Restructuring Charges (Schedule Of Accrued Restructuring) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 1,283
Restructuring charges	1,895
Cash Payment	(2,542)
Foreign Exchange Adjustments	2
Ending Balance	638
2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	1,001
Cash Payment	(770)
Foreign Exchange Adjustments	0
Ending Balance	231
2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	1,283
Restructuring charges	894
Cash Payment	(1,772)
Foreign Exchange Adjustments	2
Ending Balance	407
Severance [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	655
Cash Payment	(642)
Foreign Exchange Adjustments	0
Ending Balance	13
Severance [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	738
Restructuring charges	40
Cash Payment	(439)
Foreign Exchange Adjustments	0
Ending Balance	339
Lease Facility Costs [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	105
Cash Payment	(105)
Foreign Exchange Adjustments	0
Ending Balance	0
Other Exit Costs | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	241
Cash Payment	(23)
Foreign Exchange Adjustments	0
Ending Balance	218
Other Exit Costs | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	545
Restructuring charges	854
Cash Payment	(1,333)
Foreign Exchange Adjustments	2
Ending Balance	$ 68