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PROPERTY AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Property and equipment, net          
Property and equipment, gross       $ 306,061 $ 283,252
Less: accumulated depreciation and amortization       (116,430) (109,909)
Property and equipment, net $ 189,631   $ 173,343 189,631 173,343
Total depreciation and amortization expense $ 8,200 $ 7,200      
Land          
Property and equipment, net          
Property and equipment, gross       47,373 46,596
Leasehold improvements          
Property and equipment, net          
Property and equipment, gross       3,115 2,687
Furniture and fixtures          
Property and equipment, net          
Property and equipment, gross       3,710 3,635
Office and computer equipment          
Property and equipment, net          
Property and equipment, gross       11,917 11,701
Computer software          
Property and equipment, net          
Property and equipment, gross       2,917 3,274
Equipment          
Property and equipment, net          
Property and equipment, gross       120,459 114,230
Buildings          
Property and equipment, net          
Property and equipment, gross       81,837 69,547
Vehicles          
Property and equipment, net          
Property and equipment, gross       $ 34,733 $ 31,582