Restructuring Charges (Schedule Of Components Of Restructuring Charges) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 4,936	$ 4,693
2017 [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	2,172
Facility lease costs	264
Other exit costs	531
Total restructuring charges	2,967
2017 [Member] | Americas [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	1,985
Facility lease costs	264
Other exit costs	531
Total restructuring charges	2,780
2017 [Member] | Asia [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	187
Facility lease costs	0
Other exit costs	0
Total restructuring charges	187
2016 [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs		3,630
Other exit costs		977
Total restructuring charges	$ 1,969	4,607
2016 [Member] | Americas [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs		1,726
Other exit costs		924
Total restructuring charges		2,650
2016 [Member] | Europe [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs		0
Other exit costs		53
Total restructuring charges		53
2016 [Member] | Asia [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs		1,904
Other exit costs		0
Total restructuring charges		1,904
2015 [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs			$ 2,542
Facility lease costs			2,462
Other exit costs			3,301
Total restructuring charges		$ 86	8,305
2015 [Member] | Americas [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs			1,564
Facility lease costs			2,462
Other exit costs			3,099
Total restructuring charges			7,125
2015 [Member] | Europe [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs			472
Facility lease costs			0
Other exit costs			202
Total restructuring charges			674
2015 [Member] | Asia [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs			506
Facility lease costs			0
Other exit costs			0
Total restructuring charges			$ 506