Balance Sheet Components (Schedule Of Intangibles, Net) (Details) - USD ($) $ in Thousands	Apr. 02, 2017	Dec. 31, 2016
Intangible Assets [Line Items]
Gross	$ 134,144	$ 134,144
Accumulated Amortization	(100,706)	(96,245)
Finite-Lived Intangible Assets, Net	33,438	37,899
Technology [Member]
Intangible Assets [Line Items]
Gross	66,599	66,599
Accumulated Amortization	(59,769)	(57,381)
Finite-Lived Intangible Assets, Net	6,830	9,218
Customer Contracts And Relationships [Member]
Intangible Assets [Line Items]
Gross	56,500	56,500
Accumulated Amortization	(32,147)	(30,375)
Finite-Lived Intangible Assets, Net	24,353	26,125
Other [Member]
Intangible Assets [Line Items]
Gross	11,045	11,045
Accumulated Amortization	(8,790)	(8,489)
Finite-Lived Intangible Assets, Net	$ 2,255	$ 2,556