Annual report pursuant to Section 13 and 15(d)

Stock Compensation (Valuation Assumptions Of Stock Option Plan) (Details)

v3.20.1
Stock Compensation (Valuation Assumptions Of Stock Option Plan) (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Stock Compensation [Abstract]    
Expected volatility 31.30% 28.60%
Risk free interest rate 2.20% 2.70%
Expected holding period 6 years 6 years
Dividend yield 3.00% 4.10%