Summary of Significant Accounting Policies (Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018
Schedule of Investments [Line Items]
Cash and cash equivalents	$ 52,073	$ 76,819
Short-term investments	1,096	1,327
Other Assets	13,066	10,677
Amortized cost basis of debt securities	12,542	12,202
Debt securities
Schedule of Investments [Line Items]
Cash and cash equivalents	0	0
Short-term investments	1,096	1,327
Other Assets	11,566	10,677
Equity investment
Schedule of Investments [Line Items]
Cash and cash equivalents	0	0
Short-term investments	0	0
Other Assets	1,500	0
Cash and money market accounts
Schedule of Investments [Line Items]
Cash and cash equivalents	52,073	76,819
Short-term investments	0	0
Other Assets	$ 0	$ 0