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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2011
Income Taxes 
Estimated Effective Income Tax Rate
     Nine Months Ended September 30,
         2011            2010    

Estimated effective income tax rate:

      

Continuing operations

    22.7%      24.2%  
  

 

   

 

Discontinued operations

    38.8%      8.2%  
  

 

   

 

Consolidated overall

    22.8%      24.2%