Balance Sheet Components (Schedule Of Available-For-Sale Short-Term) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 28, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 100,120	$ 104,754
Unrealized Gain	31	7
Unrealized Loss	0	(1)
Estimated Fair Value	100,151	104,760
U.S. Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	99,954	104,595
Unrealized Gain	31	7
Unrealized Loss	0	(1)
Estimated Fair Value	99,985	104,601
Certificates Of Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	166	159
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	$ 166	$ 159