Retirement Plans And Postretirement Benefits (Components Of Consolidated Net Pension Costs Retirement Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Foreign [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 624	$ 674	$ 710
Interest cost	275	253	199
Expected return on assets	(424)	(330)	(299)
Mark-to-market loss (gain)	3,302	503	(53)
Net Cost	3,777	1,100	557
U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,297	1,315	1,305
Interest cost	5,070	4,709	5,352
Expected return on assets	(5,026)	(5,679)	(5,268)
Mark-to-market loss (gain)	205	2,473	(4,140)
Net Cost	$ 1,546	$ 2,818	$ (2,751)