Restructuring Charges (Schedule Of Accrued Restructuring) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 4,454	$ 3,956	$ 1,335
Restructuring Charges	9,345	12,900	8,507
Cash Payment	(9,555)	(9,715)	(4,931)
Non-Cash Activity	(733)	(2,687)	(944)
Foreign Exchange Adjustments	0	0	(11)
Ending Balance	3,511	4,454	3,956
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	3,996	3,956	282
Restructuring Charges	4,130	7,010	6,449
Cash Payment	(4,685)	(6,666)	(2,775)
Non-Cash Activity	(184)	(304)	0
Foreign Exchange Adjustments	0	0	0
Ending Balance	3,257	3,996	3,956
Lease Facility Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	50	0	0
Restructuring Charges	2,745	3,716	0
Cash Payment	(2,618)	(2,394)	0
Non-Cash Activity	(160)	(1,272)	0
Foreign Exchange Adjustments	0	0	0
Ending Balance	17	50	0
Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	408	0	1,053
Restructuring Charges	2,470	2,174	2,058
Cash Payment	(2,252)	(655)	(2,156)
Non-Cash Activity	(389)	(1,111)	(944)
Foreign Exchange Adjustments	0	0	(11)
Ending Balance	$ 237	$ 408	$ 0