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Balance Sheet Components (Schedule of Changes in Carrying Value of Long-term Investments) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 27, 2021
Jun. 28, 2020
Balance Sheet Related Disclosures [Abstract]    
Beginning Balance [1] $ 7,758 $ 8,147
Additions from purchase of investments 340 5,815
Impairment 0 (4,530)
Ending Balance [1] $ 8,098 $ 9,432
[1] The balances excluded an investment in limited partnership funds of $0.6 million, $0.4 million and $0.6 million as of June 27, 2021, June 28, 2020 and December 31, 2020, respectively. Additionally, the balance as of June 27, 2021 excluded an investment in convertible debt of $1.3 million.