PROPERTY AND EQUIPMENT, Net (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Property and equipment, net
Property and equipment, gross	$ 176,745	$ 173,735
Less: accumulated depreciation and amortization	(88,449)	(83,579)
Property and equipment, net	88,296	90,156
Land
Property and equipment, net
Property and equipment, gross	6,792	6,792
Leasehold improvements
Property and equipment, net
Property and equipment, gross	2,723	2,796
Furniture and fixtures
Property and equipment, net
Property and equipment, gross	3,359	3,371
Office and computer equipment
Property and equipment, net
Property and equipment, gross	10,229	10,072
Computer software
Property and equipment, net
Property and equipment, gross	1,774	1,317
Equipment
Property and equipment, net
Property and equipment, gross	86,887	84,263
Building
Property and equipment, net
Property and equipment, gross	37,746	37,311
Vehicles
Property and equipment, net
Property and equipment, gross	$ 27,235	$ 27,813