Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Income Statement [Abstract]
Net revenues	$ 243,572	$ 235,963	$ 365,040	$ 349,780
Cost of goods sold	157,719	151,117	249,687	240,253
Gross profit	85,853	84,846	115,353	109,527
Selling, general and administrative expense	47,415	44,592	87,318	81,463
Restructuring costs (recoveries)	150	(20)	155	(97)
Impairment of long-lived assets	0	28	0	28
Income from operations	38,288	40,246	27,880	28,133
Interest expense	224	273	444	440
Income before income taxes	38,064	39,973	27,436	27,693
Provision (benefit) for income taxes	15,448	(4,770)	11,067	(4,705)
Net income	$ 22,616	$ 44,743	$ 16,369	$ 32,398
Net income per share:
Basic	$ 0.97	$ 1.97	$ 0.71	$ 1.43
Diluted	$ 0.95	$ 1.92	$ 0.69	$ 1.39
Weighted average common and common equivalent shares outstanding:
Basic	23,249	22,711	23,131	22,675
Diluted	23,720	23,258	23,652	23,250