Goodwill and Acquired Intangible Assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 321,121	$ 323,231
Accumulated amortization	(171,658)	(167,136)
Net carrying amount	149,463	156,095
Completed technologies
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	119,091	120,791
Accumulated amortization	(50,823)	(58,633)
Net carrying amount	68,268	62,158
Customer-related intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	192,810	191,710
Accumulated amortization	(114,209)	(102,872)
Net carrying amount	78,601	88,838
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	5,030	6,540
Accumulated amortization	(3,775)	(3,374)
Net carrying amount	1,255	3,166
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	3,700	3,700
Accumulated amortization	(2,361)	(1,767)
Net carrying amount	1,339	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