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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 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 three months ended March 31, 2015, were established at the date of grant using a Black-Scholes option pricing model with the weighted average assumptions as follows:

  
Three Months Ended
 
  
March 31
 
  
2015
 
Expected dividend yield
  
3.72
%
Risk-free interest rate
  
1.54
%
Expected volatility
  
30.77
%
Expected term (in years)
  
7.0
 
Weighted average fair value of options
 
$
6.60