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Share-based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Nonvested Restricted Shares and RSUs Activity
The following table summarizes nonvested restricted shares and RSUs activity for the nine months ended September 30, 2018:
 
Nonvested restricted shares and RSUs
 
Shares
 
Weighted-average
grant date fair value
Nonvested at December 31, 2017
 
2,340,892

 
$
15.08

Forfeited
 
(382,371
)
 
17.32

Vested
 
(461,097
)
 
18.29

Granted
 
636,322

 
17.07

Nonvested at September 30, 2018
 
2,133,746

 
$
15.02