INVESTMENTS - Ownership Carrying Values (Details) - USD ($)	Jun. 30, 2022	May 31, 2022	Dec. 31, 2021	Nov. 30, 2021	Jul. 31, 2020	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 99,543,000		$ 77,325,000
Advanced Engine Repair JV
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	25.00%					25.00%
Carrying Value	$ 20,752,000		21,317,000			$ 15,000,000
Falcon MSN 177 LLC
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	50.00%					50.00%
Carrying Value	$ 1,886,000		1,600,000			$ 1,600,000
Intermodal Finance I, Ltd.
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	51.00%
Carrying Value	$ 0		0
Long Ridge Terminal LLC
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	50.00%
Carrying Value	$ 0		0
Long Ridge Terminal LLC | Other Liabilities
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 188,000,000		$ 17,500,000
FYX Trust Holdco LLC
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	65.00%	51.00%	14.00%		14.00%
Carrying Value	$ 0		$ 1,255,000		$ 1,300,000
GM-FTAI Holdco LLC
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	27.00%
Carrying Value	$ 72,475,000		52,295,000
Clean Planet Energy USA LLC
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	50.00%			50.00%
Carrying Value	$ 4,430,000		$ 858,000