Balance Sheet Components (Schedule Of Property And Equipment, Net) (Details) - USD ($) $ in Thousands	Jul. 03, 2016	Dec. 31, 2015
Total property and equipment, gross	$ 131,088	$ 126,536
Accumulated depreciation and amortization	(111,815)	(104,152)
Total property and equipment, net	19,273	22,384
Computer Equipment [Member]
Total property and equipment, gross	11,542	11,161
Furniture, Fixtures And Leasehold Improvements [Member]
Total property and equipment, gross	19,072	18,317
Software [Member]
Total property and equipment, gross	31,287	30,396
Machinery And Equipment [Member]
Total property and equipment, gross	$ 69,187	$ 66,662