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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Awards
The following table summarizes restricted stock award activity for the years ended December 31, 2017 and 2016:
 
Shares
 
Weighted Average Share Price
Unvested balance at December 31, 2015
394,697

 
$
12.56

Granted
20,770

 
13.13

Vested
(121,899
)
 
12.60

Forfeited
(7,500
)
 
10.87

Unvested balance at December 31, 2016
286,068

 
12.63

Granted
254,534

 
15.46

Vested
(111,024
)
 
12.82

Forfeited
(6,667
)
 
15.21

Unvested balance at December 31, 2017
422,911

 
$
14.19