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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 03, 2020 | Sep. 28, 2019 | Oct. 03, 2020 | Sep. 28, 2019
Stock-based compensation costs |  |  |  |
Stock based compensation costs | $ 14,559 | $ 13,788 | $ 44,329 | $ 40,042
Income tax benefit | 884 | 817 | 3,010 | 1,951
Share based compensation costs after tax | 13,675 | 12,971 | 41,319 | 38,091
Total unrecognized compensation costs related to awards | 89,400 |  | $ 89,400 |
Weighted-average period of recognition of unrecognized compensation costs |  |  | 2 years 2 months 12 days |
Cost of revenues |  |  |  |
Stock-based compensation costs |  |  |  |
Stock based compensation costs | 390 | 344 | $ 1,101 | 989
Research and development |  |  |  |
Stock-based compensation costs |  |  |  |
Stock based compensation costs | 7,384 | 6,474 | 21,826 | 19,030
Selling, general and administrative |  |  |  |
Stock-based compensation costs |  |  |  |
Stock based compensation costs | $ 6,785 | $ 6,970 | $ 21,402 | $ 20,023

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