Income Taxes (Valuation Allowance for Deferred Tax Asset) (Details) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 10,260	$ 7,153	$ 8,664	$ 4,159
Charged to expenses	98	(839)	4,505
Adjustments to balance sheet	3,009	(672)	0
Balance at end of period	$ 10,260	$ 7,153	$ 8,664