Goodwill and Acquired Intangibles (Details 1) - USD ($) $ in Thousands	Apr. 01, 2017	Dec. 31, 2016
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	$ 499,394	$ 526,537
Accumulated amortization	(254,949)	(267,723)
Acquired intangibles, net	244,445	258,814
Existing Technology [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	340,345	342,108
Accumulated amortization	(168,706)	(160,178)
Acquired intangibles, net	171,639	181,930
Agreements and Relationships [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	150,031	174,623
Accumulated amortization	(79,952)	(100,778)
Acquired intangibles, net	70,079	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	9,018	9,806
Accumulated amortization	(6,291)	(6,767)
Acquired intangibles, net	$ 2,727	$ 3,039