Income Taxes (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	1.50%	14.50%
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount	$ 100	$ 600
Operating Loss Carryforwards	84,400
Unrecognized Tax Benefits	0		$ 0
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 0		$ 0