PROPERTY AND EQUIPMENT (Details) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Total property and equipment		$ 186,071,000	$ 165,939,000
Accumulated depreciation		(38,919,000)	(29,479,000)
Construction in progress		585,000	8,848,000
Property and equipment, net		147,737,000	145,308,000
Capitalized interest		558,000	0	$ 0
Contract with customer, liability, noncurrent			0
Depreciation and amortization		8,100,000	8,500,000	9,500,000
ARO liability		$ 200,000			$ 1,000,000
Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)		3 years
Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)		30 years
Land
Property, Plant and Equipment [Line Items]
Total property and equipment		$ 10,224,000	10,004,000
Trackage and facilities
Property, Plant and Equipment [Line Items]
Total property and equipment		$ 126,008,000	123,080,000
Trackage and facilities | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)		10 years
Trackage and facilities | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)		30 years
Pipeline
Property, Plant and Equipment [Line Items]
Total property and equipment		$ 32,916,000	16,336,000
Pipeline | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)		20 years
Pipeline | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)		30 years
Equipment
Property, Plant and Equipment [Line Items]
Total property and equipment		$ 16,857,000	16,455,000
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)		3 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)		20 years
Furniture
Property, Plant and Equipment [Line Items]
Total property and equipment		$ 66,000	64,000
Furniture | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)		5 years
Furniture | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life (in years)		10 years
Terminalling services
Property, Plant and Equipment [Line Items]
Asset impairment charges	$ 1,700,000				3,500,000
Fair Value property, plant, and equipment					$ 200,000
San Antonio Terminal | Terminalling services
Property, Plant and Equipment [Line Items]
ARO liability		$ 200,000	800,000
Third-Party Customer
Property, Plant and Equipment [Line Items]
Contract with customer, liability, noncurrent	$ 0		$ 0	$ 0