Restructuring Charges (Schedule Of Accrued Restructuring) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Restructuring Cost And Reserve [Line Items]
Beginning Balance	$ 4,454
Restructuring charges	3,172
Cash Payment	(5,723)
Non-Cash Activity	(41)
Ending Balance	1,862
Severance [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance	3,996
Restructuring charges	589
Cash Payment	(3,174)
Non-Cash Activity	(28)
Ending Balance	1,383
Lease Facility Costs [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance	50
Restructuring charges	951
Cash Payment	(980)
Non-Cash Activity	(13)
Ending Balance	8
Other Exit Costs [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance	408
Restructuring charges	1,632
Cash Payment	(1,569)
Non-Cash Activity	0
Ending Balance	$ 471