Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Income Statement [Abstract]
Net sales	$ 300,620	$ 253,796	$ 791,532	$ 751,762
Cost of goods sold	192,819	166,872	519,786	490,199
Gross profit	107,801	86,924	271,746	261,563
Selling, general and administrative expenses	63,028	59,961	184,288	177,637
Income from operations	44,773	26,963	87,458	83,926
Other (expense) income, net	(17)	33	2,317	90
Income before income taxes	44,756	26,996	89,775	84,016
Provision for income taxes	10,497	5,688	18,856	17,803
Net income	$ 34,259	$ 21,308	$ 70,919	$ 66,213
Earnings per share:
Basic	$ 1.06	$ 0.66	$ 2.19	$ 2.03
Diluted	$ 1.06	$ 0.65	$ 2.19	$ 2.02
Weighted average shares outstanding:
Basic	32,281	32,522	32,317	32,656
Diluted	32,371	32,594	32,394	32,738