Goodwill and Acquired Intangibles (Details 1) - USD ($) $ in Thousands	Jul. 01, 2017	Dec. 31, 2016
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	$ 499,642	$ 526,537
Accumulated amortization	(269,859)	(267,723)
Acquired intangibles, net	229,783	258,814
Existing Technology [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	340,584	342,108
Accumulated amortization	(179,507)	(160,178)
Acquired intangibles, net	161,077	181,930
Agreements and Relationships [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross carrying amount	150,039	174,623
Accumulated amortization	(83,753)	(100,778)
Acquired intangibles, net	66,286	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	(6,599)	(6,767)
Acquired intangibles, net	$ 2,420	$ 3,039