Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 04, 2020	Jun. 29, 2019	Jul. 04, 2020	Jun. 29, 2019
Stock-based compensation costs
Stock based compensation costs	$ 14,457	$ 13,669	$ 29,770	$ 26,253
Income tax (expense) benefit	760	(2,186)	2,125	1,134
Share based compensation costs after tax	13,697	15,855	27,645	25,119
Total unrecognized compensation costs related to awards	100,100		$ 100,100
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	376	326	$ 711	645
Research and development
Stock-based compensation costs
Stock based compensation costs	7,072	6,459	14,442	12,556
Selling, general and administrative
Stock-based compensation costs
Stock based compensation costs	$ 7,009	$ 6,884	$ 14,617	$ 13,052

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

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