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Share-based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of restricted stock or restricted stock unit activity

Table 15.1 summarizes restricted stock or restricted stock unit (collectively called “restricted stock”) activity during 2017.
 
Table
15.1
 
 
 
 
 
Weighted Average Grant Date Fair Market Value
 
Shares
 
Restricted stock outstanding at December 31, 2016
$
7.44

 
3,146,672

 
Granted
10.41

 
1,631,744

 
Vested
7.71

 
(1,409,347
)
 
Forfeited
8.43

 
(68,460
)
 
Restricted stock outstanding at December 31, 2017
$
8.78

 
3,300,609