Goodwill and Acquired Intangibles (Details 1) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	$ 499,809	$ 526,537
Accumulated amortization	(283,632)	(267,723)
Acquired intangibles, net	216,177	258,814
Existing Technology [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	340,772	342,108
Accumulated amortization	(189,572)	(160,178)
Acquired intangibles, net	151,200	181,930
Agreements and Relationships [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	150,018	174,623
Accumulated amortization	(87,154)	(100,778)
Acquired intangibles, net	62,864	73,845
Tradenames Trademarks And Patents [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	9,019	9,806
Accumulated amortization	(6,906)	(6,767)
Acquired intangibles, net	$ 2,113	$ 3,039