Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
Apr. 04, 2020	Mar. 30, 2019
Stock-based compensation costs
Stock based compensation costs	$ 15,313	$ 12,584
Income tax benefit	1,366	3,320
Share based compensation costs after tax	13,947	9,264
Total unrecognized compensation costs related to awards	$ 98,400
Weighted-average period of recognition of unrecognized compensation costs	2 years 4 months 24 days
Cost of revenues
Stock-based compensation costs
Stock based compensation costs	$ 335	318
Research and development
Stock-based compensation costs
Stock based compensation costs	7,370	6,097
Selling, general and administrative
Stock-based compensation costs
Stock based compensation costs	$ 7,608	$ 6,169

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

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