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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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