Restructuring Charges (Schedule Of Accrued Restructuring Balances) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 290	$ 1,283
Restructuring charges	5,197	4,936
Cash Payment	(4,012)	(5,891)
Non-Cash Activity	(116)	(42)
Foreign Exchange Adjustments	(24)	4
Ending Balance	1,335	290	$ 1,283
2018 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	4,588
Cash Payment	(3,388)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	1,200	0
2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	245	0
Restructuring charges	369	2,967
Cash Payment	(455)	(2,724)
Non-Cash Activity	0	0
Foreign Exchange Adjustments	(24)	2
Ending Balance	135	245	0
2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	45	1,283
Restructuring charges	240	1,969	4,607
Cash Payment	(169)	(3,167)
Non-Cash Activity	(116)	(42)
Foreign Exchange Adjustments	0	2
Ending Balance	0	45	1,283
Severance [Member] | 2018 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	2,815
Cash Payment	(2,533)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	282	0
Severance [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	47	0
Restructuring charges	3	2,172
Cash Payment	(50)	(2,125)
Non-Cash Activity	0	0
Foreign Exchange Adjustments	0	0
Ending Balance	0	47	0
Severance [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	29	738
Restructuring Reserve Accrual Adjustment	(6)	(42)
Cash Payment	(23)	(667)
Non-Cash Activity	0	0
Foreign Exchange Adjustments	0	0
Ending Balance	0	29	738
Lease Facility Costs [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0	0
Restructuring charges	96	264
Cash Payment	(96)	(264)
Non-Cash Activity	0	0
Foreign Exchange Adjustments	0	0
Ending Balance	0	0	0
Lease Facility Costs [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0	0
Restructuring charges		58
Cash Payment		(58)
Non-Cash Activity		0
Foreign Exchange Adjustments		0
Ending Balance		0	0
Other Exit Costs [Member] | 2018 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	1,773
Cash Payment	(855)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	918	0
Other Exit Costs [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	198	0
Restructuring charges	270	531
Cash Payment	(309)	(335)
Non-Cash Activity	0	0
Foreign Exchange Adjustments	(24)	2
Ending Balance	135	198	0
Other Exit Costs [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	16	545
Restructuring charges	246	1,953
Cash Payment	(146)	(2,442)
Non-Cash Activity	(116)	(42)
Foreign Exchange Adjustments	0	2
Ending Balance	$ 0	$ 16	$ 545