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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Income Tax Contingency [Line Items]      
Unrecognized tax benefits $ 414 $ 406 $ 375
Additions based on tax positions taken during a current period 27 8 31
Reductions related to settlement of tax matters 0 0 0
Unrecognized tax benefits 441 414 406
Unrecognized tax benefits, income tax penalties and interest accrued $ 0 $ 0 $ 0