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Fair Value Measurements - Recurring Basis (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair value of assets and liabilities measured on recurring basis      
Proceeds from the sales and maturities of available-for-sale securities $ 0 $ 0 $ 175,000,000
Fair value, recurring basis      
Fair value of assets and liabilities measured on recurring basis      
Deferred compensation trusts 9,626,000 7,719,000  
Fair value, recurring basis | Foreign currency      
Fair value of assets and liabilities measured on recurring basis      
Derivative assets 22,667,000 7,167,000  
Derivative liabilities 2,571,000 6,561,000  
Fair value, recurring basis | Commodity      
Fair value of assets and liabilities measured on recurring basis      
Derivative assets 806,000 46,000  
Derivative liabilities 5,059,000 1,247,000  
Fair value, recurring basis | Level 1      
Fair value of assets and liabilities measured on recurring basis      
Deferred compensation trusts 9,626,000 7,719,000  
Fair value, recurring basis | Level 2 | Foreign currency      
Fair value of assets and liabilities measured on recurring basis      
Derivative assets 22,667,000 7,167,000  
Derivative liabilities 2,571,000 6,561,000  
Fair value, recurring basis | Level 2 | Commodity      
Fair value of assets and liabilities measured on recurring basis      
Derivative assets 806,000 46,000  
Derivative liabilities $ 5,059,000 $ 1,247,000