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Stock Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Activity
The following table presents the restricted stock activity for the six months ended June 30, 2018 (in thousands, except per share amounts):
 
Number of Restricted Stock
 
Weighted Average
Grant Date
Fair Value
 
Total Intrinsic
Value of Restricted
Stock Vested
Outstanding as of December 31, 2017
1,355

 
$
22.67

 

Granted
125

 
$
27.24

 

Forfeited
(27
)
 
$
20.81

 


Vested
(56
)
 
$
24.81

 
$
1,564

Outstanding as of June 30, 2018
1,397

 
$
23.15