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PROPERTY AND EQUIPMENT, Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Property and equipment, net      
Property and equipment, gross $ 425,567   $ 417,092
Less: accumulated depreciation and amortization (184,335)   (174,041)
Property and equipment, net 241,232   243,051
Total depreciation and amortization expense 12,000 $ 10,900  
Land      
Property and equipment, net      
Property and equipment, gross 44,261   44,261
Leasehold improvements      
Property and equipment, net      
Property and equipment, gross 6,648   5,909
Furniture and fixtures      
Property and equipment, net      
Property and equipment, gross 7,314   6,932
Office and computer equipment      
Property and equipment, net      
Property and equipment, gross 19,568   18,717
Computer software      
Property and equipment, net      
Property and equipment, gross 3,171   3,278
Equipment      
Property and equipment, net      
Property and equipment, gross 188,426   183,727
Buildings      
Property and equipment, net      
Property and equipment, gross 116,496   115,242
Vehicles      
Property and equipment, net      
Property and equipment, gross $ 39,683   $ 39,026