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Stock Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
Share-based Compensation [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following summarizes the status of Restricted Stock and changes during the three months ended March 31, 2018:
 
Number of
Shares
 
Weighted Average
Grant Date
Fair Value
Unvested balance at December 31, 2017
141,095

 
$
16.79

Granted
41,176

 
19.21

Vested
(211
)
 
15.85

Forfeited
(704
)
 
22.68

Unvested balance at March 31, 2018
181,356

 
$
17.38