Consolidated Statement of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2020	$ 1,262,202	$ 352	$ 807,739	$ 487,912	$ (33,801)
Beginning Balance (in shares) at Dec. 31, 2020		175,790
Increase (Decrease) in Stockholders' Equity
Net issuance of common stock under stock plans	34,744	$ 1	34,743
Net issuance of common stock under stock plans (in shares)		898
Repurchase of common stock	(6,479)	$ 0		(6,479)
Repurchase of common stock (in shares)		(80)
Stock-based compensation expense	12,009		12,009
Payment of dividends	(10,595)			(10,595)
Net income	69,848			69,848
Net unrealized gain (loss) on available-for-sale investments, net of tax	(1,958)				(1,958)
Reclassification of net realized (gain) loss on the sale of available-for-sale investments	0
Foreign currency translation adjustment	(2,770)				(2,770)
Ending Balance at Apr. 04, 2021	1,357,001	$ 353	854,491	540,686	(38,529)
Ending Balance (in shares) at Apr. 04, 2021		176,608
Beginning Balance at Dec. 31, 2021	$ 1,430,093	$ 351	914,802	562,882	(47,942)
Beginning Balance (in shares) at Dec. 31, 2021	175,481	175,481
Increase (Decrease) in Stockholders' Equity
Net issuance of common stock under stock plans	$ 3,594	$ 0	3,594
Net issuance of common stock under stock plans (in shares)		136
Repurchase of common stock	(130,405)	$ (4)		(130,401)
Repurchase of common stock (in shares)		(1,879)
Stock-based compensation expense	15,056		15,056
Payment of dividends	(11,303)			(11,303)
Net income	67,333			67,333
Net unrealized gain (loss) on available-for-sale investments, net of tax	(13,548)				(13,548)
Reclassification of net realized (gain) loss on the sale of available-for-sale investments	36				36
Foreign currency translation adjustment	(2,111)				(2,111)
Ending Balance at Apr. 03, 2022	$ 1,358,745	$ 347	$ 933,452	$ 488,511	$ (63,565)
Ending Balance (in shares) at Apr. 03, 2022	173,738	173,738