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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective tax rate | 27.10% | 37.00% | 26.10% | 34.00% |
Provision for income taxes | $ 16,473 | $ 16,581 | $ 40,202 | $ 40,972 |
Change in enacted tax rate | $ (100) |  | 800 |  |
Change in Enacted Tax Rate, Percent | 36.00% | 28.00% |  |  |
Net income | $ 44,361 | $ 28,197 | $ 113,876 | $ 79,532 | $ 13,085

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