Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Condensed Consolidated Statements of Income
Revenues	$ 178,083	$ 156,194	$ 515,016	$ 484,755
Cost of revenues	69,880	62,759	202,988	197,523
Gross margin	108,203	93,435	312,028	287,232
Operating expenses:
Research and development	48,437	46,483	149,118	140,805
Selling, general and administrative	38,034	35,729	116,716	118,989
Operating expenses	86,471	82,212	265,834	259,794
Operating income	21,732	11,223	46,194	27,438
Other income (expense):
Interest income	331	186	880	544
Interest expense	(643)	(687)	(1,939)	(2,160)
Other, net	(58)	(280)	(431)	218
Income before income taxes	21,362	10,442	44,704	26,040
Provision for income taxes	1,344	467	3,319	2,112
Net income	$ 20,018	$ 9,975	$ 41,385	$ 23,928
Earnings per share:
Basic (in dollars per share)	$ 0.48	$ 0.24	$ 0.99	$ 0.56
Diluted (in dollars per share)	$ 0.47	$ 0.23	$ 0.98	$ 0.55
Weighted-average common shares outstanding:
Basic (in shares)	41,614	42,331	41,673	42,522
Diluted (in shares)	42,307	42,795	42,263	43,135