EQUITY INVESTMENTS - Equity Investments (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2019	Jan. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Equity investments
Total earnings (loss) from equity investments			$ 4,711	$ (292,387)	$ 10,927	$ (276,633)
VTTI B.V.
Equity investments
Total earnings (loss) from equity investments			0	(295,905)	0	(286,633)
Non-cash loss on write-down of investment in VTTI B.V.	$ (300,300)			(300,300)
Global Marine Terminals | VTTI B.V.
Equity investments
Total earnings (loss) from equity investments			0	4,375	0	13,647
Non-cash loss on write-down of investment in VTTI B.V.			0	(300,280)	0	(300,280)
Global Marine Terminals | South Texas Gateway Terminal LLC
Equity investments
Total earnings (loss) from equity investments			(281)	(251)	(864)	(427)
Domestic Pipelines & Terminals | West Shore Pipe Line Company
Equity investments
Total earnings (loss) from equity investments			3,457	2,750	8,542	7,542
Domestic Pipelines & Terminals | Muskegon Pipeline LLC
Equity investments
Total earnings (loss) from equity investments			766	353	1,227	1,109
Domestic Pipelines & Terminals | Transport4, LLC
Equity investments
Total earnings (loss) from equity investments			315	164	804	614
Domestic Pipelines & Terminals | South Portland Terminal LLC
Equity investments
Total earnings (loss) from equity investments			$ 454	$ 502	$ 1,218	$ 1,162
Disposed of by sale | VTTI B.V.
Equity investments
Percentage of ownership sold		50.00%