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Income Taxes (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Taxes        
Effective tax rate (as a percent) 36.60% 33.30% 35.60% 31.40%
U.S. federal statutory rate (as a percent)     35.00%