Fair Value Measurement (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments under executive deferred compensation plan	$ 28,497	$ 28,715
Private equity securities	24	32
Private equity securities measured at net asset value	4,886	4,890
Foreign currency forward contracts, assets	47	7,401
Obligations under executive deferred compensation plan	28,497	28,715
Foreign currency forward contracts, liabilities	3,427	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	28,497	28,715
Private equity securities	24	32
Foreign currency forward contracts, assets	0	0
Obligations under executive deferred compensation plan	28,497	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
Foreign currency forward contracts, assets	47	7,401
Obligations under executive deferred compensation plan	0	0
Foreign currency forward contracts, liabilities	3,427	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
Foreign currency forward contracts, assets	0	0
Obligations under executive deferred compensation plan	0	0
Foreign currency forward contracts, liabilities	$ 0	$ 0