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Fair Value Measurement Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments under executive deferred compensation plan	$ 32,447	$ 28,715
Private equity securities	35	32
Private equity securities measured at net asset value	4,626	4,890
Foreign currency forward contracts, assets	13,606	7,401
Obligations under executive deferred compensation plan	32,447	28,715
Foreign currency forward contracts, liabilities	4,803	3,613
Quoted Prices in Active Markets for Identical Items (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments under executive deferred compensation plan	32,447	28,715
Private equity securities	35	32
Private equity securities measured at net asset value	0	0
Foreign currency forward contracts, assets	0	0
Obligations under executive deferred compensation plan	32,447	28,715
Foreign currency forward contracts, liabilities	0	0
Quoted Prices in Active Markets for Similar Items (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments under executive deferred compensation plan	0	0
Private equity securities	0	0
Private equity securities measured at net asset value	0	0
Foreign currency forward contracts, assets	13,606	7,401
Obligations under executive deferred compensation plan	0	0
Foreign currency forward contracts, liabilities	4,803	3,613
Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments under executive deferred compensation plan	0	0
Private equity securities	0	0
Private equity securities measured at net asset value	0	0
Foreign currency forward contracts, assets	0	0
Obligations under executive deferred compensation plan	0	0
Foreign currency forward contracts, liabilities	$ 0	$ 0

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Marketable Securities, Equity Securities, Measured at Net Asset Value

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

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