 | 195,512
Total Assets | 61,432 | 206,350
Liabilities |  |
Deferred Compensation Plan | 23,893 | 20,187
Derivative Contracts | 192 | 385
Total Liabilities | 24,085 | 20,572
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Deferred compensation plan | 10,608 | 10,838
Total Assets | 10,608 | 10,838
Liabilities |  |
Deferred Compensation Plan | 23,893 | 20,187
Total Liabilities | 23,893 | 20,187
Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Derivative Contracts | 41,351 | 195,512
Total Assets | 41,351 | 195,512
Liabilities |  |
Derivative Contracts | 192 | 385
Total Liabilities | 192 | 385
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Derivative Contracts | 9,473 |
Total Assets | $ 9,473 |

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