Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013		Jun. 29, 2014	Jun. 30, 2013
Revenue
Product	$ 102,942	$ 79,698		$ 186,511	$ 154,370
Service	5,860	6,812		13,220	13,032
Total revenue	108,802	86,510		199,731	167,402
Cost of revenue
Product	22,578	17,910		39,864	34,374
Service	3,212	3,240		7,010	6,199
Total cost of revenue	25,790	21,150		46,874	40,573
Gross margin
Product	80,364	61,788		146,647	119,996
Service	2,648	3,572		6,210	6,833
Total gross margin	83,012	65,360		152,857	126,829
Research, development, and engineering expenses	13,622	11,887		26,124	23,208
Selling, general, and administrative expenses	38,668	33,300		73,568	65,467
Operating income	30,722	20,173		53,165	38,154
Foreign currency gain (loss)	(96)	76		(206)	139
Investment income	801	774		1,588	1,166
Other expense	(75)	(257)		(348)	(140)
Income before income tax expense	31,352	20,766		54,199	39,319
Income tax expense	5,404	3,946		9,745	6,916
Net income	$ 25,948	$ 16,820		$ 44,454	$ 32,403
Earnings per weighted-average common and common-equivalent share:
Basic (in dollars per share)	$ 0.30	$ 0.19	[1]	$ 0.51	$ 0.37	[1]
Diluted (in dollars per share)	$ 0.29	$ 0.19	[1]	$ 0.50	$ 0.37	[1]
Weighted-average common and common-equivalent shares outstanding:
Basic (in shares)	86,782	87,044	[1]	86,830	86,784	[1]
Diluted (in shares)	88,965	88,714	[1]	89,112	88,502	[1]

[1] Prior period results have been adjusted to reflect the two-for-one stock split effected in the form of a stock dividend which occurred in the third quarter of 2013.