CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net sales	$ 455,140	$ 432,564	$ 379,834
Cost of sales	268,988	253,590	221,827
Gross profit	186,152	178,974	158,007
Operating expenses:
Selling, general and administrative	77,984	77,287	82,853
Research and development	33,784	33,385	33,830
Advertising	39,526	49,314	39,331
Depreciation and amortization	11,161	11,183	10,406
Total operating expenses	162,455	171,169	166,420
Income (loss) from operations	23,697	7,805	(8,413)
Other income (expense):
Interest income	136	203	556
Interest expense	(259)	(243)	(60)
Other, net	(4,809)	(1,790)	(1,959)
Total other income expense, net	(4,932)	(1,830)	(1,463)
Income (loss) before income taxes	18,765	5,975	(9,876)
Provision for (benefit from) income taxes	(1,137)	1,030	(7,188)
Net income (loss)	$ 19,902	$ 4,945	$ (2,688)
Net income (loss) per share:
Class A and B - basic and diluted	$ 0.30	$ 0.08	$ (0.04)
Weighted average shares used to calculate net income (loss) per share:
Class A and B - basic	65,406	64,368	63,914
Class A and B - diluted	66,332	65,627	63,914