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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) 35.00% 35.00% 35.00% 33.20%
Effective tax rate excluding the effect of the change in applicable tax law (as a percent)       35.00%