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

 
$
49.87

Granted
 
249,440

 
66.28

Vested
 
(148,965
)
 
46.71

Forfeited
 
(40,310
)
 
51.52

Nonvested at June 30, 2014
 
993,905

 
$
54.39