Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Income Statement [Abstract]
Net sales	$ 227,262	$ 221,625
Cost of goods sold	138,627	132,882
Gross profit	88,635	88,743
Selling, general and administrative expenses	48,641	43,701
Income from operations	39,994	45,042
Other income, net	152	64
Income before income taxes	40,146	45,106
Provision for income taxes	9,499	15,919
Net income	$ 30,647	$ 29,187
Earnings Per Share:
Basic	$ 0.93	$ 0.85
Diluted	$ 0.93	$ 0.85
Weighted Average Shares Outstanding:
Basic	32,917	34,385
Diluted	33,003	34,479