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Income Taxes (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Income Taxes |  |  |  |
Income tax provision | $ 8,191,000 | $ 14,683,000 | $ 32,090,000 | $ 33,249,000
Effective income tax rate (as a percent) | 14.00% | 21.70% | 17.30% | 17.50%
Income tax benefit due to change in estimate related to uncertain tax position | $ 1,400,000 |  | $ 1,400,000 | $ 3,300,000

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