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SUMMARY OF SIGNIFICANT EVENTS AND ACCOUNTING POLICIES - Concentrations of Credit Risk (Details) - Revenue - Concentrations of Credit Risk - customer	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Concentrations of Credit Risk
Number of customers	3	2
Sunoco and Western Refining Inc.
Concentrations of Credit Risk
Percentage of concentration risk	73.00%	57.00%
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%	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.

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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

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