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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Taxes        
Income tax provision $ 10,223 $ 11,608 $ 21,523 $ 23,899
Effective income tax rate (as a percent) 18.10% 18.10% 18.20% 18.80%