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Stock-Based Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Awards
A summary of the awards as of March 31, 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
 
211,040

 
64.31

Vested
 
(124,880
)
 
47.41

Forfeited
 
(31,240
)
 
49.23

Nonvested at March 31, 2014
 
988,660

 
$
53.28