Balance Sheet Components (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property and equipment:
Property and equipment, gross	$ 464,804	$ 403,860
Less accumulated depreciation and amortization	250,835	194,763
Property and equipment, net	213,969	209,097
Land
Property and equipment:
Property and equipment, gross	20,940	20,940
Buildings
Property and equipment:
Property and equipment, gross	12,001	11,969
Furniture and fixtures
Property and equipment:
Property and equipment, gross	49,153	41,535
Transportation equipment
Property and equipment:
Property and equipment, gross	3,195	2,659
Computer equipment
Property and equipment:
Property and equipment, gross	164,163	139,788
Leasehold improvements
Property and equipment:
Property and equipment, gross	207,424	182,369
Construction in progress
Property and equipment:
Property and equipment, gross	$ 7,928	$ 4,600

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 of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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