Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Effective income tax        
Effective tax rate (as a percent) 24.10% 36.90% 33.30% 39.20%
Annual estimate
       
Effective income tax        
Effective tax rate (as a percent)     37.00%