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Employee Stock Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock options

Stock option activity under all of the Company’s share-based compensation plans for the nine months ended September 30, 2017 was as follows:

 

      Number of
Options
    Weighted
Average
Exercise Price
 
  Outstanding, January 1, 2017       134,150     $ 85.22  
  Granted              
  Exercised              
  Cancelled       (42,085 )     71.50  
  Outstanding, September 30, 2017       92,065     $ 91.43  
  Options exercisable at September 30, 2017       88,185     $ 91.22