Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Income Statement [Abstract]
Net sales	$ 253,796	$ 247,954	$ 751,762	$ 713,363
Cost of goods sold	166,872	152,957	490,199	437,029
Gross profit	86,924	94,997	261,563	276,334
Selling, general and administrative expenses	59,961	51,264	177,637	149,828
Income from operations	26,963	43,733	83,926	126,506
Other income, net	33	61	90	286
Income before income taxes	26,996	43,794	84,016	126,792
Provision for income taxes	5,688	9,777	17,803	27,789
Net income	$ 21,308	$ 34,017	$ 66,213	$ 99,003
Earnings Per Share:
Basic	$ 0.66	$ 1.03	$ 2.03	$ 2.98
Diluted	$ 0.65	$ 1.03	$ 2.02	$ 2.98
Weighted Average Shares Outstanding:
Basic	32,522	32,985	32,656	33,177
Diluted	32,594	33,095	32,738	33,267