Balance Sheet Components (Property And Equipment And Accumulated Depreciation) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2012 Y	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 310,298	$ 306,038
Less: Accumulated depreciation	(185,654)	(169,685)
Property and equipment, net	124,644	136,353
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	70,641	67,090
Property and equipment, useful life (years)	3
Operations And Other Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	100,308	100,306
Property and equipment, useful life (years)	5
Software, including internal-use software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	36,264	35,356
Property and equipment, useful life (years)	3
Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	16,842	17,310
Property and equipment, useful life (years)	3
Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	40,681	40,681
Property and equipment, useful life (years)	30
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	43,008	44,473
Property and equipment useful life over life of lease (years)	Over life of lease
Capital work-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,554	$ 822

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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