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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Employee Benefit Plans [Abstract]      
Projected benefit obligation at beginning of period $ 59,232 $ 61,732  
Service cost 2,885 2,324 $ 1,918
Interest cost 2,402 2,328 2,291
Actuarial (gain) loss 1,210 (4,406)  
Benefits paid and plan expenses (2,727) (2,746)  
Projected benefit obligation at end of period 63,002 59,232 61,732
Fair value of plan assets at beginning of period 72,358 75,584  
Actual return on plan assets 5,621 (480)  
Benefits paid and plan expenses (2,727) (2,746)  
Fair value of plan assets at end of period 75,252 72,358 $ 75,584
Funded status at end of period $ 12,250 $ 13,126