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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