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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
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Concentrations of Credit Risk |  |  |
Number of customers | 2 | 2 | 2
Sunoco and Western Refining Inc. |  |  |
Concentrations of Credit Risk |  |  |
Percentage of concentration risk | 80.00% | 77.00% |
Sunoco | Minimum |  |  |
Concentrations of Credit Risk |  |  |
Percentage of concentration risk | 10.00% | 10.00% |
Western Refining | Minimum |  |  |
Concentrations of Credit Risk |  |  |
Percentage of concentration risk | 10.00% | 10.00% |
Crestwood and Suncor |  |  |
Concentrations of Credit Risk |  |  |
Percentage of concentration risk |  |  | 58.00%
Crestwood | Minimum |  |  |
Concentrations of Credit Risk |  |  |
Percentage of concentration risk |  |  | 10.00%
Suncor | Minimum |  |  |
Concentrations of Credit Risk |  |  |
Percentage of concentration risk |  |  | 10.00%

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