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Cash, Cash Equivalents, and Investments - Components of Cash, Cash Equivalents, and Investments (Details) - USD ($)
$ in Thousands
Sep. 27, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Cash $ 294,430 $ 155,498
Money market instruments 3,926 15,933
Cash and cash equivalents 298,356 171,431
Current investments, amortized cost of $94,761 and $235,610 in 2020 and 2019, respectively, allowance for expected credit losses of $0 in 2020 and 2019 95,365 240,470
Non-current investments, amortized cost of $613,838 and $431,633 in 2020 and 2019, respectively, allowance for expected credit losses of $75 and $0 in 2020 and 2019, respectively 619,343 433,452
Total 1,013,064 845,353
Treasury Bills    
Debt Securities, Available-for-sale [Line Items]    
Current investments, amortized cost of $94,761 and $235,610 in 2020 and 2019, respectively, allowance for expected credit losses of $0 in 2020 and 2019 0 92,914
Long-term investments 270,091 216,334
Corporate Bonds    
Debt Securities, Available-for-sale [Line Items]    
Current investments, amortized cost of $94,761 and $235,610 in 2020 and 2019, respectively, allowance for expected credit losses of $0 in 2020 and 2019 43,436 65,624
Long-term investments 216,451 146,474
Asset-Backed Securities    
Debt Securities, Available-for-sale [Line Items]    
Current investments, amortized cost of $94,761 and $235,610 in 2020 and 2019, respectively, allowance for expected credit losses of $0 in 2020 and 2019 34,536 66,680
Long-term investments 95,007 46,403
Certificate of deposit    
Debt Securities, Available-for-sale [Line Items]    
Current investments, amortized cost of $94,761 and $235,610 in 2020 and 2019, respectively, allowance for expected credit losses of $0 in 2020 and 2019 0 4,328
Sovereign Bonds    
Debt Securities, Available-for-sale [Line Items]    
Long-term investments 8,410 16,005
Agency Bonds    
Debt Securities, Available-for-sale [Line Items]    
Long-term investments 28,274 5,914
Municipal Bonds    
Debt Securities, Available-for-sale [Line Items]    
Current investments, amortized cost of $94,761 and $235,610 in 2020 and 2019, respectively, allowance for expected credit losses of $0 in 2020 and 2019 1,307 4,630
Long-term investments 1,110 2,322
Sovereign bonds    
Debt Securities, Available-for-sale [Line Items]    
Current investments, amortized cost of $94,761 and $235,610 in 2020 and 2019, respectively, allowance for expected credit losses of $0 in 2020 and 2019 $ 16,086 $ 6,294