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Stock-based Compensation Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Share Activity [Table Text Block]
A summary of all non-vested share activity for the year ended December 31, 2017 was as follows:
 
Shares
 
Weighted Average Grant Date Price
Nonvested at January 1, 2017
577,221

 
$
10.42

Granted
366,580

 
15.05

Vested
(177,673
)
 
9.87

Forfeited
(43,669
)
 
12.84

Nonvested at December 31, 2017
722,459

 
$
12.76