Goodwill and Acquired Intangible Assets - Schedule of Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 304,032	$ 323,231
Accumulated Amortization	(165,162)	(167,136)
Net Carrying Amount	138,870	156,095
Completed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	102,992	120,791
Accumulated Amortization	(47,543)	(58,633)
Net Carrying Amount	55,449	62,158
Customer-related intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	191,710	191,710
Accumulated Amortization	(111,375)	(102,872)
Net Carrying Amount	80,335	88,838
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,140	6,540
Accumulated Amortization	(3,542)	(3,374)
Net Carrying Amount	1,598	3,166
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,700	3,700
Accumulated Amortization	(2,212)	(1,767)
Net Carrying Amount	1,488	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