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Summary of Significant Accounting Policies-Cash Flow Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Cash paid during the year for: |  |  |  |
Interest (net of amounts capitalized) | $ 211 | $ 193 | $ 551 |
Income taxes | 42,270 | 36,589 | 91,061 |
Operating lease liabilities | 6,676 | 0 | 0 |
Non-cash investing activities: |  |  |  |
ROU assets obtained in exchange for lease liabilities(1) | 26,484 | 0 | 0 |
Unpaid purchases of property, plant and equipment | 6,686 | 2,391 | 1,559 |
Unsettled common stock proceeds from option exercises | 14 | 4 | 161 |
Unsettled common stock repurchases | 0 | 0 | 1,988 |
Cash and cash equivalents | 567,687 | 552,490 | 315,302 |
Restricted cash | 388 | 151 | 181 |
Total cash, cash equivalents and restricted cash shown in the statement of cash flows | $ 568,075 | $ 552,641 | $ 315,483 | $ 308,198

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