Restructuring And Cost Reduction Programs (Summary Of Accruals Related To Restructuring And Cost Reduction Programs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 1,843	$ 2,299	$ 1,698
Restructuring charges	10,955	7,116	6,957
Cash payments	(8,818)	(4,275)	(3,297)
Non-cash items	(1,741)	(3,297)	(3,059)
Ending balance	2,239	1,843	2,299
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	1,011	1,309	209
Restructuring charges	7,163	3,560	3,701
Cash payments	(6,987)	(3,678)	(2,797)
Non-cash items	(440)	(180)
Non-cash items			196
Ending balance	747	1,011	1,309
Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	832	990	1,489
Restructuring charges	3,792	3,556	3,256
Cash payments	(1,831)	(597)	(500)
Non-cash items	(1,301)	(3,117)	(3,255)
Ending balance	$ 1,492	$ 832	$ 990