INVESTMENTS (Equity Method Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Equity Method Investments [Line Items]
Total expenses	$ (2,420)	$ 27,630	$ (8,624)	$ 26,452
Net loss	(19,478)	12,680	(23,967)	2,993
Long Ridge Terminal LLC
Schedule of Equity Method Investments [Line Items]
Total revenue	5,169		9,907
Total expenses	(8,483)		(14,858)
Other (loss) income	(1,840)		1,605
Net loss	(5,154)		(3,346)
Advanced Engine Repair JV
Schedule of Equity Method Investments [Line Items]
Total revenue	0	0	0	0
Total expenses	(2,374)	(1,047)	(4,738)	(1,851)
Net loss	$ (2,374)	$ (1,047)	$ (4,738)	$ (1,851)