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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2011
Income Tax Disclosure [Abstract]  
Schedule of Effective Tax Rate
                               
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2011   2010   2011   2010
    (In percentages)  
Effective income tax rate
    27       27       25       19