Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Effective income tax        
Effective tax rate (as a percent) 36.20% 34.60% 32.60% 37.10%
Annual estimate
       
Effective income tax        
Effective tax rate (as a percent)     38.00%