Restructuring Charges (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) number_of_employees	Dec. 31, 2017 USD ($) number_of_employees	Dec. 31, 2016 USD ($) number_of_employees
Restructuring Cost and Reserve [Line Items]
Number of employees reduced in connection with workforce of certain facilities | number_of_employees	490	163	582
2018 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	$ 2,815
Other exit costs	$ 1,773
2017 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs		$ 2,172
Other exit costs		531
Facility lease obligations		$ 264
2016 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs			$ 3,630
Other exit costs			$ 977
Americas [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees reduced in connection with workforce of certain facilities | number_of_employees	432	160	370
Americas [Member] | 2018 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	$ 2,496
Other exit costs	$ 1,773
Americas [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs		$ 1,985
Other exit costs		531
Facility lease obligations		$ 264
Americas [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs			$ 1,726
Other exit costs			$ 924
Asia [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees reduced in connection with workforce of certain facilities | number_of_employees	23	3	212
Asia [Member] | 2018 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	$ 274
Other exit costs	$ 0
Asia [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs		$ 187
Other exit costs		0
Facility lease obligations		$ 0
Asia [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs			$ 1,904
Other exit costs			0
Europe [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees reduced in connection with workforce of certain facilities | number_of_employees	35
Europe [Member] | 2018 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	$ 45
Other exit costs	$ 0
Europe [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs			0
Other exit costs			$ 53