Condensed 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	$ 197,823	$ 199,084	$ 570,130	$ 508,606
Cost of sales	127,828	126,086	365,925	330,888
Gross profit	69,995	72,998	204,205	177,718
Selling, general and administrative expenses	44,564	44,055	132,604	105,293
Gains on sales of assets under APA				(2,551)
Income from operations	25,431	28,943	71,601	74,976
Interest expense, net	6,452	11,741	19,922	19,393
Debt extinguishment costs		296		3,375
Income before income taxes	18,979	16,906	51,679	52,208
Income tax expense	3,873	3,335	11,271	8,749
Net income	$ 15,106	$ 13,571	$ 40,408	$ 43,459
Net income per common share:
Basic	$ 0.26	$ 0.26	$ 0.69	$ 0.86
Diluted	$ 0.26	$ 0.26	$ 0.68	$ 0.83
Weighted average shares outstanding:
Basic	58,433	51,682	58,320	50,619
Diluted	59,142	53,068	59,192	52,378