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Fair Value Measurements (Summarized Information About Level 3 Fair Value Measurements) (Details) - Level 3 - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Convertible Preferred Securities |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Assets, fair value measurement with unobservable input | $ 16,278 | $ 11,618 | $ 8,849
Recurring | Convertible Preferred Securities | Market approach |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Assets, fair value measurement with unobservable input | 16,278 | 11,618 |
Nonrecurring | Grain Assets | Third party appraisal |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Assets, fair value measurement with unobservable input | $ 9,000 |  |
Nonrecurring | Frac Sand Assets | Third party appraisal |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Assets, fair value measurement with unobservable input |  | 2,946 |
Nonrecurring | Real Property | Market approach |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Assets, fair value measurement with unobservable input |  | $ 700 |

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