Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [Abstract]

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

The following table summarizes the RSUs awarded to Company executives in 2018, 2019 and 2020, and the number of such RSUs remaining unvested as of March 31, 2020:

	Number of RSUs Granted	Weighted-Average Grant Date Fair Value		Number of Unvested RSUs
2018 Award	3,225	$	52.95	433
2019 Award	3,734	47.75		2,120
2020 Award	8,918	$	36.26	8,918
Total	15,877			11,471