Income Taxes (Valuation Allowance for Deferred Tax Asset) (Details) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 7,153	$ 8,664	$ 4,159	$ 3,978
Charged to expenses	(839)	4,505	231
Adjustments to balance sheet	(672)	0	(50)
Balance at end of period	$ 7,153	$ 8,664	$ 4,159