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SUMMARY OF SIGNIFICANT EVENTS AND ACCOUNTING POLICIES (Details) - Concentrations of Credit Risk (Details) - Revenue - Concentrations of Credit Risk - customer	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Concentrations of Credit Risk
Number of customers	2	2	2
Sunoco and Western Refining Inc.
Concentrations of Credit Risk
Percentage of concentration risk	77.00%
Sunoco | Minimum
Concentrations of Credit Risk
Percentage of concentration risk	10.00%
Western Refining | Minimum
Concentrations of Credit Risk
Percentage of concentration risk	10.00%
Crestwood and Suncor
Concentrations of Credit Risk
Percentage of concentration risk		58.00%	58.00%
Crestwood | Minimum
Concentrations of Credit Risk
Percentage of concentration risk		10.00%	10.00%
Suncor | Minimum
Concentrations of Credit Risk
Percentage of concentration risk		10.00%	10.00%

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- Definition

Represents the number of customers who typically generate revenue in excess of a specified percentage of total revenues for the entity.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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