Restructuring Charges (Schedule Of Components Of Restructuring Charges) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 4,693
2016 [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	3,630
Other exit costs	977
Total restructuring charges	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
2014 [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs			$ 876
Other exit costs			3
Total restructuring charges			879
2014 [Member] | Americas [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs			827
Other exit costs			0
Total restructuring charges			827
2014 [Member] | Asia [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs			49
Other exit costs			3
Total restructuring charges			$ 52