Balance Sheet Components (Schedule Of Property And Equipment, Net) (Details) - USD ($) $ in Thousands	Oct. 01, 2017	Dec. 31, 2016
Total property and equipment, gross	$ 121,344	$ 123,493
Accumulated depreciation and amortization	(101,116)	(104,020)
Total property and equipment, net	20,228	19,473
Computer Equipment [Member]
Total property and equipment, gross	10,725	10,557
Furniture, Fixtures And Leasehold Improvements [Member]
Total property and equipment, gross	22,599	20,827
Software [Member]
Total property and equipment, gross	28,973	28,663
Machinery And Equipment [Member]
Total property and equipment, gross	$ 59,047	$ 63,446