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Fair Value Measurements (Quantitative Information Level 3 Measurements ) (Details) - Level 3 - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Convertible preferred securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Asset fair value | $ 15,625 | $ 15,625 | $ 15,410 | $ 16,278
Implied based on market prices | Convertible preferred securities | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Asset fair value | 15,625 | 15,625 | 15,410 |
Various | Ethanol Plant Assets | Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Asset fair value | $ 0 | $ 0 | $ 41,673 |

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