Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Earnings Per Share
Net income	$ 13,509	$ 2,244
Shares used in computing basic earnings per share	44,160	43,642
Effect of dilutive securities:
Stock-based awards and convertible debt	1,672	746
Shares used in computing diluted earnings per share	45,832	44,388
Earnings per share:
Basic (in dollars per share)	$ 0.31	$ 0.05
Diluted (in dollars per share)	$ 0.29	$ 0.05
Shares attributable to dilutive effect of conversion of debt securities	1,100	300