Stock Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-based Compensation Arrangements by Share-based Payment Award, Restricted Stock Units, Vested and Expected to Vest [Table Text Block]

The following table presents a summary of the RSUs awarded in accordance with the 2015, 2016, and 2017 Award Plan Summaries, as of September 30, 2018:

	Number of RSUs Granted	Weighted-Average Grant Date Fair Value		Number of Unvested RSUs
2015 Award	5,445	$	27.91	730
2016 Award	3,569	45.45		2,026
2017 Award	3,225	$	52.95	3,225
Total	12,239			5,981