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Stock-Based Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Awards
A summary of the restricted stock awards as of September 30, 2015, along with the changes during the nine months then ended, is as follows:
 
 
Awards
 
Weighted Average
Grant Date
Fair Value
Nonvested at December 31, 2014
 
911,350

 
$
58.86

Granted
 
267,123

 
84.12

Vested
 
(237,633
)
 
50.82

Forfeited
 
(32,870
)
 
67.14

Nonvested at September 30, 2015
 
907,970

 
$
68.12