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Retirement Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2016
Retirement Benefit Plans [Abstract]  
Schedule Of Components Of Net Periodic Benefit Cost
    Supplemental Executive
    Retirement Plans
 
Three Months Ended June 30,   2016   2015
 
Service cost $ 18 $ 19
Interest cost   32   31
Actuarial loss on supplemental executive retirement plan   7   8
     Net periodic benefit cost $ 57 $ 58
 
Six Months Ended June 30,        
 
Service cost $ 36 $ 36
Interest cost   64   62
Actuarial loss on supplemental executive retirement plan   14   19
    Net periodic benefit cost $ 114 $ 117