Income Taxes - Income Tax Reconciliation (Details)			12 Months Ended
Dec. 22, 2017	Dec. 21, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Income Tax Expense
Expected provision at federal statutory tax rate	21.00%	35.00%	21.00%	35.00%	35.00%
State tax expense, net of federal benefit			1.70%	1.70%	1.60%
Revaluation of deferred taxes			0.00%	(56.30%)	0.00%
Other			1.30%	0.70%	0.30%
Total income tax expense (benefit)			24.00%	(18.90%)	36.90%

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

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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