Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Condensed Consolidated Statements of Income
Revenues	$ 174,908	$ 164,856	$ 336,933	$ 328,561
Cost of revenues	66,614	67,428	133,108	134,764
Gross margin	108,294	97,428	203,825	193,797
Operating expenses:
Research and development	51,635	47,465	100,681	94,322
Selling, general and administrative	39,045	40,960	78,682	83,260
Operating expenses	90,680	88,425	179,363	177,582
Operating income	17,614	9,003	24,462	16,215
Other income (expense):
Interest income	278	166	549	358
Interest expense	(641)	(728)	(1,296)	(1,473)
Other, net	18	90	(373)	498
Income before income taxes	17,269	8,531	23,342	15,598
Provision for income taxes	1,710	956	1,975	1,645
Net income	$ 15,559	$ 7,575	$ 21,367	$ 13,953
Earnings per share:
Basic (in dollars per share)	$ 0.37	$ 0.18	$ 0.51	$ 0.33
Diluted (in dollars per share)	$ 0.37	$ 0.17	$ 0.51	$ 0.32
Weighted-average common shares outstanding:
Basic (in shares)	41,775	42,823	41,702	42,617
Diluted (in shares)	42,284	43,461	42,242	43,305