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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 item | Dec. 31, 2012 item | Dec. 31, 2011 item
Financial Assets and Liabilities Fair Value Measurement |  |  |
Number of non-financial assets and liabilities impaired | 0 | 0 | 0
Assets |  |  |
Deferred compensation plan | $ 12,507 | $ 10,608 |
Derivative contracts | 13,792 | 54,454 |
Total assets | 26,299 | 65,062 |
Liabilities |  |  |
Deferred compensation plan | 33,211 | 23,893 |
Derivative contracts | 24,685 | 3,822 |
Total liabilities | 57,896 | 27,715 |
Transfer of Assets from Level 1 to Level 2 | 0 | 0 | 0
Transfer of Liabilities from Level 1 to Level 2 | 0 | 0 | 0
Transfer of Assets from Level 2 to Level 1 | 0 | 0 | 0
Transfer of Liabilities from Level 2 to Level 1 | 0 | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Assets |  |  |
Deferred compensation plan | 12,507 | 10,608 |
Total assets | 12,507 | 10,608 |
Liabilities |  |  |
Deferred compensation plan | 33,211 | 23,893 |
Total liabilities | 33,211 | 23,893 |
Significant Other Observable Inputs (Level 2) |  |  |
Assets |  |  |
Derivative contracts |  | 9,473 |
Total assets |  | 9,473 |
Liabilities |  |  |
Derivative contracts | 6,983 |  |
Total liabilities | 6,983 |  |
Significant Unobservable Inputs (Level 3) |  |  |
Assets |  |  |
Derivative contracts | 13,792 | 44,981 |
Total assets | 13,792 | 44,981 |
Liabilities |  |  |
Derivative contracts | 17,702 | 3,822 |
Total liabilities | $ 17,702 | $ 3,822 |

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