PROPERTY AND EQUIPMENT, Net (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property and equipment, net
Property and equipment, gross	$ 116,347	$ 82,112
Less: accumulated depreciation and amortization	(47,210)	(36,961)
Property and equipment, net	69,137	45,151
Land
Property and equipment, net
Property and equipment, gross	5,382	3,626
Leasehold improvements
Property and equipment, net
Property and equipment, gross	2,300	2,132
Furniture and fixtures
Property and equipment, net
Property and equipment, gross	2,087	2,000
Office and computer equipment
Property and equipment, net
Property and equipment, gross	8,981	6,727
Computer software
Property and equipment, net
Property and equipment, gross	1,135	9,303
Equipment
Property and equipment, net
Property and equipment, gross	48,427	33,286
Building
Property and equipment, net
Property and equipment, gross	21,998	3,211
Vehicles
Property and equipment, net
Property and equipment, gross	$ 26,037	$ 21,827

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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