Balance Sheet Components (Property And Equipment And Accumulated Depreciation) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 368,104	$ 357,196
Less: Accumulated depreciation	(234,631)	(223,591)
Property and equipment, net	133,473	133,605
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	110,411	102,867
Property and equipment, useful life (years)	3 years
Operations and other equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	96,180	96,361
Property and equipment, useful life (years)	5 years
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	35,589	36,439
Property and equipment, useful life (years)	3 years
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	22,595	21,011
Property and equipment, useful life (years)	3 years
Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	40,681	40,681
Property and equipment, useful life (years)	30 years
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	53,064	51,194
Capital work-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 9,584	$ 8,643