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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Income tax provision | $ 33,156 | $ 26,529 | $ 60,639 | $ 47,162 |
Effective income tax rates | 28.40% | 27.80% | 28.20% | 27.70% |
Actual income tax rates | 28.30% | 27.20% | 27.90% | 27.10% |
Unrecognized income tax benefits | $ 0 |  | $ 0 |  | $ 0

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