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Employee Benefit Plans (Components Of Net Periodic Benefit Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]        
Service cost $ 837 $ 785 $ 1,673 $ 1,570
Interest cost on projected benefit obligation 597 614 1,195 1,227
Expected return on plan assets (1,321) (1,194) (2,642) (2,388)
Amortization of unrecognized prior service credit (18) (13) (36) (26)
Amortization of unrecognized net actuarial loss 188 291 375 583
Net periodic benefit expense $ 283 $ 483 $ 565 $ 966