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

 
$
68.23

Granted
 
246,721

 
74.09

Vested
 
(236,334
)
 
64.38

Forfeited
 
(31,365
)
 
69.71

Nonvested at December 31, 2018
 
681,800

 
$
71.60