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Fair Value Measurements - Assets and Liabilities on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Deferred compensation plan | $ 14,699 | $ 14,966
Derivative instruments | 60,105 | 2,239
Total assets | 74,804 | 17,205
Liabilities |  |
Deferred compensation plan | 25,780 | 29,145
Derivative instruments | 2,440 | 30,637
Total liabilities | 28,220 | 59,782
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Deferred compensation plan | 14,699 | 14,966
Derivative instruments | 0 | 0
Total assets | 14,699 | 14,966
Liabilities |  |
Deferred compensation plan | 25,780 | 29,145
Derivative instruments | 0 | 0
Total liabilities | 25,780 | 29,145
Recurring Basis | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Deferred compensation plan | 0 | 0
Derivative instruments | 35,689 | 0
Total assets | 35,689 | 0
Liabilities |  |
Deferred compensation plan | 0 | 0
Derivative instruments | 0 | 0
Total liabilities | 0 | 0
Recurring Basis | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Deferred compensation plan | 0 | 0
Derivative instruments | 24,416 | 2,239
Total assets | 24,416 | 2,239
Liabilities |  |
Deferred compensation plan | 0 | 0
Derivative instruments | 2,440 | 30,637
Total liabilities | $ 2,440 | $ 30,637

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