SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounting for operations (Details) bbl in Millions	6 Months Ended
Jun. 30, 2020 bbl
Lucknow-Highspire Terminals, LLC
Related Party Transaction [Line Items]
Terminal storage capacity (in barrels)	9.9

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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