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OPERATING REVENUES - Revenue Recognition - Concentrations of Credit Risk (Details) - Revenue - Concentrations of Credit Risk - customer | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Concentrations of Credit Risk |  |
Number of customers | 2 | 2
Percentage of concentration risk | 81.00% | 58.00%
Sunoco |  |
Concentrations of Credit Risk |  |
Percentage of concentration risk | 10.00% |
Western refining |  |
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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