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Benefit Plans (Schedule Of Benefit Plans) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Pension Costs    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 575 $ 498
Interest cost 1,316 1,241
Expected return on plan assets (1,338) (1,502)
Net cost 553 237
Postretirement Costs    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 242 251
Net cost $ 242 $ 251