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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 03, 2021 | Jul. 04, 2020 | Jul. 03, 2021 | Jul. 04, 2020
Stock-based compensation costs |  |  |  |
Stock based compensation costs | $ 11,252 | $ 11,818 | $ 22,620 | $ 24,461
Income tax benefit | 577 | 945 | 1,259 | 2,122
Share based compensation costs after tax | 10,675 | 10,873 | 21,361 | 22,339
Total unrecognized compensation costs related to awards | 110,800 |  | $ 110,800 |
Weighted-average period of recognition of unrecognized compensation costs |  |  | 2 years 4 months 24 days |
Cost of revenues |  |  |  |
Stock-based compensation costs |  |  |  |
Stock based compensation costs | 199 | 200 | $ 436 | 375
Research and development |  |  |  |
Stock-based compensation costs |  |  |  |
Stock based compensation costs | 5,488 | 5,612 | 11,118 | 11,534
Selling, general and administrative |  |  |  |
Stock-based compensation costs |  |  |  |
Stock based compensation costs | $ 5,565 | $ 6,006 | $ 11,066 | $ 12,552

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