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

 
$
58.86

Granted
 
240,323

 
83.12

Vested
 
(185,576
)
 
52.62

Forfeited
 
(23,050
)
 
67.13

Nonvested at June 30, 2015
 
943,047

 
$
66.08