SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounting for operations (Details) bbl in Millions	12 Months Ended
Dec. 31, 2019 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.

No definition available.

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration