Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Income Statement [Abstract]
Net revenues	$ 191,924	$ 180,269	$ 556,964	$ 530,049
Cost of goods sold	131,628	125,578	381,315	365,831
Gross profit	60,296	54,691	175,649	164,218
Selling, general and administrative expense	43,121	41,789	130,439	123,252
Restructuring costs (recoveries)	4	(10)	159	(107)
Impairment of long-lived assets	0	22	0	50
Income from operations	17,171	12,890	45,051	41,023
Interest expense	217	226	661	666
Income before income taxes	16,954	12,664	44,390	40,357
Provision (benefit) for income taxes	6,682	1,448	17,749	(3,257)
Net income	$ 10,272	$ 11,216	$ 26,641	$ 43,614
Net income per common and common equivalent share:
Basic	$ 0.44	$ 0.49	$ 1.15	$ 1.92
Diluted	$ 0.43	$ 0.48	$ 1.12	$ 1.88
Weighted average common and common equivalent shares outstanding:
Basic	23,383	22,788	23,215	22,713
Diluted	23,813	23,268	23,706	23,256