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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2014 item | Jun. 30, 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 | $ 13,152 |  | $ 12,507
Derivative contracts | 13,312 |  | 13,792
Total assets | 26,464 |  | 26,299
Liabilities |  |  |
Deferred compensation plan | 31,388 |  | 33,211
Derivative contracts | 50,851 |  | 24,685
Total liabilities | 82,239 |  | 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 | 13,152 |  | 12,507
Total assets | 13,152 |  | 12,507
Liabilities |  |  |
Deferred compensation plan | 31,388 |  | 33,211
Total liabilities | 31,388 |  | 33,211
Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Liabilities |  |  |
Derivative contracts | 10,624 |  | 6,983
Total liabilities | 10,624 |  | 6,983
Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Assets |  |  |
Derivative contracts | 13,312 |  | 13,792
Total assets | 13,312 |  | 13,792
Liabilities |  |  |
Derivative contracts | 40,227 |  | 17,702
Total liabilities | $ 40,227 |  | $ 17,702

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