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Share-based Compensation Schedule of Share Based Payments Award Valuation Assumptions (Tables)
6 Months Ended
Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The Company used the following significant assumptions to estimate the grant date fair value for the options using the Black Scholes valuation approach:
 
For the Six Months Ended June 30, 2019
Risk-free interest rate
2.30% - 2.51%
Expected exercise term (years)
6.0 - 6.5
Expected dividend yield
2.1% - 2.3%
Expected volatility
41%