Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 254,175	$ 238,147	$ 497,966	$ 465,409
Cost of goods sold	167,027	145,446	323,327	284,072
Gross profit	87,148	92,701	174,639	181,337
Selling, general and administrative expenses	59,925	49,921	117,676	98,563
Income from operations	27,223	42,780	56,963	82,774
Other income, net	27	73	57	224
Income before income taxes	27,250	42,853	57,020	82,998
Provision for income taxes	5,751	8,514	12,115	18,013
Net income	$ 21,499	$ 34,339	$ 44,905	$ 64,985
Earnings Per Share:
Basic	$ 0.66	$ 1.04	$ 1.37	$ 1.95
Diluted	$ 0.66	$ 1.03	$ 1.37	$ 1.95
Weighted Average Shares Outstanding:
Basic	32,588	33,146	32,722	33,273
Diluted	32,676	33,226	32,811	33,355