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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 28, 2019
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
​ | ​ | September 28, | ​ | September 29, | ​ | September 28, | ​ | September 29,
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018
Cost of revenues | ​ | $ | 344 | ​ | $ | 324 | ​ | $ | 989 | ​ | $ | 914
Research and development | ​ | ​ | 6,474 | ​ | ​ | 6,016 | ​ | ​ | 19,030 | ​ |  | 17,454
Selling, general and administrative | ​ | ​ | 6,970 | ​ | ​ | 6,242 | ​ | ​ | 20,023 | ​ |  | 18,525
​ | ​ | ​ | 13,788 | ​ | ​ | 12,582 | ​ | ​ | 40,042 | ​ |  | 36,893
Income tax benefit | ​ | ​ | 817 | ​ | ​ | 619 | ​ | ​ | 1,951 | ​ |  | 7,515
​ | ​ | $ | 12,971 | ​ | $ | 11,963 | ​ | $ | 38,091 | ​ | $ | 29,378

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