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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 03, 2021 | Apr. 04, 2020
Stock-based compensation costs |  |
Stock based compensation costs | $ 13,826 | $ 15,313
Income tax benefit | 1,665 | 1,366
Share based compensation costs after tax | 12,161 | 13,947
Total unrecognized compensation costs related to awards | $ 66,000 |
Weighted-average period of recognition of unrecognized compensation costs | 2 years |
Cost of revenues |  |
Stock-based compensation costs |  |
Stock based compensation costs | $ 337 | 335
Research and development |  |
Stock-based compensation costs |  |
Stock based compensation costs | 7,024 | 7,370
Selling, general and administrative |  |
Stock-based compensation costs |  |
Stock based compensation costs | $ 6,465 | $ 7,608

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