Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Revenue	$ 332,525	$ 279,256	$ 318,366
Costs and expenses:
Cost of products sold	154,281	128,499	129,769
Research and development	80,966	77,610	71,855
Selling, general and administrative	67,144	72,317	68,838
Acquisition related charges, including amortization of intangible assets	2,960	4,178	536
Restructuring charges	388	6,018	6,079
Costs and expenses	305,739	288,622	277,077
Income (loss) from operations	26,786	(9,366)	41,289
Other (expense) income, net	(300)	505	1,434
Income (loss) before income taxes	26,486	(8,861)	42,723
Provision (benefit) for income taxes	4,165	20,745	(35,509)
Net income (loss)	$ 22,321	$ (29,606)	$ 78,232
Net (loss) income per share:
Basic (in dollars per share)	$ 0.19	$ (0.25)	$ 0.66
Diluted (in dollars per share)	$ 0.19	$ (0.25)	$ 0.65
Shares used in per share calculations:
Basic (in shares)	115,701	117,194	117,875
Diluted (in shares)	117,081	117,194	121,139