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PROPERTY AND EQUIPMENT, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Property and equipment, net    
Property and equipment, gross $ 193,987 $ 189,874
Less: accumulated depreciation and amortization (94,730) (92,520)
Property and equipment, net 99,257 97,354
Land    
Property and equipment, net    
Property and equipment, gross 6,792 6,792
Leasehold improvements    
Property and equipment, net    
Property and equipment, gross 2,862 2,804
Furniture and fixtures    
Property and equipment, net    
Property and equipment, gross 3,599 3,551
Office and computer equipment    
Property and equipment, net    
Property and equipment, gross 10,639 11,080
Computer software    
Property and equipment, net    
Property and equipment, gross 2,672 2,530
Equipment    
Property and equipment, net    
Property and equipment, gross 97,124 93,465
Building    
Property and equipment, net    
Property and equipment, gross 40,043 39,848
Vehicles    
Property and equipment, net    
Property and equipment, gross $ 30,256 $ 29,804