Restructuring Charges (Schedule Of Accrued Restructuring Balances) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 1,335
Restructuring charges	557
Cash Payment	(1,494)
Foreign Exchange Adjustments	(1)
Ending Balance	397
2019 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	329
Cash Payment	(161)
Foreign Exchange Adjustments	0
Ending Balance	168
2018 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	1,200
Restructuring charges	228
Cash Payment	(1,333)
Foreign Exchange Adjustments	0
Ending Balance	95
2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	135
Restructuring charges	0
Cash Payment	0
Foreign Exchange Adjustments	(1)
Ending Balance	134
Severance [Member] | 2019 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring Reserve Accrual Adjustment	236
Cash Payment	(130)
Foreign Exchange Adjustments	0
Ending Balance	106
Severance [Member] | 2018 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	282
Restructuring charges	0
Cash Payment	(282)
Foreign Exchange Adjustments	0
Ending Balance	0
Other Exit Costs [Member] | 2019 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	93
Cash Payment	(31)
Foreign Exchange Adjustments	0
Ending Balance	62
Other Exit Costs [Member] | 2018 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	918
Restructuring charges	228
Cash Payment	(1,051)
Foreign Exchange Adjustments	0
Ending Balance	95
Other Exit Costs [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	135
Restructuring charges	0
Cash Payment	0
Foreign Exchange Adjustments	(1)
Ending Balance	$ 134