Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 04, 2020	Mar. 30, 2019
Income Statement [Abstract]
Net sales	$ 220,204	$ 173,737
Cost of sales	139,077	112,467
Gross profit	81,127	61,270
Selling, general and administrative expenses	54,220	44,014
Income from operations	26,907	17,256
Interest expense, net	7,169	6,714
Income before income taxes	19,738	10,542
Income tax expense	4,138	2,285
Net income	$ 15,600	$ 8,257
Net income per common share:
Basic	$ 0.27	$ 0.14
Diluted	$ 0.26	$ 0.14
Weighted average shares outstanding:
Basic	58,668	58,134
Diluted	59,121	59,220