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Fair Value Measurements - Financial Assets and Liabilities, Recurring (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Deferred compensation plan | $ 16,050 | $ 14,966
Derivative instruments | 4,474 | 2,239
Liabilities |  |
Deferred compensation plan | 27,849 | 29,145
Recurring basis |  |
Assets |  |
Deferred compensation plan | 16,050 | 14,966
Derivative instruments | 4,474 | 2,239
Total assets | 20,524 | 17,205
Liabilities |  |
Deferred compensation plan | 27,849 | 29,145
Derivative instruments | 10,651 | 30,637
Total liabilities | 38,500 | 59,782
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis |  |
Assets |  |
Deferred compensation plan | 16,050 | 14,966
Derivative instruments | 0 | 0
Total assets | 16,050 | 14,966
Liabilities |  |
Deferred compensation plan | 27,849 | 29,145
Derivative instruments | 0 | 0
Total liabilities | 27,849 | 29,145
Significant Other Observable Inputs (Level 2) | Recurring basis |  |
Assets |  |
Deferred compensation plan | 0 | 0
Derivative instruments | 577 | 0
Total assets | 577 | 0
Liabilities |  |
Deferred compensation plan | 0 | 0
Derivative instruments | 5,415 | 0
Total liabilities | 5,415 | 0
Significant Unobservable Inputs (Level 3) | Recurring basis |  |
Assets |  |
Deferred compensation plan | 0 | 0
Derivative instruments | 3,897 | 2,239
Total assets | 3,897 | 2,239
Liabilities |  |
Deferred compensation plan | 0 | 0
Derivative instruments | 5,236 | 30,637
Total liabilities | $ 5,236 | $ 30,637

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