Goodwill and Acquired Intangible Assets - Schedule of Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 320,181	$ 321,121
Accumulated Amortization	(178,287)	(171,658)
Net Carrying Amount	141,894	149,463
Completed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	119,091	119,091
Accumulated Amortization	(54,061)	(50,823)
Net Carrying Amount	65,030	68,268
Customer-related intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	192,810	192,810
Accumulated Amortization	(117,866)	(114,209)
Net Carrying Amount	74,944	78,601
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,090	5,030
Accumulated Amortization	(3,395)	(3,775)
Net Carrying Amount	695	1,255
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,700	3,700
Accumulated Amortization	(2,475)	(2,361)
Net Carrying Amount	1,225	1,339
Acquired license rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	490	490
Accumulated Amortization	(490)	(490)
Net Carrying Amount	$ 0	$ 0