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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2015
Stockholders' Equity Note [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, 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

 
 
 
 
 
 
Purchase of treasury stock
—

 
(5,130,334
)
 
(5,130,334
)
Stock issued under stock compensation plans
—

 
1,337,803

 
1,337,803

 
 
 
 
 
 
Balance - December 31, 2015
263,111,472

 
(71,931,558
)
 
(191,179,914
)