Balance Sheet Components (Schedule Of Property And Equipment, Net) (Details) - USD ($) $ in Thousands	Jul. 02, 2017	Dec. 31, 2016
Total property and equipment, gross	$ 117,360	$ 123,493
Accumulated depreciation and amortization	(98,531)	(104,020)
Total property and equipment, net	18,829	19,473
Computer Equipment [Member]
Total property and equipment, gross	10,174	10,557
Furniture, Fixtures And Leasehold Improvements [Member]
Total property and equipment, gross	21,324	20,827
Software [Member]
Total property and equipment, gross	28,789	28,663
Machinery And Equipment [Member]
Total property and equipment, gross	$ 57,073	$ 63,446