Intangible Assets Gross Carrying Amount and Accumulated Amortization (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 748,148	$ 804,281
Accumulated Amortization	(608,239)	(608,441)
Intangible assets, net	139,909	195,840
Net	139,909us-gaap_FiniteLivedIntangibleAssetsNet	195,840us-gaap_FiniteLivedIntangibleAssetsNet
Intangible Assets, Gross (Excluding Goodwill)	748,148	804,281	802,540
Core-developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	405,434	428,890
Accumulated Amortization	(359,500)	(356,017)
Net	45,934	72,873
Customer contracts and relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	262,930	291,185
Accumulated Amortization	(172,755)	(173,952)
Net	90,175	117,233
Trademarks and trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	68,205	73,117
Accumulated Amortization	(64,905)	(67,449)
Net	3,300	5,668
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	11,579	11,089
Accumulated Amortization	(11,079)	(11,023)
Net	$ 500	$ 66

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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-Publisher FASB

-Name Accounting Standards Codification

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