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Summary of Significant Accounting Policies (Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Schedule of Investments [Line Items]
Cash and cash equivalents	$ 76,819	$ 23,348	$ 36,312	$ 28,548
Short-term investments	1,327	2,015
Long-term investments	10,677	10,479
Amortized cost basis of debt securities	12,202	12,660
Debt securities
Schedule of Investments [Line Items]
Cash and cash equivalents	0	0
Short-term investments	1,327	2,015
Long-term investments	10,677	10,479
Cash and money market accounts
Schedule of Investments [Line Items]
Cash and cash equivalents	76,819	23,348
Short-term investments	0	0
Long-term investments	$ 0	$ 0

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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