Goodwill and Acquired Intangible Assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 323,231	$ 275,011
Accumulated amortization	(167,136)	(142,599)
Net carrying amount	156,095	132,412
Completed technologies
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	120,791	88,331
Accumulated amortization	(58,633)	(45,537)
Net carrying amount	62,158	42,794
Customer-related intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	191,710	173,600
Accumulated amortization	(102,872)	(91,160)
Net carrying amount	88,838	82,440
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	6,540	8,890
Accumulated amortization	(3,374)	(4,224)
Net carrying amount	3,166	4,666
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	3,700	3,700
Accumulated amortization	(1,767)	(1,188)
Net carrying amount	1,933	2,512
Acquired license rights
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	490	490
Accumulated amortization	(490)	(490)
Net carrying amount	$ 0	$ 0