Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Revenues:
Product	$ 150,214	$ 165,294	$ 445,042	$ 484,781
Service	42,607	46,511	128,408	126,625
Total revenues	192,821	211,805	573,450	611,406
Costs and expenses:
Cost of product revenues	90,369	97,587	281,681	291,825
Cost of service revenues	22,468	26,363	66,663	72,115
Research and development	20,266	22,047	60,706	62,720
Selling, general and administrative	54,565	63,610	181,984	183,906
Gain on sale of assets	(2,534)	0	(5,189)	0
Restructuring costs	(1,130)	644	4,468	5,756
Impairment of goodwill	(200)	0	41,314	0
Acquisition costs	0	554	0	5,766
Total costs and expenses	183,804	210,805	631,627	622,088
Operating profit (loss)	9,017	1,000	(58,177)	(10,682)
Interest income	107	162	308	565
Interest expense	(683)	(572)	(2,315)	(1,964)
Earnings (loss) before income taxes	8,441	590	(60,184)	(12,081)
Income tax expense (benefit)	1,238	(114)	212,225	(2,911)
Net earnings (loss)	$ 7,203	$ 704	$ (272,409)	$ (9,170)
Loss per common share:
Basic earnings (loss) per share	$ 0.12	$ 0.01	$ (4.52)	$ (0.15)
Diluted earnings (loss) per share	$ 0.12	$ 0.01	$ (4.52)	$ (0.15)
Shares used in computing:
Basic earnings (loss) per share	60,451	59,796	60,243	59,959
Diluted earnings (loss) per share	60,579	59,897	60,243	59,959