Restructuring Charges (Schedule Of Accrued Restructuring) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 1,283
Restructuring charges	3,972
Cash Payment	(4,560)
Non-Cash Activity	(167)
Foreign Exchange Adjustments	11
Ending Balance	539
2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	2,342
Cash Payment	(1,815)
Non-Cash Activity	(125)
Foreign Exchange Adjustments	9
Ending Balance	411
2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	1,283
Restructuring charges	1,630
Cash Payment	(2,745)
Non-Cash Activity	(42)
Foreign Exchange Adjustments	2
Ending Balance	128
Severance [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	1,903
Cash Payment	(1,561)
Non-Cash Activity	(125)
Foreign Exchange Adjustments	0
Ending Balance	217
Severance [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	738
Restructuring Reserve Accrual Adjustment	(44)
Cash Payment	(626)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	68
Lease Facility Costs [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	105
Cash Payment	(105)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	0
Lease Facility Costs [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	58
Cash Payment	(58)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	0
Other Exit Costs | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	334
Cash Payment	(149)
Non-Cash Activity	0
Foreign Exchange Adjustments	9
Ending Balance	194
Other Exit Costs | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	545
Restructuring charges	1,616
Cash Payment	(2,061)
Non-Cash Activity	(42)
Foreign Exchange Adjustments	2
Ending Balance	$ 60