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Retirement Plans And Postretirement Benefits (Components Of Consolidated Net Pension Costs Retirement Plans) (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
Expected return on assets (5,679) (5,268) (4,940)
Mark-to-market loss (gain) 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
Expected return on assets (330) (299) (298)
Mark-to-market loss (gain) 503 (53) (220)
Net Cost $ 1,100 $ 557 $ 423