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Balance Sheet Components (Schedule of Changes in Carrying Value of Long-term Investments) (Parentheticals) (Details) - USD ($)
$ in Thousands
Oct. 03, 2021
Dec. 31, 2020
Sep. 27, 2020
Balance Sheet Related Disclosures [Line Items]      
Equity investments $ 7,916 $ 8,395  
Limited partnership funds      
Balance Sheet Related Disclosures [Line Items]      
Equity investments 800 $ 600 $ 400
Convertible debt securities      
Balance Sheet Related Disclosures [Line Items]      
Equity investments $ 300