Condensed Consolidated Statements of Income (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 Income
Revenues	$ 146,933	$ 149,461	$ 433,851	$ 410,833
Cost of revenues	58,772	62,968	169,545	166,442
Gross margin	88,161	86,493	264,306	244,391
Operating expenses:
Research and development	40,662	34,768	115,631	101,943
Selling, general and administrative	37,009	24,495	98,519	82,075
Operating expenses	77,671	59,263	214,150	184,018
Operating income	10,490	27,230	50,156	60,373
Other income (expense):
Interest income	129	243	616	1,103
Interest expense	(813)	(234)	(2,486)	(299)
Other income (expense), net	(23)	(161)	39	807
Income before income taxes	9,783	27,078	48,325	61,984
Provision for income taxes	3,252	17,054	9,148	17,131
Net income	$ 6,531	$ 10,024	$ 39,177	$ 44,853
Earnings per share:
Basic (in dollars per share)	$ 0.15	$ 0.24	$ 0.92	$ 1.06
Diluted (in dollars per share)	$ 0.15	$ 0.24	$ 0.90	$ 1.04
Weighted-average common shares outstanding:
Basic (in shares)	42,684	41,735	42,477	42,279
Diluted (in shares)	43,922	42,520	43,437	43,261