CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Product sales	$ 126,444	$ 117,768	$ 374,648	$ 363,196
Cost of product sales	40,958	36,162	117,031	111,071
Gross profit	85,486	81,606	257,617	252,125
Operating expenses:
Selling, general and administrative	37,679	28,478	107,348	91,692
Research and development	25,469	20,382	71,488	59,886
Total operating expenses	63,148	48,860	178,836	151,578
Income from operations	22,338	32,746	78,781	100,547
Other income and (expense):
Interest expense and other			(4)	(3)
Interest income and other	569	579	1,899	1,401
Income before income taxes	22,907	33,325	80,676	101,945
Income tax expense	(4,003)	(9,070)	(20,413)	(31,396)
Net income	$ 18,904	$ 24,255	$ 60,263	$ 70,549
Net Income per share:
Basic (in dollars per share)	$ 0.33	$ 0.41	$ 1.05	$ 1.20
Diluted (in dollars per share)	$ 0.32	$ 0.41	$ 1.03	$ 1.18
Shares used to compute income per share:
Basic (in shares)	57,427	58,762	57,447	58,645
Diluted (in shares)	58,234	59,669	58,400	59,609