Goodwill and Identified Intangibles (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Identified intangibles:
Gross Carrying Amount	$ 228,254	$ 228,228
Accumulated Amortization	(132,951)	(110,158)
Net Carrying Amount	95,303	118,070
Goodwill, Gross Carrying Amount	212,443	211,878
Goodwill, Accumulated Amortization	0	0
Goodwill, Net Carrying Amount	212,443	211,878
Total goodwill and other intangibles, Gross Carrying Amount	440,697	440,106
Total goodwill and other intangibles, Accumulated Amortization	(132,951)	(110,158)
Total goodwill and other intangibles, Net Carrying Amount	307,746	329,948
Existing and core technology [Member]
Identified intangibles:
Gross Carrying Amount	136,163	127,146
Accumulated Amortization	(76,545)	(60,453)
Net Carrying Amount	59,618	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	67,099	67,098
Accumulated Amortization	(40,637)	(36,117)
Net Carrying Amount	26,462	30,981
Trademarks and tradenames [Member]
Identified intangibles:
Gross Carrying Amount	11,364	11,361
Accumulated Amortization	(7,293)	(6,060)
Net Carrying Amount	4,071	5,301
Supply agreements [Member]
Identified intangibles:
Gross Carrying Amount	3,419	3,414
Accumulated Amortization	(3,419)	(3,414)
Net Carrying Amount	0	0
Maintenance agreements and related relationships [Member]
Identified intangibles:
Gross Carrying Amount	7,100	7,100
Accumulated Amortization	(1,948)	(1,008)
Net Carrying Amount	5,152	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