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Stock-Based Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Information Regarding Restricted Shares
The following table summarizes information regarding Restricted Shares:
 
Three Months Ended March 31, 2019
 
Shares
 
Weighted Average
Grant-Date Fair
Value
Number of unvested shares:
 
 
 
Outstanding - January 1, 2019
1,530,214

 
$
45.06

Granted
729,855

 
46.94

Vested
(326,919
)
 
42.29

Forfeited
(127,888
)
 
39.82

Outstanding as of March 31, 2019
1,805,262

 
$
46.69