Balance Sheet Components (Schedule Of Property And Equipment, Net) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Total property and equipment, gross	$ 123,493	$ 126,536
Accumulated depreciation and amortization	(104,020)	(104,152)
Total property and equipment, net	19,473	22,384	$ 29,694
Computer Equipment [Member]
Total property and equipment, gross	10,557	11,161
Furniture, Fixtures And Leasehold Improvements [Member]
Total property and equipment, gross	20,827	18,317
Software [Member]
Total property and equipment, gross	28,663	30,396
Machinery and Equipment [Member]
Total property and equipment, gross	$ 63,446	$ 66,662