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Equity Incentive Plan Equity Incentive Plan (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following table summarizes the activity related to restricted common stock for the years ended December 31, 2016 and 2015:
 
Year Ended December 31,
 
2016
 
2015
 
Shares
 
Weighted Average Grant Date Fair Market Value
 
Shares
 
Weighted Average Grant Date Fair Market Value
Outstanding at Beginning of Period
2,290,609

 
$
10.36

 
2,002,406

 
$
10.32

Granted
2,019,261

 
7.56

 
1,177,526

 
10.47

Vested
(1,369,229
)
 
(10.05
)
 
(828,164
)
 
(10.42
)
Forfeited
(301,217
)
 
(8.50
)
 
(61,159
)
 
(10.17
)
Outstanding at End of Period
2,639,424

 
$
8.59

 
2,290,609

 
$
10.36