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Stock-Based Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Awards
A summary of these awards as of September 30, 2013, along with the changes during the nine months then ended follows:
 
 
Awards
 
Weighted Average
Grant Date
Fair Value
Nonvested at December 31, 2012
 
1,023,350

 
$
38.19

Granted
 
286,536

 
60.64

Vested
 
(179,856
)
 
35.84

Forfeited
 
(54,520
)
 
41.68

Nonvested at September 30, 2013
 
1,075,510

 
$
44.41