Condensed Consolidated Income Statements - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Condensed Consolidated Income Statements
Net sales	$ 196,109	$ 183,032	$ 537,654	$ 437,140
Type of Revenue	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of goods sold	$ 98,568	$ 100,840	$ 282,354	$ 235,662
Gross profit	97,541	82,192	255,300	201,478
Selling, general, and administrative expenses	69,417	57,473	190,746	161,381
Operating income	28,124	24,719	64,554	40,097
Interest expense	(7,755)	(8,351)	(24,474)	(23,961)
Other (expense) income	(214)	111	(325)	1,261
Income before income taxes	20,155	16,479	39,755	17,397
Income tax expense	(3,125)	(5,208)	(7,161)	(5,970)
Net income	$ 17,030	$ 11,271	$ 32,594	$ 11,427
Net income per share
Basic	$ 0.21	$ 0.14	$ 0.40	$ 0.14
Diluted	$ 0.21	$ 0.14	$ 0.39	$ 0.14
Weighted average common shares outstanding
Basic	81,147	81,479	81,238	81,460
Diluted	82,924	82,988	82,946	83,015