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OPERATING REVENUES - Revenue Recognition - Concentrations of Credit Risk (Details) - Revenue - Concentrations of Credit Risk - customer	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Concentrations of Credit Risk
Number of customers	2	2
Percentage of concentration risk	86.00%	58.00%
Sunoco
Concentrations of Credit Risk
Percentage of concentration risk	10.00%
Andeavor
Concentrations of Credit Risk
Percentage of concentration risk	10.00%
Crestwood
Concentrations of Credit Risk
Percentage of concentration risk		10.00%
Suncor
Concentrations of Credit Risk
Percentage of concentration risk		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.

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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
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-Name Accounting Standards Codification
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