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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items]    
Purchase obligation $ 147,500  
Chassis converter pool agreements 22,273 $ 18,326
Arizona Department Of Environmental Quality    
Loss Contingencies [Line Items]    
Loss contingency, estimate of possible loss 100  
Standby Letters Of Credit    
Loss Contingencies [Line Items]    
Letters of credit outstanding, amount 8,200  
Chassis Converter Pool Agreements    
Loss Contingencies [Line Items]    
Other inventory, gross $ 5,500