Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Income Statement [Abstract]
Net sales	$ 196,187	$ 162,261	$ 379,699	$ 316,704
Cost of goods sold	123,226	97,906	235,096	191,525
Gross profit	72,961	64,355	144,603	125,179
Selling, general and administrative expenses	36,261	33,601	70,956	64,517
Income from operations	36,700	30,754	73,647	60,662
Interest expense, net	63	53	102	101
Income before income taxes	36,637	30,701	73,545	60,561
Provision for income taxes	13,393	11,359	26,750	22,147
Net income	$ 23,244	$ 19,342	$ 46,795	$ 38,414
Earnings Per Share:
Basic	$ 0.64	$ 0.53	$ 1.29	$ 1.06
Diluted	$ 0.64	$ 0.53	$ 1.28	$ 1.05
Weighted Average Shares Outstanding:
Basic	36,315	36,347	36,344	36,331
Diluted	36,471	36,685	36,514	36,658