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Income Taxes (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Taxes        
Effective tax rate (as a percent) 32.60% 36.60% 32.10% 35.60%
Income tax at U.S. federal statutory tax rate (as a percent)     35.00%