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PROPERTY AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Property and equipment, net          
Property and equipment, gross $ 408,278   $ 408,278   $ 369,086
Less: accumulated depreciation and amortization (165,424)   (165,424)   (138,810)
Property and equipment, net 242,854   242,854   230,276
Total depreciation and amortization expense 11,300 $ 9,400 33,500 $ 26,200  
Land          
Property and equipment, net          
Property and equipment, gross 44,261   44,261   47,373
Leasehold improvements          
Property and equipment, net          
Property and equipment, gross 5,760   5,760   3,109
Furniture and fixtures          
Property and equipment, net          
Property and equipment, gross 6,925   6,925   6,461
Office and computer equipment          
Property and equipment, net          
Property and equipment, gross 18,384   18,384   14,506
Computer software          
Property and equipment, net          
Property and equipment, gross 3,103   3,103   3,650
Equipment          
Property and equipment, net          
Property and equipment, gross 176,732   176,732   148,434
Buildings          
Property and equipment, net          
Property and equipment, gross 113,625   113,625   107,374
Vehicles          
Property and equipment, net          
Property and equipment, gross $ 39,488   $ 39,488   $ 38,179