Goodwill and Acquired Intangible Assets - Schedule of Acquired Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 277,711	$ 275,011
Accumulated Amortization	(147,179)	(142,599)
Net Carrying Amount	130,532us-gaap_FiniteLivedIntangibleAssetsNet	132,412us-gaap_FiniteLivedIntangibleAssetsNet
Completed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	91,581	88,331
Accumulated Amortization	(48,800)	(45,537)
Net Carrying Amount	42,781	42,794
Customer-related intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	175,150	173,600
Accumulated Amortization	(94,055)	(91,160)
Net Carrying Amount	81,095	82,440
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,790	8,890
Accumulated Amortization	(2,563)	(4,224)
Net Carrying Amount	4,227	4,666
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,700	3,700
Accumulated Amortization	(1,271)	(1,188)
Net Carrying Amount	2,429	2,512
Acquired license rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	490	490
Accumulated Amortization	(490)	(490)
Net Carrying Amount	$ 0	$ 0

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)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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