Goodwill and Identified Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Identified intangibles:
Gross Carrying Amount	$ 228,227	$ 228,228
Accumulated Amortization	(140,576)	(110,158)
Net Carrying Amount	87,651	118,070
Developed core technology [Member]
Identified intangibles:
Gross Carrying Amount	136,145	127,146
Accumulated Amortization	(81,951)	(60,453)
Net Carrying Amount	54,194	66,693
In-process Technology [Member]
Identified intangibles:
Gross Carrying Amount	0	9,000
Accumulated Amortization	0	0
Net Carrying Amount	0	9,000
Customer relationships/contracts [Member]
Identified intangibles:
Gross Carrying Amount	67,098	67,098
Accumulated Amortization	(42,142)	(36,117)
Net Carrying Amount	24,956	30,981
Trademarks and Tradenames [Member]
Identified intangibles:
Gross Carrying Amount	11,361	11,361
Accumulated Amortization	(7,700)	(6,060)
Net Carrying Amount	3,661	5,301
Supply agreements [Member]
Identified intangibles:
Gross Carrying Amount	3,414	3,414
Accumulated Amortization	(3,414)	(3,414)
Net Carrying Amount	0	0
Maintenance agreements and related relationships [Member]
Identified intangibles:
Gross Carrying Amount	7,100	7,100
Accumulated Amortization	(2,260)	(1,008)
Net Carrying Amount	4,840	6,092
Software license, intellectual property and assembled workforce [Member]
Identified intangibles:
Gross Carrying Amount	309	309
Accumulated Amortization	(309)	(306)
Net Carrying Amount	0	3
Order backlog [Member]
Identified intangibles:
Gross Carrying Amount	2,800	2,800
Accumulated Amortization	(2,800)	(2,800)
Net Carrying Amount	$ 0	$ 0