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Additional Balance Sheet and Cash Flow Information - Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 29, 2020 | Dec. 31, 2019 | Mar. 31, 2019
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Debt securities | $ 0 | $ 0 | $ 10,003
Mutual funds | 44,144 | 52,575 | 49,896
Total marketable securities | $ 44,144 | $ 52,575 | $ 59,899

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