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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2012
Income Tax Disclosure [Abstract]  
Schedule of Effective Tax Rate
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2012
 
2011
 
2012
 
2011
Effective income tax rate
31
%
 
17
%
 
6
%
 
23
%