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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2015
Shareholders' Equity [Abstract]  
Changes in restricted stock units
Changes in restricted stock units during the year ended December 31, 2015 are as follows:

  
2015
  
Weighted Average
Grant Date
Fair Value
 
Unvested restricted stock units, beginning of year
  
197
  
$
33.54
 
Units granted
  
22
   
42.77
 
Units forfeited
  
(6
)
  
39.63
 
Units vested
  
(66
)
  
28.70
 
Unvested restricted stock units, end of year
  
147
   
36.83