PROPERTY AND EQUIPMENT, Net (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Property and equipment, net
Property and equipment, gross	$ 138,868	$ 116,347
Less: accumulated depreciation and amortization	(55,339)	(47,210)
Property and equipment, net	83,529	69,137
Land
Property and equipment, net
Property and equipment, gross	5,382	5,382
Leasehold improvements
Property and equipment, net
Property and equipment, gross	2,300	2,300
Furniture and fixtures
Property and equipment, net
Property and equipment, gross	3,738	2,087
Office and computer equipment
Property and equipment, net
Property and equipment, gross	12,000	8,981
Computer software
Property and equipment, net
Property and equipment, gross	1,105	1,135
Equipment
Property and equipment, net
Property and equipment, gross	57,308	48,427
Buildings
Property and equipment, net
Property and equipment, gross	28,490	21,998
Vehicles
Property and equipment, net
Property and equipment, gross	$ 28,545	$ 26,037

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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