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Fair Value Measurement (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments under executive deferred compensation plan	$ 31,952	$ 32,447
Private equity securities measured at net asset value	4,695	4,661
Foreign currency forward contracts, assets	4,636	13,606
Obligations under executive deferred compensation plan	31,952	32,447
Foreign currency forward contracts, liabilities	4,194	4,803
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	248,775	0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	244,530
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Accretion of Discount	4,245
Debt Securities, Available-for-sale	248,775
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	31,952	32,447
Foreign currency forward contracts, assets	0	0
Obligations under executive deferred compensation plan	31,952	32,447
Foreign currency forward contracts, liabilities	0	0
Debt Securities, Available-for-sale	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
Foreign currency forward contracts, assets	4,636	13,606
Obligations under executive deferred compensation plan	0	0
Foreign currency forward contracts, liabilities	4,194	4,803
Debt Securities, Available-for-sale	0
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
Foreign currency forward contracts, assets	0	0
Obligations under executive deferred compensation plan	0	0
Foreign currency forward contracts, liabilities	0	$ 0
Debt Securities, Available-for-sale	$ 248,775

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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