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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Weighted Average Assumptions Used in Calculating the Fair Value of Stock Option
The fair value of the grants issued in the nine months ended September 30, 2012 was calculated with the following weighted average assumptions:
 
Risk free interest rate
1.3
%
Expected life of option in years
6.5

Expected dividend yield
3.3
%
Expected volatility
29.4
%