CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Income Statement [Abstract]
Net sales	$ 162,261	$ 144,172	$ 316,704	$ 278,995
Cost of goods sold	97,906	91,026	191,525	175,373
Gross profit	64,355	53,146	125,179	103,622
Selling, general and administrative expenses	33,601	27,419	64,517	53,488
Income from operations	30,754	25,727	60,662	50,134
Interest expense, net	53	38	101	52
Income from continuing operations before income taxes	30,701	25,689	60,561	50,082
Provision for income taxes	11,359	9,583	22,147	18,682
Income from continuing operations	19,342	16,106	38,414	31,400
Income from discontinued operations		3,636		3,920
Net income	$ 19,342	$ 19,742	$ 38,414	$ 35,320
Basic:
Continuing operations	$ 0.53	$ 0.45	$ 1.06	$ 0.87
Discontinued operations		$ 0.10		$ 0.11
Net income	$ 0.53	$ 0.55	$ 1.06	$ 0.98
Diluted:
Continuing operations	$ 0.53	$ 0.44	$ 1.05	$ 0.86
Discontinued operations		$ 0.10		$ 0.11
Net income	$ 0.53	$ 0.54	$ 1.05	$ 0.97
Weighted Average Shares Outstanding:
Basic	36,347	36,058	36,331	36,014
Diluted	36,685	36,636	36,658	36,573