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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Income tax provision | $ 31,618 | $ 29,711 | $ 92,257 | $ 76,873 |
Effective income tax rates | 27.90% | 27.70% | 28.10% | 27.70% |
Actual income tax rates | 27.90% | 27.10% | 27.90% | 27.10% |
Unrecognized income tax benefits | $ 0 |  | $ 0 |  | $ 0

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