Balance Sheet Components (Schedule Of Property And Equipment, Net) (Details) - USD ($) $ in Thousands	Sep. 27, 2015	Dec. 31, 2014
Total property and equipment, gross	$ 123,835	$ 118,587
Accumulated depreciation and amortization	(99,884)	(88,893)
Total property and equipment, net	23,951	29,694
Computer Equipment [Member]
Total property and equipment, gross	10,399	9,779
Furniture, Fixtures And Leasehold Improvements [Member]
Total property and equipment, gross	18,202	19,379
Software [Member]
Total property and equipment, gross	30,140	29,294
Machinery And Equipment [Member]
Total property and equipment, gross	$ 65,094	$ 60,135