Balance Sheet Components (Schedule Of Goodwill By Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Roll Forward]
Goodwill (period start)	$ 81,721	$ 155,916
Goodwill impairment charges	0	(74,196)	$ 0
Goodwill (period end)	81,721	81,721	155,916
Retail [Member]
Goodwill [Roll Forward]
Goodwill (period start)	45,442	45,442
Goodwill impairment charges	0	0
Goodwill (period end)	45,442	45,442	45,442
Commercial [Member]
Goodwill [Roll Forward]
Goodwill (period start)	36,279	36,279
Goodwill impairment charges	0	0
Goodwill (period end)	36,279	36,279	36,279
Service Provider [Member]
Goodwill [Roll Forward]
Goodwill (period start)	0	74,196
Goodwill impairment charges	0	(74,196)
Goodwill (period end)	$ 0	$ 0	$ 74,196