MAJOR CUSTOMERS AND CONCENTRATION OF CREDIT RISK (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Concentration Risk [Line Items]
Operating revenue	$ 28,554	$ 28,343	$ 27,871	$ 26,357	$ 26,063	$ 21,797	$ 20,395	$ 13,508	$ 111,125	$ 81,763	$ 36,098
Customer Concentration Risk | Customer Revenues | Customer A
Concentration Risk [Line Items]
Operating revenue									$ 11,140	$ 12,207
Concentration risk (as a percentage)									10.00%	14.90%
Customer Concentration Risk | Customer Revenues | Customer B
Concentration Risk [Line Items]
Operating revenue									$ 15,827	$ 11,428
Concentration risk (as a percentage)									14.20%	14.00%
Customer Concentration Risk | Customer Revenues | Customer C
Concentration Risk [Line Items]
Operating revenue									$ 11,436	$ 9,890
Concentration risk (as a percentage)									10.30%	12.10%
Customer Concentration Risk | Customer Revenues | Customer D
Concentration Risk [Line Items]
Operating revenue									$ 11,611	$ 10,402
Concentration risk (as a percentage)									10.40%	12.70%
Customer Concentration Risk | Customer Revenues | Customer E
Concentration Risk [Line Items]
Operating revenue									$ 10,158	$ 8,763
Concentration risk (as a percentage)									9.10%	10.70%
Customer Concentration Risk | Customer Revenues | Customer F
Concentration Risk [Line Items]
Operating revenue									$ 4,334	$ 8,859
Concentration risk (as a percentage)									3.90%	10.80%
Customer Concentration Risk | Customer Revenues | Customer G
Concentration Risk [Line Items]
Operating revenue									$ 15,249	$ 1,846
Concentration risk (as a percentage)									13.70%	2.30%
Terminalling services | Customer Concentration Risk | Customer Revenues | Customer A
Concentration Risk [Line Items]
Concentration risk (as a percentage)									96.00%	98.00%
Terminalling services | Customer Concentration Risk | Customer Revenues | Customer B
Concentration Risk [Line Items]
Concentration risk (as a percentage)									100.00%	100.00%
Terminalling services | Customer Concentration Risk | Customer Revenues | Customer C
Concentration Risk [Line Items]
Concentration risk (as a percentage)									100.00%	90.00%
Terminalling services | Customer Concentration Risk | Customer Revenues | Customer D
Concentration Risk [Line Items]
Concentration risk (as a percentage)									60.00%	50.00%
Terminalling services | Customer Concentration Risk | Customer Revenues | Customer E
Concentration Risk [Line Items]
Concentration risk (as a percentage)									100.00%	100.00%
Terminalling services | Customer Concentration Risk | Customer Revenues | Customer F
Concentration Risk [Line Items]
Concentration risk (as a percentage)									0.00%	0.00%
Terminalling services | Customer Concentration Risk | Customer Revenues | Customer G
Concentration Risk [Line Items]
Concentration risk (as a percentage)									100.00%	100.00%
Fleet services | Customer Concentration Risk | Customer Revenues | Customer A
Concentration Risk [Line Items]
Concentration risk (as a percentage)									4.00%	2.00%
Fleet services | Customer Concentration Risk | Customer Revenues | Customer B
Concentration Risk [Line Items]
Concentration risk (as a percentage)									0.00%	0.00%
Fleet services | Customer Concentration Risk | Customer Revenues | Customer C
Concentration Risk [Line Items]
Concentration risk (as a percentage)									0.00%	10.00%
Fleet services | Customer Concentration Risk | Customer Revenues | Customer D
Concentration Risk [Line Items]
Concentration risk (as a percentage)									40.00%	50.00%
Fleet services | Customer Concentration Risk | Customer Revenues | Customer E
Concentration Risk [Line Items]
Concentration risk (as a percentage)									0.00%	0.00%
Fleet services | Customer Concentration Risk | Customer Revenues | Customer F
Concentration Risk [Line Items]
Concentration risk (as a percentage)									100.00%	100.00%
Fleet services | Customer Concentration Risk | Customer Revenues | Customer G
Concentration Risk [Line Items]
Concentration risk (as a percentage)									0.00%	0.00%