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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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