Goodwill and Acquired Intangible Assets - Schedule of Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 275,011	$ 192,571
Accumulated amortization	(142,599)	(115,142)
Net carrying amount	132,412us-gaap_FiniteLivedIntangibleAssetsNet	77,429us-gaap_FiniteLivedIntangibleAssetsNet
Completed technologies
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	88,331	65,631
Accumulated amortization	(45,537)	(35,476)
Net carrying amount	42,794	30,155
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	173,600	115,100
Accumulated amortization	(91,160)	(75,563)
Net carrying amount	82,440	39,537
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	8,890	7,950
Accumulated amortization	(4,224)	(2,623)
Net carrying amount	4,666	5,327
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	3,700	3,400
Accumulated amortization	(1,188)	(990)
Net carrying amount	2,512	2,410
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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