Balance Sheet Components (Schedule Of Accounts Receivable And Related Allowances) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	$ 309,926	$ 296,239
Allowance for Doubtful Accounts Receivable, Current	(19,284)	(20,550)
Total accounts receivable, net	290,642	275,689
Allowance for Doubtful Accounts, Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Doubtful Accounts Receivable, Current	(1,255)	(1,255)
Allowance for Sales Returns [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Doubtful Accounts Receivable, Current	(15,904)	(17,489)
Allowance For Price Protection [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Doubtful Accounts Receivable, Current	$ (2,125)	$ (1,806)