Goodwill and Acquired Intangible Assets - Schedule of Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 323,231	$ 323,231
Accumulated Amortization	(173,852)	(167,136)
Net Carrying Amount	149,379	156,095
Completed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	120,791	120,791
Accumulated Amortization	(61,792)	(58,633)
Net Carrying Amount	58,999	62,158
Customer-related intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	191,710	191,710
Accumulated Amortization	(105,705)	(102,872)
Net Carrying Amount	86,005	88,838
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,540	6,540
Accumulated Amortization	(3,949)	(3,374)
Net Carrying Amount	2,591	3,166
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,700	3,700
Accumulated Amortization	(1,916)	(1,767)
Net Carrying Amount	1,784	1,933
Acquired license rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	490	490
Accumulated Amortization	(490)	(490)
Net Carrying Amount	$ 0	$ 0