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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2015
Stock-Based Compensation [Abstract]  
Schedule of Weighted Average Assumptions Used for Estimating the Grant-Date Fair Value of Each Option Grant
The fair value of options granted during the nine months ended September 30, 2015, were established at the date of grant using a Black-Scholes option pricing model with the weighted average assumptions as follows:

  
Nine Months Ended
September 30
 
  
2015
  
2014
 
Expected dividend yield
  
3.72
%
  
3.40
%
Risk-free interest rate
  
1.54
%
  
2.01
%
Expected volatility
  
30.77
%
  
30.77
%
Expected term (in years)
  
7.0
   
7.0
 
Weighted average fair value of options
 
$
6.60
  
$
7.76