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Stock Based Compensation (Tables)
6 Months Ended
Jun. 30, 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 June 30, 2020:
Number of RSUs GrantedWeighted-Average Grant Date Fair ValueNumber of Unvested RSUs
2018 Award 3,225  $52.95  433  
2019 Award3,734  47.75  2,120  
2020 Award8,91836.26  8,918  
Total15,87711,471