Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 04, 2021	Mar. 29, 2020
Income Statement [Abstract]
Revenue	$ 239,027	$ 167,235
Cost of revenue	54,045	41,200
Gross margin	184,982	126,035
Research, development, and engineering expenses	34,105	35,946
Selling, general, and administrative expenses	72,424	69,138
Operating income	78,453	20,951
Foreign currency gain (loss)	(1,008)	(3,003)
Investment income	1,554	5,229
Other income (expense)	(168)	(183)
Income before income tax expense	78,831	22,994
Income tax expense	8,983	2,517
Net Income	$ 69,848	$ 20,477
Net income per weighted-average common and common-equivalent share:
Basic (usd per share)	$ 0.40	$ 0.12
Diluted (usd per share)	$ 0.39	$ 0.12
Weighted-average common and common-equivalent shares outstanding:
Basic (shares)	176,288	172,408
Diluted (shares)	179,971	175,602
Cash dividends per common share (usd per share)	$ 0.060	$ 0.055