INVESTMENTS - Share of Equity of Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule of Equity Method Investments [Line Items]
Income (loss)	$ (13,823)	$ (7,152)	$ (37,836)	$ (5,778)
Advanced Engine Repair JV
Schedule of Equity Method Investments [Line Items]
Income (loss)	(212)	(341)	(566)	(681)
Intermodal Finance I, Ltd.
Schedule of Equity Method Investments [Line Items]
Income (loss)	45	204	89	376
Long Ridge Terminal LLC
Schedule of Equity Method Investments [Line Items]
Income (loss)	(12,971)	(7,015)	(36,520)	(5,473)
Falcon MSN 177 LLC
Schedule of Equity Method Investments [Line Items]
Income (loss)	247	0	799	0
GM-FTAI Holdco LLC
Schedule of Equity Method Investments [Line Items]
Income (loss)	(688)	0	(1,121)	0
Clean Planet Energy USA LLC
Schedule of Equity Method Investments [Line Items]
Income (loss)	$ (244)	$ 0	$ (517)	$ 0