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Cash, Cash Equivalents, and Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Sep. 27, 2020 | Sep. 29, 2019 | Dec. 31, 2019
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Gross realized gains on sale of investments | $ 787 | $ 361 | $ 3,613 | $ 818 |
Gross realized losses on sale of investments | 1 | $ 67 | 22 | $ 103 |
Other Current Assets |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Accrued interest receivable | $ 1,912 |  | $ 1,912 |  | $ 2,874

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