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Share-based Compensation Schedule of Share Based Payments Award Valuation Assumptions (Tables)
6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The grant date fair values of options granted under the 2018 Plan were determined using the Black-Scholes valuation approach with the following assumptions:
For the Six Months Ended June 30, 2020
Risk-free interest rate
0.51% - 1.40%
Expected exercise term (years)6.0
Expected dividend yield
2.2% - 2.7%
Expected volatility
45% - 46%