Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
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

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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