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Cash, Cash Equivalents, and Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Jun. 28, 2020
Jun. 30, 2019
Dec. 31, 2019
Cash and Cash Equivalents [Line Items]          
Reclassification of credit loss on investments $ 85 $ 0 $ (75) $ 0  
Gross realized gains on sale of investments 962 394 2,826 458  
Gross realized losses on sale of investments 7 $ 12 21 $ 36  
Other Current Assets          
Cash and Cash Equivalents [Line Items]          
Accrued interest receivable $ 1,958   $ 1,958   $ 2,874