Net Income Per Share (Schedule of Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Numerator:
Net income	$ 25,535	$ 12,529	$ 27,345	$ 26,211
Denominator:
Weighted average common shares - basic	30,037	30,933	29,746	31,221
Potentially dilutive common share equivalent	704	886	595	1,106
Weighted average common shares - dilutive	30,741	31,819	30,341	32,327
Basic net income per share	$ 0.85	$ 0.41	$ 0.92	$ 0.84
Diluted net income per share	$ 0.83	$ 0.39	$ 0.90	$ 0.81
Anti-dilutive employee stock-based awards, excluded	1,221	1,587	1,175	625