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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 Tax Disclosure [Abstract]        
Provision for income taxes as a percentage of earnings before income taxes 36.60% 36.10% 36.90% 35.80%