Borrowing Facilities (Details) $ in Thousands, THB in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 THB	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Nov. 12, 2015 USD ($)
Line of Credit Facility [Line Items]
Credit Agreement maturity date					Nov. 12, 2020
Derivative Notional Amount							$ 163,900	$ 172,500
Principal amount							226,568	$ 238,869
Credit Agreement [Member]
Line of Credit Facility [Line Items]
Credit Agreement capacity							430,000
Credit agreement, secured by percentage of stock of the Company's domestic subsidiaries					100.00%
Credit agreement, secured by percentage of voting capital stock of each direct foreign subsidiary					65.00%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit Agreement capacity							200,000
Term period					5 years
Credit Agreement maturity date					Nov. 12, 2020
Possible increase to total commitments under Credit Agreement							150,000
Letters of credit outstanding amount							2,100
Revolving credit facility, available for future borrowings							197,900
Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Term period					5 years
Credit Agreement maturity date					Nov. 12, 2020
Term Loan proceeds									$ 230,000
Term Loan frequency of periodic payments					quarterly
Quarterly principal installments					$ 2,900
Term Loan first required payment date					Mar. 31, 2016
Derivative Notional Amount							163,900
Principal amount							218,500
Term Loan Facility [Member] | Scenario Forecast [Member]
Line of Credit Facility [Line Items]
Quarterly principal installments	$ 8,600	$ 5,800	$ 4,300	$ 2,900
Standby Letters Of Credit [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, available for future borrowings							20,000
Foreign currencies [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, available for future borrowings							$ 20,000
Thailand Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit Agreement maturity date					Oct. 31, 2017
Thailand Subsidiary [Member] | Thailand Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit Agreement capacity | THB						THB 350
Minimum [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
U.S. Credit facility, commitment fee					0.30%
Maximum [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
U.S. Credit facility, commitment fee					0.40%
LIBOR Plus [Member] | Minimum [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate					1.25%
LIBOR Plus [Member] | Maximum [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate					2.25%
Alternate Base Rate Plus [Member] | Minimum [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate					0.25%
Alternate Base Rate Plus [Member] | Maximum [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate					1.25%