Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Revenues:
Product	$ 150,398	$ 159,984	$ 307,877	$ 298,000
Service	41,743	40,967	83,654	82,629
Total revenues	192,141	200,951	391,531	380,629
Costs and expenses:
Cost of product revenues	93,134	100,920	194,619	192,998
Cost of service revenues	21,545	20,834	43,283	42,509
Research and development, net	22,187	20,431	43,212	40,440
Selling, general and administrative	62,431	61,412	129,056	127,419
Gain on sale of assets	0	(1,255)	0	(2,655)
Restructuring costs	0	5,598	115	5,598
Impairment of goodwill	0	32,369	0	47,294
Total costs and expenses	199,297	240,309	410,285	453,603
Operating loss	(7,156)	(39,358)	(18,754)	(72,974)
Interest income	53	80	56	201
Interest expense	(565)	(882)	(1,326)	(1,632)
Loss before income taxes	(7,668)	(40,160)	(20,024)	(74,405)
Income tax expense	1,917	3,142	3,078	210,987
Net loss	$ (9,585)	$ (43,302)	$ (23,102)	$ (285,392)
Loss per share:
Basic (in dollars per share)	$ (0.16)	$ (0.72)	$ (0.38)	$ (4.75)
Diluted (in dollars per share)	$ (0.16)	$ (0.72)	$ (0.38)	$ (4.75)
Shares used in computing loss per share:
Basic (in shares)	60,841	60,251	60,417	60,140
Diluted (in shares)	60,841	60,251	60,417	60,140