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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Oct. 01, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Income tax provision | $ 3,614 | $ 0 |  |
Effective tax rate reconciliation, percent | 170.00% |  |  |
Tax cuts and jobs act, income tax expense (benefit) | $ 4,400 |  |  |
Retained Earnings | Accounting Standards Update 2016-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase to retained earnings |  |  |  | $ 8,300
Scenario, Forecast |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Federal statutory tax rate, blended rate |  |  | 24.30% |

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