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Income Taxes (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Effective tax rate |  | 22.20% | 24.90% |
Provision for income taxes |  | $ 7,253 | $ 7,680 |
Change in enacted tax rate |  | 400 |  |
Net income |  | 25,429 | 23,121 | $ 69,496
Gain on bargain purchase of a business | $ 8,400 | $ 0 | $ 8,388 |

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