Restructuring Charges (Schedule Of Accrued Restructuring) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 290
Restructuring charges	3,557
Cash Payment	(2,936)
Non-Cash Activity	(116)
Foreign Exchange Adjustments	(29)
Ending Balance	766
2018 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	2,949
Cash Payment	(2,313)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	636
2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	245
Restructuring charges	369
Cash Payment	(455)
Non-Cash Activity	0
Foreign Exchange Adjustments	(29)
Ending Balance	130
2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	45
Restructuring charges	239
Cash Payment	(168)
Non-Cash Activity	(116)
Foreign Exchange Adjustments	0
Ending Balance	0
Severance [Member] | 2018 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	1,626
Cash Payment	(1,626)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	0
Severance [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	47
Restructuring charges	3
Cash Payment	(50)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	0
Severance [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	29
Restructuring Reserve Accrual Adjustment	(6)
Cash Payment	(23)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	0
Lease Facility Costs [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	96
Cash Payment	(96)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	0
Other Exit Costs | 2018 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	1,323
Cash Payment	(687)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	636
Other Exit Costs | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	198
Restructuring charges	270
Cash Payment	(309)
Non-Cash Activity	0
Foreign Exchange Adjustments	(29)
Ending Balance	130
Other Exit Costs | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	16
Restructuring charges	245
Cash Payment	(145)
Non-Cash Activity	(116)
Foreign Exchange Adjustments	0
Ending Balance	$ 0