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Stock Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
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 six months ended June 30, 2019:
 
Number of
Shares
 
Weighted Average
Grant Date
Fair Value
Unvested balance at December 31, 2018
349,885

 
$
10.62

Granted
132,327

 
7.69

Vested
(86,316
)
 
$
13.97

Forfeited
(10,580
)
 
15.06

Unvested balance at June 30, 2019
385,316

 
$
9.92