Balance Sheet Components (Schedule Of Intangibles, Net) (Details) - USD ($) $ in Thousands	Oct. 01, 2017	Dec. 31, 2016
Intangible Assets [Line Items]
Gross	$ 134,144	$ 134,144
Accumulated Amortization	(106,617)	(96,245)
Finite-Lived Intangible Assets, Net	27,527	37,899
Technology [Member]
Intangible Assets [Line Items]
Gross	66,599	66,599
Accumulated Amortization	(61,620)	(57,381)
Finite-Lived Intangible Assets, Net	4,979	9,218
Customer Contracts And Relationships [Member]
Intangible Assets [Line Items]
Gross	56,500	56,500
Accumulated Amortization	(35,674)	(30,375)
Finite-Lived Intangible Assets, Net	20,826	26,125
Other [Member]
Intangible Assets [Line Items]
Gross	11,045	11,045
Accumulated Amortization	(9,323)	(8,489)
Finite-Lived Intangible Assets, Net	$ 1,722	$ 2,556