Balance Sheet Components (Property And Equipment And Accumulated Depreciation) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 344,419	$ 336,037
Less: Accumulated depreciation	(217,156)	(204,356)
Property and equipment, net	127,263	131,681
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	87,967	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	98,539	100,207
Property and equipment, useful life (years)	5 years
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	39,242	39,073
Property and equipment, useful life (years)	3 years
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	20,594	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	49,681	45,393
Capital work-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 7,715	$ 8,282