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Fair Value Measurements - Financial Assets and Liabilities, Recurring (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Deferred compensation plan | $ 13,566 | $ 12,587
Derivative instruments | 12,354 | 2,991
Liabilities |  |
Deferred compensation plan | 25,420 | 24,169
Derivative instruments | 12,692 | 40,259
Recurring basis |  |
Assets |  |
Deferred compensation plan | 13,566 | 12,587
Derivative instruments | 10,332 | 2,991
Total assets | 23,898 | 15,578
Liabilities |  |
Deferred compensation plan | 25,420 | 24,169
Derivative instruments | 12,692 | 40,259
Total liabilities | 38,112 | 64,428
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |
Assets |  |
Deferred compensation plan | 13,566 | 12,587
Derivative instruments | 0 | 0
Total assets | 13,566 | 12,587
Liabilities |  |
Deferred compensation plan | 25,420 | 24,169
Derivative instruments | 0 | 0
Total liabilities | 25,420 | 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 | 7,429 | 21,400
Total liabilities | 7,429 | 21,400
Significant Unobservable Inputs (Level 3) | Recurring basis |  |
Assets |  |
Deferred compensation plan | 0 | 0
Derivative instruments | 10,332 | 2,991
Total assets | 10,332 | 2,991
Liabilities |  |
Deferred compensation plan | 0 | 0
Derivative instruments | 5,263 | 18,859
Total liabilities | $ 5,263 | $ 18,859

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