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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Taxes        
Income tax provision $ 13,441 $ 8,191 $ 34,964 $ 32,090
Effective income tax rate (as a percent) 19.80% 14.00% 18.80% 17.30%