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INVESTMENTS (Narrative) (Details)	1 Months Ended			12 Months Ended
	Sep. 30, 2021 USD ($)	Dec. 31, 2019 USD ($)	Aug. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) shipping_contrainer	Nov. 30, 2021 USD ($)	Jul. 31, 2020 USD ($)	Dec. 31, 2017	Dec. 31, 2016 USD ($)	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Carrying value of investment				$ 146,515,000	$ 77,325,000
Total assets				3,387,977,000	4,863,854,000
Total liabilities				2,288,656,000	3,739,754,000
Total equity				1,076,658,000	1,124,292,000
Total liabilities and equity				3,387,977,000	4,863,854,000
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Property, plant, and equipment, net				612,234,000	764,607,000
Other assets				9,384,000	14,441,000
Total assets				752,016,000	926,675,000
Other liabilities				36,515,000	341,279,000
Total liabilities				507,421,000	961,661,000
Accumulated deficit				(6,808,000)	(33,951,000)
Total equity				244,595,000	(34,986,000)
Total liabilities and equity				752,016,000	$ 926,675,000
Clean Planet Energy USA LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage						50.00%
Falcon MSN 177 LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage						50.00%
Long Ridge Terminal LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage					50.00%
Ownership percentage sold		49.90%
Proceeds from sale of equity investment		$ 150,000,000
Gain related to Long Ridge transaction				116,700,000
Carrying value of investment				122,539,000	$ 0
Advanced Engine Repair JV
Schedule of Equity Method Investments [Line Items]
Ownership percentage			25.00%		25.00%				25.00%
Carrying value of investment				22,721,000	$ 21,317,000				$ 15,000,000
Equity method investment contribution amount			$ 13,500,000
JGP Energy Partners LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage								50.00%
Gain related to Long Ridge transaction		$ 4,600,000
Remaining ownership amount purchased		50.00%
Payments to acquire investment		$ 30,000,000
Additional goodwill recorded		$ 6,600,000
FYX Trust Holdco LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage					14.00%		14.00%
Carrying value of investment				1,255,000	$ 1,255,000		$ 1,300,000
Falcon MSN 177 LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage					50.00%
Carrying value of investment				0		$ 1,600,000
Clean Planet Energy USA LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage					50.00%
Carrying value of investment				$ 0	$ 858,000	$ 1,000,000
Shipping Containers Subject to Multiple Operating Leases | Containers | Intermodal Finance I, Ltd.
Schedule of Equity Method Investments [Line Items]
Shipping containers subject to multiple operating leases | shipping_contrainer					500
FIG | Intermodal Finance I, Ltd.
Schedule of Equity Method Investments [Line Items]
Ownership percentage										51.00%
Variable Interest Entity, Not Primary Beneficiary | Gladieux Metals Recycling
Schedule of Equity Method Investments [Line Items]
Ownership percentage	1.00%				1.00%
Variable Interest Entity, Not Primary Beneficiary | GM-FTAI Holdco LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage					50.00%
Payments to acquire investment	$ 52,500,000
Variable Interest Entity, Not Primary Beneficiary | GMR and Aleon
Schedule of Equity Method Investments [Line Items]
Ownership percentage	100.00%
Equity Investor | Intermodal Finance I, Ltd.
Schedule of Equity Method Investments [Line Items]
Ownership percentage										49.00%

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