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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment, Net, by Type [Abstract]          
Property and equipment, Gross $ 542,382   $ 542,382   $ 455,815
Accumulated depreciation (173,183)   (173,183)   (137,068)
Property and equipment, Net 369,199   369,199   318,747
Depreciation 18,040 $ 15,504 49,109 $ 45,973  
Revenue equipment          
Property, Plant and Equipment, Net, by Type [Abstract]          
Property and equipment, Gross 474,544   474,544   398,394
Buildings and improvements          
Property, Plant and Equipment, Net, by Type [Abstract]          
Property and equipment, Gross 50,546   50,546   43,000
Furniture and fixtures, office and computer equipment and vehicles          
Property, Plant and Equipment, Net, by Type [Abstract]          
Property and equipment, Gross $ 17,292   $ 17,292   $ 14,421