Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Income Statement [Abstract]
Net sales	$ 119,033	$ 100,833	$ 219,239	$ 196,134
Cost of sales	81,563	67,894	151,786	132,148
Gross profit	37,470	32,939	67,453	63,986
Selling, general and administrative expenses	20,615	16,776	40,676	34,440
Income from operations	16,855	16,163	26,777	29,546
Interest expense, net	5,282	2,940	9,440	5,853
Debt extinguishment costs			3,431
Other expense, net		127		226
Income before income taxes	11,573	13,096	13,906	23,467
Income tax expense	4,223	6,316	5,077	10,035
Net income	$ 7,350	$ 6,780	$ 8,829	$ 13,432
Net income per common share:
Basic	$ 0.15	$ 0.14	$ 0.18	$ 0.28
Diluted	$ 0.15	$ 0.13	$ 0.17	$ 0.27
Weighted average shares outstanding:
Basic	48,710	48,077	48,702	47,899
Diluted	50,473	50,283	50,465	50,155
Comprehensive income	$ 7,350	$ 8,418	$ 8,829	$ 15,103