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Stock-Based Compensation Plans (Tables)
9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Awards
A summary of the restricted stock awards as of September 30, 2017, along with the changes during the nine months then ended, is as follows:
 
 
Awards
 
Weighted Average
Grant Date
Fair Value
Nonvested at December 31, 2016
 
850,422

 
$
67.25

Granted
 
205,789

 
75.04

Vested
 
(252,015
)
 
70.55

Forfeited
 
(93,818
)
 
68.67

Nonvested at September 30, 2017
 
710,378

 
$
68.16