Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Revenue	$ 81,720	$ 77,137	$ 248,196	$ 224,688
Costs and expenses:
Cost of products sold	33,866	31,551	100,062	90,704
Research and development	16,999	14,814	55,770	44,654
Selling, general and administrative	16,809	15,818	51,717	47,621
Restructuring charges	1,760	79	4,982	41
Costs and Expenses	69,434	62,262	212,531	183,020
Income from operations	12,286	14,875	35,665	41,668
Other income, net	248	669	1,179	1,916
Income before (benefit) provision for income taxes	12,534	15,544	36,844	43,584
(Benefit) provision for income taxes	(803)	176	(443)	391
Net income	$ 13,337	$ 15,368	$ 37,287	$ 43,193
Net income per share:
Basic	$ 0.11	$ 0.13	$ 0.32	$ 0.37
Diluted	$ 0.11	$ 0.13	$ 0.31	$ 0.36
Shares used in per share calculations:
Basic	117,926	117,257	117,990	116,332
Diluted	120,627	121,052	121,343	119,624