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Stock Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation, Performance Shares Award Unvested Activity [Table Text Block]
The following table presents a summary of the unvested RSUs from the 2015 and 2016 Award Plan Summaries as of September 30, 2017:
 
 
Number of Unvested RSUs
Weighted-Average Grant Date Fair Value
2015 Award
 
3,089

$
27.91

2016 Award
 
3,569

45.45

Total
 
6,658
$
37.31