Restructuring and Impairment Charges (Schedule Of Restructuring Reserve Activity) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Restructuring Cost and Reserve [Line Items]
Accrued	$ 163	$ 1,847
Cash Charges	0	6,438
Non-cash charges	0	212
Cash payments	(90)	(5,972)
Accrued	73	2,256
Impairment And Loss On Right Of Use Asset [Member]
Restructuring Cost and Reserve [Line Items]
Accrued	0	0
Non-cash charges		269
Accrued	0	0
Employee Severance And Retention [Member]
Restructuring Cost and Reserve [Line Items]
Accrued	163	1,596
Non-cash charges	0	(57)
Cash payments	(90)	(1,075)
Accrued	73	464
Other Charges Related To Facility Closure [Member]
Restructuring Cost and Reserve [Line Items]
Accrued	0	251
Cash Charges		6,438
Cash payments		(4,897)
Accrued	$ 0	$ 1,792