Available for sale investments for which the fair value option was elected.

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Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments.

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Amount of cash inflow from sale 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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Fair Value of Financial Instruments - Narrative (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 27, 2020 USD ($) company	Jun. 28, 2020 USD ($)	Sep. 29, 2019 USD ($)	Sep. 27, 2020 USD ($) company	Sep. 29, 2019 USD ($)	Dec. 29, 2019 USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Proceeds from sale of investments		$ 11,470
Number of companies quoted on an active public market \| company	1			1
Redeemable period				45 days
Minimum
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redeemable period				30 days
Maximum
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redeemable period				90 days
Fair Value, Recurring
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	$ 13,384		$ 24,916	$ 13,384	$ 24,916	$ 25,518
Gain (loss) on investments	$ 1,067		$ 566	$ (144)	$ 1,293