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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, 2020
Dec. 31, 2019
Dec. 31, 2018
United States      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 1,322 $ 1,297 $ 1,315
Interest cost 3,949 5,070 4,709
Expected return on assets (4,730) (5,026) (5,679)
Mark-to-market loss (gain) (613) (205) (2,473)
Net Cost 1,154 1,546 2,818
Foreign [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1,183 624 674
Interest cost 174 275 253
Expected return on assets (401) (424) (330)
Mark-to-market loss (gain) (2,596) (3,302) (503)
Net Cost $ 3,552 $ 3,777 $ 1,100