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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

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Fair value portion of assets held under deferred compensation agreements.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset.

+ References

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Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Publisher FASB
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-Topic 230
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