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Other Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Schedule of shares purchased in the open market for employees
 
     Shares
purchased
   Average price
per share
2012
             6,549       $71.14  
2013
             8,911       $42.27  
2014
             5,872       $44.55