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Employee Benefit Plans (Reconciliation Of The Plan's Benefit Obligations, Fair Value Of Assets And The Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]        
Projected benefit obligation at beginning of period $ 70,436 $ 63,002    
Service cost 3,346 3,140 $ 2,885  
Interest cost 2,387 2,449 2,402  
Actuarial (gain) loss (3,298) 5,016    
Benefits paid and plan expenses (3,297) (3,171)    
Projected benefit obligation at end of period 69,574 70,436 63,002  
Fair value of plan assets at beginning of period 83,348 75,252    
Actual return on plan assets (4,863) 11,267    
Benefits paid and plan expenses (3,297) (3,171)    
Fair value of plan assets at end of period 83,348 75,252 $ 75,252 $ 75,188
Funded status at end of period $ 5,614 $ 12,912