Restructuring Charges (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) number_of_employees	Dec. 31, 2018 USD ($) number_of_employees	Dec. 31, 2017 USD ($) number_of_employees
2019 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	$ 6,449
Number of employees reduced in connection with workforce of certain facilities | number_of_employees	468
Other exit costs	$ 1,597
2018 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs		$ 2,815
Number of employees reduced in connection with workforce of certain facilities | number_of_employees		490
Other exit costs		$ 1,773
2017 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs			$ 2,172
Number of employees reduced in connection with workforce of certain facilities | number_of_employees			163
Other exit costs			$ 531
Facility lease obligations			264
Americas [Member] | 2019 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	$ 4,499
Number of employees reduced in connection with workforce of certain facilities | number_of_employees	386
Other exit costs	$ 1,561
Americas [Member] | 2018 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs		$ 2,496
Number of employees reduced in connection with workforce of certain facilities | number_of_employees		432
Other exit costs		$ 1,773
Americas [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs			$ 1,985
Number of employees reduced in connection with workforce of certain facilities | number_of_employees			160
Other exit costs			$ 531
Facility lease obligations			264
Asia [Member] | 2019 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	$ 1,950
Number of employees reduced in connection with workforce of certain facilities | number_of_employees	81
Other exit costs	$ 36
Asia [Member] | 2018 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs		$ 274
Number of employees reduced in connection with workforce of certain facilities | number_of_employees		23
Other exit costs		$ 0
Asia [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs			$ 187
Number of employees reduced in connection with workforce of certain facilities | number_of_employees			3
Other exit costs			$ 0
Facility lease obligations			$ 0
Europe [Member] | 2019 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	$ 0
Number of employees reduced in connection with workforce of certain facilities | number_of_employees	1
Other exit costs	$ 0
Europe [Member] | 2018 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs		$ 45
Number of employees reduced in connection with workforce of certain facilities | number_of_employees		35
Other exit costs		$ 0