CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Product revenue	$ 376,598	$ 396,324	$ 421,088
Service revenue	85,342	80,547	69,786
Total net revenue	461,940	476,871	490,874
Product cost of revenue	196,766	214,473	216,640
Service cost of revenue	44,729	41,866	37,418
Total cost of revenue	241,495	256,339	254,058
Gross profit	220,445	220,532	236,816
Operating expenses:
Research and development	99,938	102,627	99,314
Selling, general and administrative	134,014	127,117	127,077
Amortization of intangibles	8,096	8,705	8,918
Restructuring and related charges	1,421	0	0
Total operating expenses	243,469	238,449	235,309
Income (loss) from operations	(23,024)	(17,917)	1,507
Interest income, net	219	515	374
Other income (expense), net	(347)	(293)	(514)
Income (loss) from continuing operations before income taxes	(23,152)	(17,695)	1,367
Benefit from income taxes	(44,741)	(1,506)	(651)
Income (loss) from continuing operations	21,589	(16,189)	2,018
Income from discontinued operations, net of taxes (including gain on disposal of $14,663, net of taxes, for the year ended December 31, 2013)	15,438	5,252	6,761
Net income (loss)	$ 37,027	$ (10,937)	$ 8,779
Basic net income (loss) per share from:
Continuing operations, basic (usd per share)	$ 0.20	$ (0.14)	$ 0.02
Discontinued operations, basic (usd per share)	$ 0.14	$ 0.05	$ 0.06
Net income (loss), basic (usd per share)	$ 0.35	$ (0.09)	$ 0.08
Diluted net income (loss) per share from:
Continuing operations, diluted (usd per share)	$ 0.20	$ (0.14)	$ 0.02
Discontinued operations, diluted (usd per share)	$ 0.14	$ 0.05	$ 0.06
Net income (loss), diluted (usd per share)	$ 0.34	$ (0.09)	$ 0.08
Shares used in per share calculations:
Basic (in shares)	106,529	116,457	115,175
Diluted (in shares)	107,808	116,457	116,427