Balance Sheet Components (Schedule Of Property And Equipment, Net) (Details) - USD ($) $ in Thousands	Apr. 03, 2016	Dec. 31, 2015
Total property and equipment, gross	$ 128,446	$ 126,536
Accumulated depreciation and amortization	(107,759)	(104,152)
Total property and equipment, net	20,687	22,384
Computer Equipment [Member]
Total property and equipment, gross	11,502	11,161
Furniture, Fixtures And Leasehold Improvements [Member]
Total property and equipment, gross	18,427	18,317
Software [Member]
Total property and equipment, gross	30,957	30,396
Machinery And Equipment [Member]
Total property and equipment, gross	$ 67,560	$ 66,662