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Fair Value Measurements (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 USD ($) Impaired_Asset_And_Liability | Jun. 30, 2014 Impaired_Asset_And_Liability | Dec. 31, 2014 USD ($)
Assets |  |  |
Deferred compensation plan | $ 13,282 |  | $ 13,115
Derivative contracts | 76,178 |  | 137,603
Total assets | 89,460 |  | 150,718
Liabilities |  |  |
Deferred compensation plan | 30,130 |  | 28,932
Total liabilities | $ 30,130 |  | 28,932
Number of non-financial assets and liabilities impaired | Impaired_Asset_And_Liability | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Assets |  |  |
Deferred compensation plan | $ 13,282 |  | 13,115
Derivative contracts | 0 |  | 0
Total assets | 13,282 |  | 13,115
Liabilities |  |  |
Deferred compensation plan | 30,130 |  | 28,932
Total liabilities | 30,130 |  | 28,932
Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Assets |  |  |
Deferred compensation plan | 0 |  | 0
Derivative contracts | 28,180 |  | 51,645
Total assets | 28,180 |  | 51,645
Liabilities |  |  |
Deferred compensation plan | 0 |  | 0
Total liabilities | 0 |  | 0
Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Assets |  |  |
Deferred compensation plan | 0 |  | 0
Derivative contracts | 47,998 |  | 85,958
Total assets | 47,998 |  | 85,958
Liabilities |  |  |
Deferred compensation plan | 0 |  | 0
Total liabilities | $ 0 |  | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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