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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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Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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