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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018
Stock-based compensation costs |  |  |  |
Stock based compensation costs | $ 13,669 | $ 12,119 | $ 26,253 | $ 24,311
Income tax (expense) benefit | (2,186) | 1,677 | 1,134 | 6,896
Share based compensation costs after tax | 15,855 | 10,442 | 25,119 | 17,415
Total unrecognized compensation costs related to awards | 89,100 |  | $ 89,100 |
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 | 326 | 294 | $ 645 | 590
Research and development |  |  |  |
Stock-based compensation costs |  |  |  |
Stock based compensation costs | 6,459 | 5,669 | 12,556 | 11,438
Selling, general and administrative |  |  |  |
Stock-based compensation costs |  |  |  |
Stock based compensation costs | $ 6,884 | $ 6,156 | $ 13,052 | $ 12,283

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