Restructuring Charges (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) number_of_employees	Dec. 31, 2015 USD ($) number_of_employees	Dec. 31, 2014 USD ($) number_of_employees
2016 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	$ 3,630
Number of employees reduced in connection with workforce of certain facilities | number_of_employees	582
Other exit costs	$ 977
2015 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs		$ 2,542
Number of employees reduced in connection with workforce of certain facilities | number_of_employees		672
Other exit costs		$ 3,301
Facility lease obligations		2,462
2014 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs			$ 876
Number of employees reduced in connection with workforce of certain facilities | number_of_employees			104
Other exit costs			$ 3
Americas [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	$ 1,726
Number of employees reduced in connection with workforce of certain facilities | number_of_employees	370
Other exit costs	$ 924
Americas [Member] | 2015 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs		$ 1,564
Number of employees reduced in connection with workforce of certain facilities | number_of_employees		223
Other exit costs		$ 3,099
Facility lease obligations		2,462
Americas [Member] | 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs			$ 827
Number of employees reduced in connection with workforce of certain facilities | number_of_employees			104
Other exit costs			$ 0
Asia [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	$ 1,904
Number of employees reduced in connection with workforce of certain facilities | number_of_employees	212
Other exit costs	$ 0
Asia [Member] | 2015 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs		$ 506
Number of employees reduced in connection with workforce of certain facilities | number_of_employees		438
Other exit costs		$ 0
Facility lease obligations		0
Asia [Member] | 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs			49
Other exit costs			$ 3
Europe [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs	0
Other exit costs	$ 53
Europe [Member] | 2015 [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination costs		$ 472
Number of employees reduced in connection with workforce of certain facilities | number_of_employees		11
Other exit costs		$ 202
Facility lease obligations		$ 0