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Fair Value Measurements - Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Fair value of assets and liabilities measured on recurring basis |  |  |  |  |
Derivative assets | $ 11,378 |  | $ 11,378 |  | $ 15,530
Derivative liabilities | 15,387 |  | 15,387 |  | 18,280
Proceeds from sale and maturity of available-for-sale securities |  |  |  |  |
Proceeds from the sales and maturities of available-for-sale securities | 0 | $ 0 | 0 | $ 175,000 |
Fair Value, Measurements, Recurring |  |  |  |  |
Fair value of assets and liabilities measured on recurring basis |  |  |  |  |
Deferred compensation trusts | 24,288 |  | 24,288 |  | 26,690
Fair Value, Measurements, Recurring | Foreign currency contracts |  |  |  |  |
Fair value of assets and liabilities measured on recurring basis |  |  |  |  |
Derivative assets | 9,942 |  | 9,942 |  | 17,346
Derivative liabilities | 15,386 |  | 15,386 |  | 18,342
Fair Value, Measurements, Recurring | Commodity contracts |  |  |  |  |
Fair value of assets and liabilities measured on recurring basis |  |  |  |  |
Derivative assets | 2,421 |  | 2,421 |  |
Derivative liabilities | 1,674 |  | 1,674 |  |
Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |
Fair value of assets and liabilities measured on recurring basis |  |  |  |  |
Deferred compensation trusts | 24,288 |  | 24,288 |  | 26,690
Fair Value, Measurements, Recurring | Level 2 | Foreign currency contracts |  |  |  |  |
Fair value of assets and liabilities measured on recurring basis |  |  |  |  |
Derivative assets | 9,942 |  | 9,942 |  | 17,346
Derivative liabilities | 15,386 |  | 15,386 |  | $ 18,342
Fair Value, Measurements, Recurring | Level 2 | Commodity contracts |  |  |  |  |
Fair value of assets and liabilities measured on recurring basis |  |  |  |  |
Derivative assets | 2,421 |  | 2,421 |  |
Derivative liabilities | $ 1,674 |  | $ 1,674 |  |

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