Balance Sheet Components (Schedule Of Available-For-Sale Short-Term) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 29, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 140,903	$ 227,799
Unrealized Gain	31	48
Unrealized Loss	0	(2)
Estimated Fair Value	140,934	227,845
U.S. Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	140,738	225,016
Unrealized Gain	31	48
Unrealized Loss	0	(2)
Estimated Fair Value	140,769	225,062
Certificates Of Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	165	2,783
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	$ 165	$ 2,783