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Benefit Plans (Schedule Of Benefit Plans) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension Costs        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 618 $ 575 $ 1,240 $ 1,150
Interest cost 1,032 1,316 2,065 2,632
Expected return on plan assets (1,282) (1,338) (2,566) (2,676)
Net cost 368 553 739 1,106
Postretirement Costs        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 174 239 365 481
Net cost $ 174 $ 239 $ 365 $ 481