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

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Fair Value of Financial Instruments - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020 USD ($) company	Jun. 30, 2019 USD ($)	Jun. 28, 2020 USD ($) company	Jun. 30, 2019 USD ($)	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	$ 12,837	$ 24,358	$ 12,837	$ 24,358	$ 25,518
Gain (loss) on investments	$ (780)	$ 177	$ (1,211)	$ 727