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PROPERTY AND EQUIPMENT, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property and equipment, net      
Property and equipment, gross $ 417,092 $ 369,086  
Less: accumulated depreciation and amortization (174,041) (138,810)  
Property and equipment, net 243,051 230,276  
Total depreciation and amortization expense 45,000 37,000 $ 30,200
Land      
Property and equipment, net      
Property and equipment, gross 44,261 47,373  
Leasehold improvements      
Property and equipment, net      
Property and equipment, gross 5,909 3,109  
Furniture and fixtures      
Property and equipment, net      
Property and equipment, gross 6,932 6,461  
Office and computer equipment      
Property and equipment, net      
Property and equipment, gross 18,717 14,506  
Computer software      
Property and equipment, net      
Property and equipment, gross 3,278 3,650  
Equipment      
Property and equipment, net      
Property and equipment, gross 183,727 148,434  
Buildings      
Property and equipment, net      
Property and equipment, gross 115,242 107,374  
Vehicles      
Property and equipment, net      
Property and equipment, gross $ 39,026 $ 38,179