Balance Sheet Components (Schedule Of Property And Equipment, Net) (Details) - USD ($) $ in Thousands	Apr. 02, 2017	Dec. 31, 2016
Total property and equipment, gross	$ 125,689	$ 123,493
Accumulated depreciation and amortization	(106,341)	(104,020)
Total property and equipment, net	19,348	19,473
Computer Equipment [Member]
Total property and equipment, gross	10,237	10,557
Furniture, Fixtures And Leasehold Improvements [Member]
Total property and equipment, gross	21,007	20,827
Software [Member]
Total property and equipment, gross	28,698	28,663
Machinery And Equipment [Member]
Total property and equipment, gross	$ 65,747	$ 63,446