The number of refined terminals held by the entity.

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The percentage of administrative fee reimbursed during the period.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of transactions with related party during the financial reporting period.

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Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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TRANSACTIONS WITH AFFILIATES - Agreements (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) item bbl	Jun. 30, 2019 USD ($)
June 2020 terminaling services agreement-Brownsville LLC \| Frontera \| Brownsville terminals
Transactions with affiliates
Number of Terminaling Services Agreements \| item			2
Storage capacity agreed to be provided (in barrels) \| bbl			301,000
Throughput revenue	$ 0.6	$ 0.7	$ 1.3	$ 1.4
June 2020 terminaling services agreement-Brownsville LLC \| Frontera \| Brownsville terminals \| Minimum
Transactions with affiliates
Notice period for termination of service agreement			90 days
June 2020 terminaling services agreement-Brownsville LLC \| Frontera \| Brownsville terminals \| Maximum
Transactions with affiliates
Notice period for termination of service agreement			180 days
Operations and reimbursement agreement-Frontera \| Frontera
Transactions with affiliates
Ownership interest in joint venture (as a percent)	50.00%		50.00%
Revenue recognized	$ 1.3	1.4	$ 2.8	3.0
Terminaling services agreement- Gulf Coast Terminals \| Associated Asphalt Marketing, LLC \| Gulf Coast Terminals
Transactions with affiliates
Automatic renewal period of service agreement			2 years
Notice period for termination of service agreement			180 days
Storage capacity agreed to be provided (in barrels) \| bbl			750,000
Throughput revenue	$ 2.1	2.2	$ 4.2	4.5
Operating and administrative agreement SeaPort Midstream Partners, LLC \| TMS \| Central Services
Transactions with affiliates
Number of refined terminals operated \| item			2
Operating and administrative agreement SeaPort Midstream Partners, LLC \| SeaPort Midstream Partners, LLC \| SeaPort Midstream Holdings, LLC \| Central Services
Transactions with affiliates
Ownership interest in joint venture (as a percent)	51.00%		51.00%
Operating and administrative agreement SeaPort Midstream Partners, LLC \| SeaPort Midstream Partners, LLC \| Central Services
Transactions with affiliates
Revenue recognized	$ 0.8	0.8	$ 1.6	1.7
Automatic renewal period of service agreement			2 years
Notice period for termination of service agreement			12 months
Reimbursement agreement \| ArcLight \| Central Services
Transactions with affiliates
Revenue recognized	0.4	0.4	$ 0.6	0.8
Services Agreement \| SeaPort Sound Terminal, LLC \| Central Services
Transactions with affiliates
Revenue recognized	1.9	1.6	$ 3.8	3.2
Services Agreement \| TransMontaigne Management Company, LLC
Transactions with affiliates
Administration fee (in Percentage)			1.00%
Aggregate fees paid	$ 0.5	$ 0.0	$ 1.7	$ 0.0