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Stock-Based Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Awards
A summary of the restricted stock awards as of September 30, 2018, along with the changes during the nine months then ended, is as follows:
 
 
Awards
 
Weighted Average
Grant Date
Fair Value
Nonvested at December 31, 2017
 
702,778

 
$
68.23

Granted
 
229,421

 
75.33

Vested
 
(220,254
)
 
63.92

Forfeited
 
(30,065
)
 
69.76

Nonvested at September 30, 2018
 
681,880

 
$
71.93