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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Income Tax Contingency [Line Items]      
Unrecognized tax benefits $ 441 $ 414 $ 406
Additions based on tax positions taken during a current period 39 27 8
Reductions related to settlement of tax matters 0 0 0
Unrecognized tax benefits 480 441 414
Unrecognized tax benefits, income tax penalties and interest accrued $ 0 $ 0 $ 0