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Income Taxes (Schedule of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017
Income Taxes [Abstract] |  |
Unrecognized tax benefits at beginning of year | $ 4,691 | $ 3,124
Increases based on tax positions related to the current year | 1,714 | 1,567
Additions for tax positions of prior year | 0 | 0
Reductions for tax positions of prior years | 0 | 0
Settlements | 0 | 0
Expiration of the statute of limitations for assessment of taxes | 0 | 0
Unrecognized tax benefits at end of year | $ 6,405 | $ 4,691

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