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PROPERTY AND EQUIPMENT, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Property and equipment, net    
Property and equipment, gross $ 193,867 $ 173,735
Less: accumulated depreciation and amortization (99,140) (83,579)
Property and equipment, net 94,727 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 2,745 2,796
Furniture and fixtures    
Property and equipment, net    
Property and equipment, gross 3,497 3,371
Office and computer equipment    
Property and equipment, net    
Property and equipment, gross 10,864 10,072
Computer software    
Property and equipment, net    
Property and equipment, gross 2,283 1,317
Equipment    
Property and equipment, net    
Property and equipment, gross 99,874 84,263
Building    
Property and equipment, net    
Property and equipment, gross 39,421 37,311
Vehicles    
Property and equipment, net    
Property and equipment, gross $ 28,391 $ 27,813