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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2014
Stockholders' Equity [Abstract]  
Changes in number of shares in stockholders' equity
Changes in the number of shares of the Company’s outstanding stock for the last three years were as follows:

  
Common
Stock
  
Treasury
Stock
  
Shares
Outstanding
 
       
Balance - December 31, 2011
  
263,111,472
   
(17,579,397
)
  
245,532,075
 
             
Purchase of treasury stock
  
–
   
(412,800
)
  
(412,800
)
Stock issued under stock compensation plans
  
–
   
1,576,861
   
1,576,861
 
             
Balance - December 31, 2012
  
263,111,472
   
(16,415,336
)
  
246,696,136
 
             
Purchase of treasury stock
  
–
   
(26,955,623
)
  
(26,955,623
)
Stock issued under stock compensation plans
  
–
   
1,687,795
   
1,687,795
 
             
Balance - December 31, 2013
  
263,111,472
   
(41,683,164
)
  
221,428,308
 
             
Purchase of treasury stock
  
–
   
(27,970,492
)
  
(27,970,492
)
Stock issued under stock compensation plans
  
–
   
1,514,629
   
1,514,629
 
             
Balance - December 31, 2014
  
263,111,472
   
(68,139,027
)
  
(194,972,445
)