Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2020	Mar. 29, 2019
Income Statement [Abstract]
Net sales	$ 220,028	$ 137,831
Cost of sales	191,254	117,608
Gross profit	28,774	20,223
Operating expenses:
Research and development	3,322	2,391
Selling, general, and administrative	16,618	11,758
Amortization of intangible assets	3,334	3,137
Total operating expenses	23,274	17,286
Operating income	5,500	2,937
Interest expense	2,374	2,768
Other expense (income), net	(31)	24
Income before income taxes	3,157	145
Income tax benefit	(242)	(1,373)
Net income	$ 3,399	$ 1,518
Net income per share Basic	$ 0.15	$ 0.07
Net income per share Diluted	$ 0.15	$ 0.07
Shares used to compute net income per share:
Shares used to compute net income per share, Basic	22,737,163	22,269,827
Shares used to compute net income per share, Diluted	23,181,127	22,536,209