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Employee Benefit Plans (Components Of The Net Pension Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost-benefits earned during the year $ 410 $ 607 $ 651
Interest cost on projected benefit obligation 3,282 4,198 3,756
Expected return on plan assets (5,214) (4,842) (5,255)
Amortization of prior service cost (271) (271) (271)
Amortization of unrecognized net loss 2,138 2,288 2,267
Net periodic pension cost $ 345 $ 1,980 $ 1,148