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Stock-Based Compensation (Tables) | 9 Months Ended
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Oct. 03, 2020
Stock-Based Compensation |
Schedule of stock-based compensation costs recognized in the Condensed Consolidated Statements of Income | The following table presents details of stock-based compensation costs recognized in the Condensed Consolidated Statements of Income (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | October 3, | ​ | September 28, | ​ | October 3, | ​ | September 28, | ​
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019 | ​
Cost of revenues | ​ | $ | 390 | ​ | $ | 344 | ​ | $ | 1,101 | ​ | $ | 989 | ​
Research and development | ​ | ​ | 7,384 | ​ | ​ | 6,474 | ​ | ​ | 21,826 | ​ |  | 19,030 | ​
Selling, general and administrative | ​ | ​ | 6,785 | ​ | ​ | 6,970 | ​ | ​ | 21,402 | ​ |  | 20,023 | ​
​ | ​ | ​ | 14,559 | ​ | ​ | 13,788 | ​ | ​ | 44,329 | ​ |  | 40,042 | ​
Income tax benefit | ​ | ​ | 884 | ​ | ​ | 817 | ​ | ​ | 3,010 | ​ |  | 1,951 | ​
​ | ​ | $ | 13,675 | ​ | $ | 12,971 | ​ | $ | 41,319 | ​ | $ | 38,091 | ​

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