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Retirement Plans And Postretirement Benefits (Components Of Net Postretirement Costs) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 1,297 $ 1,315 $ 1,305
Interest cost 5,070 4,709 5,352
Mark-to-market loss (gain) loss 205 2,473 (4,140)
Net Cost 1,546 2,818 (2,751)
Foreign [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 624 674 710
Interest cost 275 253 199
Mark-to-market loss (gain) loss 3,302 503 (53)
Net Cost 3,777 1,100 557
Postemployment Retirement Benefit | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 0 0
Interest cost 269 264 333
Mark-to-market loss (gain) loss 585 (1,028) (1,257)
Net Cost 854 (764) (924)
Postemployment Retirement Benefit | Foreign [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 1 2
Interest cost 684 700 653
Mark-to-market loss (gain) loss 100 47 742
Net Cost $ 784 $ 748 $ 1,397