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Income Taxes - Valuation Allowance (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017
Income Taxes
Maximum NOL deduction in any year as percentage of taxable income	80.00%
Income tax benefit related to valuation allowance		$ 6.5

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- Definition

The maximum amount of NOL deductions that may be used in any one year as a percentage of taxable income, effective with respect to NOLs arising in tax years after December 31, 2017.

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- Definition

Amount of income tax expense (benefit) recognized related to a reduction in the Company's valuation allowance.

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