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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%

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