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CONCENTRATION OF CREDIT RISK AND TRADE ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Concentration of credit risk and trade accounts receivable
Revenue in accordance with ASC 606	$ 3,000		$ 3,000
Trade accounts receivable	11,415		11,415		$ 16,627
Less allowance for doubtful accounts					(127)
Trade accounts receivable, net	$ 11,415		$ 11,415		$ 16,500
Pilot Flying J
Concentration of credit risk and trade accounts receivable
Percentage of total revenue generated by major customer	14.00%		14.00%
Freepoint Commodities LLC
Concentration of credit risk and trade accounts receivable
Percentage of total revenue generated by major customer	10.00%		11.00%
RaceTrac Petroleum Inc
Concentration of credit risk and trade accounts receivable
Percentage of total revenue generated by major customer	9.00%	9.00%	9.00%	10.00%
NGL Energy Partners LP
Concentration of credit risk and trade accounts receivable
Percentage of total revenue generated by major customer		19.00%	2.00%	20.00%