Balance Sheet Components (Schedule Of Property And Equipment, Net) (Details) - USD ($) $ in Thousands	Jun. 28, 2015	Dec. 31, 2014
Total property and equipment, gross	$ 121,285	$ 118,587
Accumulated depreciation and amortization	(95,694)	(88,893)
Total property and equipment, net	25,591	29,694
Computer Equipment [Member]
Total property and equipment, gross	10,002	9,779
Furniture, Fixtures And Leasehold Improvements [Member]
Total property and equipment, gross	17,984	19,379
Software [Member]
Total property and equipment, gross	29,908	29,294
Machinery And Equipment [Member]
Total property and equipment, gross	$ 63,391	$ 60,135