Restructuring Charges (Schedule Of Accrued Restructuring Balances) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 1,335
Restructuring charges	7,447
Cash Payment	(3,452)
Non-Cash Activity	(834)
Foreign Exchange Adjustments	(4)
Ending Balance	4,492
2019 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	6,986
Cash Payment	(1,667)
Non-Cash Activity	(834)
Foreign Exchange Adjustments	0
Ending Balance	4,485
2018 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	1,200
Restructuring charges	461
Cash Payment	(1,661)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	0
2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	135
Restructuring charges	0
Cash Payment	(124)
Non-Cash Activity	0
Foreign Exchange Adjustments	(4)
Ending Balance	7
Severance [Member] | 2019 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring Reserve Accrual Adjustment	5,408
Cash Payment	(1,108)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	4,300
Severance [Member] | 2018 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	282
Restructuring charges	0
Cash Payment	(282)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	0
Other Exit Costs [Member] | 2019 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	1,578
Cash Payment	(559)
Non-Cash Activity	(834)
Foreign Exchange Adjustments	0
Ending Balance	185
Other Exit Costs [Member] | 2018 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	918
Restructuring charges	461
Cash Payment	(1,379)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	0
Other Exit Costs [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	135
Restructuring charges	0
Cash Payment	(124)
Non-Cash Activity	0
Foreign Exchange Adjustments	(4)
Ending Balance	$ 7