Consolidated Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues:
Product	$ 676,991	$ 545,258	$ 519,603
Service	171,190	133,853	138,602
Total revenues	848,181	679,111	658,205
Costs and expenses:
Cost of product revenues	401,330	338,059	331,128
Cost of service revenues	100,114	83,460	78,519
Research and development	84,384	69,547	59,566
Selling, general and administrative	250,296	185,114	187,867
Acquisition costs	5,974
Capitalized legal fees charge	5,573
Gain on intellectual property sales		(3,148)
Restructuring charges	5,855	2,780	20,577
Impairment of property, plant and equipment	900	3,008
Total costs and expenses	854,426	678,820	677,657
Operating profit (loss) from continuing operations	(6,245)	291	(19,452)
Interest income	624	1,229	1,312
Interest expense	(2,868)	(1,296)	(995)
Earnings (loss) from continuing operations before income taxes	(8,489)	224	(19,135)
Income tax expense (benefit)	22,268	5,549	(8,263)
Loss from continuing operations	(30,757)	(5,325)	(10,872)
Loss from discontinued operations, net of tax			(971)
Net loss	$ (30,757)	$ (5,325)	$ (11,843)
Basic loss per share:
Continuing operations	$ (0.51)	$ (0.09)	$ (0.17)
Discontinued operations			$ (0.02)
Net loss per share	$ (0.51)	$ (0.09)	$ (0.19)
Diluted loss per share:
Continuing operations	$ (0.51)	$ (0.09)	$ (0.17)
Discontinued operations			$ (0.02)
Net loss per share	$ (0.51)	$ (0.09)	$ (0.19)
Shares used in computing basic loss per share	60,097,551	61,363,522	61,643,892
Shares used in computing diluted loss per share	60,097,551	61,363,522	61,643,892