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Employee Benefit Plans (Components Of Net Periodic Benefit Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]      
Service cost $ 3,207 $ 3,346 $ 3,140
Interest cost on projected benefit obligation 2,777 2,387 2,449
Expected return on plan assets (4,736) (5,284) (4,775)
Amortization of unrecognized loss 1,445 725 1,142
Amortization of unrecognized prior service (credit) cost   (5) 17
Net periodic pension cost $ 2,693 $ 1,169 $ 1,973