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Retirement Plans And Postretirement Benefits (Schedule Of Benefit Plans) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Pension Costs        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 623 $ 574 $ 1,863 $ 1,724
Interest cost 1,033 1,316 3,098 3,948
Expected return on plan assets (1,283) (1,339) (3,849) (4,015)
Net cost 373 551 1,112 1,657
Postretirement Costs        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 180 236 545 717
Net cost $ 180 $ 236 $ 545 $ 717