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INVESTMENTS - Ownership Carrying Values (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Nov. 17, 2023 | Nov. 30, 2021 | Dec. 31, 2012
--- | --- | --- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Carrying Value | $ 68,085 | $ 72,701 |  |  |
Intermodal Finance I, Ltd. |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Percentage | 51.00% |  |  |  | 51.00%
Carrying Value | $ 0 | 0 |  |  |
Long Ridge Energy & Power LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Percentage | 50.10% |  |  |  |
Carrying Value | $ 0 | 0 |  |  |
Long Ridge Energy & Power LLC | Other Liabilities |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Carrying Value | $ (54,800) | (29,300) |  |  |
GM-FTAI Holdco LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Percentage | 27.00% |  |  |  |
Carrying Value | $ 51,255 | 55,740 |  |  |
Clean Planet Energy USA LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Percentage | 50.00% |  |  | 50.00% |
Carrying Value | $ 10,117 | 10,136 |  |  |
Long Ridge West Virginia LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Percentage | 50.10% |  |  |  |
Carrying Value | $ 6,713 | $ 6,825 | $ 7,200 |  |

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