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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2011
Income Taxes  
Estimated Effective Income Tax Rate
     Six Months Ended June 30,  
     2011     2010  

Estimated effective income tax rate:

     

Continuing operations

      26.9 %      29.4 % 
                

Discontinued operations

      26.2 %      28.3 % 
                

Consolidated overall

      26.9 %      29.4 %