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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2019
Stock-Based Compensation  
Schedule of stock-based compensation fair value assumptions

    

2019

    

2018

    

Expected life (years)

3.0

3.0

Expected stock price volatility

 

23.3

%  

24.1

%  

Expected dividend yield

 

1.1

%  

1.0

%  

Risk-free interest rate

 

2.5

%  

2.4

%