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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2011
Income Tax Disclosure [Abstract] 
Schedule of Effective Tax Rate
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2011
 
2010
 
2011
 
2010
 
(In percentages)
Effective income tax rate
17
 
23
 
23
 
21