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CONCENTRATION OF CREDIT RISK AND TRADE ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Concentration of credit risk and trade accounts receivable      
Trade accounts receivable $ 9,114   $ 6,448
Less allowance for doubtful accounts (119)   (475)
Trade accounts receivable, net $ 8,995   $ 5,973
NGL Energy Partners LP      
Concentration of credit risk and trade accounts receivable      
Percentage of total revenue generated by major customer 22.00% 24.00%  
Castleton Commodities International LLC      
Concentration of credit risk and trade accounts receivable      
Percentage of total revenue generated by major customer 15.00%    
RaceTrac Petroleum Inc      
Concentration of credit risk and trade accounts receivable      
Percentage of total revenue generated by major customer 13.00% 13.00%  
Morgan Stanley Capital Group      
Concentration of credit risk and trade accounts receivable      
Percentage of total revenue generated by major customer   13.00%