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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 item | Mar. 31, 2013 item | Dec. 31, 2013
Financial Assets and Liabilities Fair Value Measurement |  |  |
Number of non-financial assets and liabilities impaired | 0 | 0 |
Assets |  |  |
Deferred compensation plan | $ 12,886 |  | $ 12,507
Derivative contracts | 4,041 |  | 13,792
Total assets | 16,927 |  | 26,299
Liabilities |  |  |
Deferred compensation plan | 30,983 |  | 33,211
Derivative contracts | 77,469 |  | 24,685
Total liabilities | 108,452 |  | 57,896
Transfer of Assets from Level 1 to Level 2 | 0 | 0 |
Transfer of Liabilities from Level 1 to Level 2 | 0 | 0 |
Transfer of Assets from Level 2 to Level 1 | 0 | 0 |
Transfer of Liabilities from Level 2 to Level 1 | 0 | 0 |
Non-recurring basis |  |  |
Assets |  |  |
Total assets | 0 |  |
Non-financial assets | 0 |  |
Liabilities |  |  |
Total liabilities | 0 |  |
Non-financial liabilities | 0 |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Assets |  |  |
Deferred compensation plan | 12,886 |  | 12,507
Total assets | 12,886 |  | 12,507
Liabilities |  |  |
Deferred compensation plan | 30,983 |  | 33,211
Total liabilities | 30,983 |  | 33,211
Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Liabilities |  |  |
Derivative contracts | 13,060 |  | 6,983
Total liabilities | 13,060 |  | 6,983
Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Assets |  |  |
Derivative contracts | 4,041 |  | 13,792
Total assets | 4,041 |  | 13,792
Liabilities |  |  |
Derivative contracts | 64,409 |  | 17,702
Total liabilities | $ 64,409 |  | $ 17,702

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