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Stock Based Compensation (Schedule of Fair Value Assumptions) (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Stock Based Compensation [Abstract]    
Dividend yield 3.72% 3.89%
Expected life 10 years 10 years
Expected volatility 29.10% 29.11%
Risk-free interest rate 2.68% 2.41%
Weighted average fair value of options granted $ 7.18 $ 6.83