Balance Sheet Components (Schedule Of Available-For-Sale Short-Term) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 29, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 95,122	$ 104,754
Unrealized Gain	29	7
Unrealized Loss	0	(1)
Estimated Fair Value	95,151	104,760
U.S. Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	94,945	104,595
Unrealized Gain	29	7
Unrealized Loss	0	(1)
Estimated Fair Value	94,974	104,601
Certificates Of Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	177	159
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	$ 177	$ 159