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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Benefit Plans [Abstract]      
Projected benefit obligation at beginning of period $ 63,002 $ 59,232  
Service cost 3,140 2,885 $ 2,324
Interest cost 2,449 2,402 2,328
Actuarial (gain) loss 5,016 1,210  
Benefits paid and plan expenses (3,171) (2,727)  
Projected benefit obligation at end of period 70,436 63,002 59,232
Fair value of plan assets at beginning of period 75,252 72,358  
Actual return on plan assets 11,267 5,621  
Benefits paid and plan expenses (3,171) (2,727)  
Fair value of plan assets at end of period 83,348 75,252 $ 72,358
Funded status at end of period $ 12,912 $ 12,250