Restructuring Charges (Schedule Of Components Of Restructuring Charges) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 5,197	$ 4,936
2018 [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	2,815
Other exit costs	1,773
Total restructuring charges	4,588
2018 [Member] | Americas [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	2,496
Other exit costs	1,773
Total restructuring charges	4,269
2018 [Member] | Europe [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	45
Other exit costs	0
Total restructuring charges	45
2018 [Member] | Asia [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	274
Other exit costs	0
Total restructuring charges	274
2017 [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs		2,172
Facility lease costs		264
Other exit costs		531
Total restructuring charges	369	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	$ 240	$ 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