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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2012
Income Tax Disclosure [Abstract]  
Schedule of Effective Tax Rate
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2012
 
2011
 
2012
 
2011
Effective income tax rate
20
%
 
27
%
 
(6
)%
 
25
%