Balance Sheet Components (Schedule Of Available-For-Sale Short-Term) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 105,139	$ 227,799
Unrealized Gain	7	48
Unrealized Loss	(1)	(2)
Estimated Fair Value	105,145	227,845
Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	104,595	225,016
Unrealized Gain	7	48
Unrealized Loss	(1)	(2)
Estimated Fair Value	104,601	225,062
Certificates Of Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	159	2,783
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	159	2,783
Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	385	0
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	$ 385	$ 0