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Benefit Plans (Schedule Of Benefit Plans) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pension Costs        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 575 $ 498 $ 1,150 $ 996
Interest cost 1,316 1,241 2,632 2,482
Expected return on plan assets (1,338) (1,502) (2,676) (3,004)
Net cost 553 237 1,106 474
Postretirement Costs        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 239 251 481 502
Net cost $ 239 $ 251 $ 481 $ 502