Balance Sheet Components (Schedule Of Goodwill By Segment) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012	Dec. 31, 2011
Goodwill [Line Items]
Goodwill	$ 85,944	$ 85,944
Retail [Member]
Goodwill [Line Items]
Goodwill	33,546	33,546
Commercial [Member]
Goodwill [Line Items]
Goodwill	32,043	32,043
Service Provider [Member]
Goodwill [Line Items]
Goodwill	$ 20,355	$ 20,355

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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