The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_LongTermInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Balance Sheet Components (Schedule of Changes in Carrying Value of Long-term Investments) (Parentheticals) (Details) - USD ($) $ in Thousands	Jun. 27, 2021	Dec. 31, 2020	Jun. 28, 2020
Balance Sheet Related Disclosures [Line Items]
Equity investments	$ 10,053	$ 8,395
Limited partnership funds
Balance Sheet Related Disclosures [Line Items]
Equity investments	600	$ 600	$ 400
Convertible debt
Balance Sheet Related Disclosures [Line Items]
Equity investments	$ 1,300