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Income Taxes (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax provision | $ 23,998,000 | $ 24,024,000 | $ 75,428,000 | $ 60,622,000 |
Effective income tax rates | 37.60% | 39.50% | 37.60% | 37.50% |
Actual income tax rates | 34.50% | 44.70% | 36.60% | 38.80% |
Unrecognized income tax benefits | 4,300,000 |  | 4,300,000 |  | 3,100,000
Unrecognized income tax benefits, if recognized, that would favorably affect the effective income tax rate | 2,200,000 |  | 2,200,000 |  | 1,700,000
Accrued interest expense related to unrecognized income tax benefits | 300,000 |  | 300,000 |  | 300,000
Interest expense related to unrecognized income tax benefits | 100,000 | 200,000 |  | 600,000 |
Interest income related to unrecognized income tax benefits |  |  | 100,000 |  |
Unrecognized income tax benefits to be recognized in the next twelve months | $ 100,000 |  | $ 100,000 |  |

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