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Stock-Based Compensation Plans (Tables)
9 Months Ended
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Awards
A summary of the restricted stock awards as of September 30, 2014, along with the changes during the nine months then ended, is as follows:
 
 
Awards
 
Weighted Average
Grant Date
Fair Value
Nonvested at December 31, 2013
 
933,740

 
$
49.87

Granted
 
274,040

 
67.18

Vested
 
(206,970
)
 
44.52

Forfeited
 
(52,010
)
 
53.50

Nonvested at September 30, 2014
 
948,800

 
$
55.83