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Employee Benefit Plans (Components Of Net Periodic Benefit Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]      
Service cost $ 3,346 $ 3,140 $ 2,885
Interest cost on projected benefit obligation 2,387 2,449 2,402
Expected return on plan assets (5,284) (4,775) (4,600)
Amortization of unrecognized loss 725 1,142 938
Amortization of unrecognized prior service (credit) cost (5) 17 20
Net periodic pension cost $ 1,169 $ 1,973 $ 1,645