Balance Sheet Components (Schedule Of Intangibles, Net) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Purchased Intangible Assets [Line Items]
Gross	$ 134,144	$ 128,144
Accumulated Amortization	(96,245)	(79,197)
Finite-lived intangibles, net	37,899	48,947
Technology [Member]
Purchased Intangible Assets [Line Items]
Gross	66,599	61,099
Accumulated Amortization	(57,381)	(48,485)
Finite-lived intangibles, net	9,218	12,614
Customer Contracts And Relationships [Member]
Purchased Intangible Assets [Line Items]
Gross	56,500	56,500
Accumulated Amortization	(30,375)	(23,290)
Finite-lived intangibles, net	26,125	33,210
Other [Member]
Purchased Intangible Assets [Line Items]
Gross	11,045	10,545
Accumulated Amortization	(8,489)	(7,422)
Finite-lived intangibles, net	$ 2,556	$ 3,123