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Retirement Plans And Postretirement Benefits (Components Of Net Postretirement Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 1,315 $ 1,305 $ 1,325
Interest cost 4,709 5,352 5,744
Mark-to-market loss (gain) loss 2,473 (4,140) (2,322)
Net Cost 2,818 (2,751) (193)
Foreign [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 674 710 698
Interest cost 253 199 243
Mark-to-market loss (gain) loss 503 (53) (220)
Net Cost 1,100 557 423
Postretirement Benefit Costs [Member] | U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 0 0
Interest cost 264 333 360
Plan amendment / curtailment 0 0 0
Mark-to-market loss (gain) loss 1,028 1,257 191
Net Cost (764) (924) 169
Postretirement Benefit Costs [Member] | Foreign [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1 2 4
Interest cost 700 653 764
Plan amendment / curtailment 0 0 993
Mark-to-market loss (gain) loss (47) (742) 225
Net Cost $ 748 $ 1,397 $ (450)