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Fair Value Measurements - Financial Assets and Liabilities, Recurring (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Assets |  |
Deferred compensation plan | $ 12,586 | $ 13,115
Derivative instruments | 48,445 | 137,603
Total assets | 61,031 | 150,718
Liabilities |  |
Deferred compensation plan | 24,263 | 28,932
Total liabilities | 24,263 | 28,932
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |
Assets |  |
Deferred compensation plan | 12,586 | 13,115
Derivative instruments | 0 | 0
Total assets | 12,586 | 13,115
Liabilities |  |
Deferred compensation plan | 24,263 |
Total liabilities | 24,263 | 28,932
Significant Other Observable Inputs (Level 2) | Recurring basis |  |
Assets |  |
Deferred compensation plan | 0 | 0
Derivative instruments | 16,152 | 51,645
Total assets | 16,152 | 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 instruments | 32,293 | 85,958
Total assets | 32,293 | 85,958
Liabilities |  |
Deferred compensation plan | 0 | 0
Total liabilities | $ 0 | $ 0

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