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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 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 June 30, 2018, along with the changes during the six months then ended, is as follows:
 
 
Awards
 
Weighted Average
Grant Date
Fair Value
Nonvested at December 31, 2017
 
702,778

 
$
68.23

Granted
 
210,971

 
75.28

Vested
 
(191,794
)
 
62.67

Forfeited
 
(23,015
)
 
70.22

Nonvested at June 30, 2018
 
698,940

 
$
71.80