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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
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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

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