PROPERTY AND EQUIPMENT, Net (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Property and equipment, net
Property and equipment, gross	$ 77,226	$ 56,848
Less: accumulated depreciation and amortization	(33,156)	(22,297)
Property and equipment, net	44,070	34,551
Land
Property and equipment, net
Property and equipment, gross	3,626	3,076
Leasehold improvements
Property and equipment, net
Property and equipment, gross	2,100	1,998
Furniture and fixtures
Property and equipment, net
Property and equipment, gross	2,046	1,959
Office and computer equipment
Property and equipment, net
Property and equipment, gross	6,426	5,541
Computer software
Property and equipment, net
Property and equipment, gross	9,198	8,428
Equipment
Property and equipment, net
Property and equipment, gross	30,472	20,150
Building
Property and equipment, net
Property and equipment, gross	3,132
Vehicles
Property and equipment, net
Property and equipment, gross	$ 20,226	$ 15,696