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Fair Value Measurements (Details) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 Impaired_Asset_And_Liability | Sep. 30, 2013 Impaired_Asset_And_Liability | Dec. 31, 2013
Assets |  |  |
Deferred compensation plan | $ 12,815,000 |  | $ 12,507,000
Derivative contracts | 19,445,000 |  | 13,792,000
Total assets | 32,260,000 |  | 26,299,000
Liabilities |  |  |
Deferred compensation plan | 30,277,000 |  | 33,211,000
Derivative contracts | 3,593,000 |  | 24,685,000
Total liabilities | 33,870,000 |  | 57,896,000
Number of non-financial assets and liabilities impaired | 0 | 0 |
Nonrecurring basis |  |  |
Liabilities |  |  |
Total liabilities | 0 |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Assets |  |  |
Deferred compensation plan | 12,815,000 |  | 12,507,000
Derivative contracts | 0 |  | 0
Total assets | 12,815,000 |  | 12,507,000
Liabilities |  |  |
Deferred compensation plan | 30,277,000 |  | 33,211,000
Derivative contracts | 0 |  | 0
Total liabilities | 30,277,000 |  | 33,211,000
Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Assets |  |  |
Deferred compensation plan | 0 |  | 0
Derivative contracts | 1,578,000 |  | 0
Total assets | 1,578,000 |  | 0
Liabilities |  |  |
Deferred compensation plan | 0 |  | 0
Derivative contracts | 1,216,000 |  | 6,983,000
Total liabilities | 1,216,000 |  | 6,983,000
Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Assets |  |  |
Deferred compensation plan | 0 |  | 0
Derivative contracts | 17,867,000 |  | 13,792,000
Total assets | 17,867,000 |  | 13,792,000
Liabilities |  |  |
Deferred compensation plan | 0 |  | 0
Derivative contracts | 2,377,000 |  | 17,702,000
Total liabilities | $ 2,377,000 |  | $ 17,702,000

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