Income Taxes Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Income Tax Disclosure [Abstract]
Federal operating loss carryforwards	$ 84,400
Income tax expense, valuation allowance	0	$ (30,374)	$ 2,959
Unrecognized Tax Benefits	0	0
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	0	$ 0
Discrete tax benefit	$ 800