Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Income Statement [Abstract]
Revenue	$ 96,637	$ 71,158
Costs and expenses:
Cost of products sold	42,499	33,003
Research and development	21,239	18,114
Selling, general and administrative	18,749	16,498
Amortization of intangible assets	737	749
Restructuring charges	11	153
Costs and expenses	83,235	68,517
Income from operations	13,402	2,641
Other income (expense), net	309	(52)
Income before income taxes	13,711	2,589
Provision for income taxes	1,727	699
Net Income	$ 11,984	$ 1,890
Net Income per share:
Basic (in dollars per share)	$ 0.10	$ 0.02
Diluted (in dollars per share)	$ 0.10	$ 0.02
Shares used in per share calculations:
Basic (in shares)	116,436	115,391
Diluted (in shares)	118,917	116,714