Balance Sheet Components (Property And Equipment And Accumulated Depreciation) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 337,751	$ 336,037
Less: Accumulated depreciation	(208,432)	(204,356)
Property and equipment, net	129,319	131,681
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	88,192	84,193
Property and equipment, useful life (years)	3 years
Operations and other equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	99,402	100,207
Property and equipment, useful life (years)	5 years
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	38,740	39,073
Property and equipment, useful life (years)	3 years
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	18,669	18,208
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	45,922	45,393
Capital work-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 6,145	$ 8,282