Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jul. 02, 2011	Jul. 03, 2010	Jul. 02, 2011	Jul. 03, 2010
Revenues	$ 126,197	$ 134,577	$ 245,833	$ 261,296
Cost of revenues	49,985	43,684	97,463	86,813
Gross margin	76,212	90,893	148,370	174,483
Operating expenses:
Research and development	34,173	30,509	69,533	60,431
Selling, general and administrative	26,055	29,737	57,914	57,740
Operating expenses	60,228	60,246	127,447	118,171
Operating income	15,984	30,647	20,923	56,312
Other income (expense):
Interest income	473	633	1,044	1,299
Interest expense	(5)	(22)	(10)	(45)
Other income (expense), net	164	(586)	373	(883)
Income before income taxes	16,616	30,672	22,330	56,683
Provision for income taxes	3,244	9,625	10,918	14,557
Net income	$ 13,372	$ 21,047	$ 11,412	$ 42,126
Earnings per share:
Basic (in dollars per share)	$ 0.30	$ 0.46	$ 0.26	$ 0.92
Diluted (in dollars per share)	$ 0.29	$ 0.44	$ 0.25	$ 0.88
Weighted-average common shares outstanding:
Basic (in shares)	44,602	45,387	44,435	45,602
Diluted (in shares)	45,951	47,371	45,998	47,649