CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Income Statement [Abstract]
Net sales	$ 177,953	$ 156,411	$ 494,657	$ 435,406
Cost of goods sold	108,249	96,665	299,774	272,038
Gross profit	69,704	59,746	194,883	163,368
Selling, general and administrative expenses	34,034	28,615	98,551	82,103
Income from operations	35,670	31,131	96,332	81,265
Interest expense, net	47	38	148	90
Income from continuing operations before income taxes	35,623	31,093	96,184	81,175
Provision for income taxes	12,736	11,337	34,883	30,019
Income from continuing operations	22,887	19,756	61,301	51,156
Income from discontinued operations		586		4,506
Net income	$ 22,887	$ 20,342	$ 61,301	$ 55,662
Basic:
Continuing operations	$ 0.63	$ 0.54	$ 1.69	$ 1.41
Discontinued operations		$ 0.02		$ 0.13
Net income	$ 0.63	$ 0.56	$ 1.69	$ 1.54
Diluted:
Continuing operations	$ 0.62	$ 0.54	$ 1.67	$ 1.40
Discontinued operations		$ 0.02		$ 0.13
Net income	$ 0.62	$ 0.56	$ 1.67	$ 1.53
Weighted Average Shares Outstanding:
Basic	36,362	36,240	36,343	36,089
Diluted	36,632	36,622	36,610	36,489