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Fair Value Measurements - Financial Assets and Liabilities, Recurring (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Deferred compensation plan | $ 13,765 | $ 12,587
Derivative instruments | 13,880 | 2,991
Liabilities |  |
Deferred compensation plan | 26,199 | 24,169
Derivative instruments | 2,688 | 40,259
Recurring basis |  |
Assets |  |
Deferred compensation plan | 13,765 | 12,587
Derivative instruments | 13,880 | 2,991
Total assets | 27,645 | 15,578
Liabilities |  |
Deferred compensation plan | 26,199 | 24,169
Derivative instruments | 3,638 | 40,259
Total liabilities | 29,837 | 64,428
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |
Assets |  |
Deferred compensation plan | 13,765 | 12,587
Derivative instruments | 0 | 0
Total assets | 13,765 | 12,587
Liabilities |  |
Deferred compensation plan | 26,199 | 24,169
Derivative instruments | 0 | 0
Total liabilities | 26,199 | 24,169
Significant Other Observable Inputs (Level 2) | Recurring basis |  |
Assets |  |
Deferred compensation plan | 0 | 0
Derivative instruments | 0 | 0
Total assets | 0 | 0
Liabilities |  |
Deferred compensation plan | 0 | 0
Derivative instruments | 1,111 | 21,400
Total liabilities | 1,111 | 21,400
Significant Unobservable Inputs (Level 3) | Recurring basis |  |
Assets |  |
Deferred compensation plan | 0 | 0
Derivative instruments | 13,880 | 2,991
Total assets | 13,880 | 2,991
Liabilities |  |
Deferred compensation plan | 0 | 0
Derivative instruments | 2,527 | 18,859
Total liabilities | $ 2,527 | $ 18,859

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