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Benefit Plans (Schedule Of Net Benefit Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Benefit Plans [Abstract]      
Service cost $ 361 $ 317 $ 337
Interest cost 553 667 701
Expected return on plan assets (1,120) (1,072) (1,165)
Amortization of prior service cost     (94)
Recognized net actuarial loss 705 547 579
Net period cost 499 459 358
Effect of settlement loss     564
Total pension expense $ 499 $ 459 $ 922