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Fair Value Measurements (Summarized Information About Level 3 Fair Value Measurements) (Details) - Level 3 - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Convertible Preferred Securities |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Assets, fair value measurement with unobservable input | $ 15,625 | $ 16,278 | $ 11,618
Recurring | Convertible Preferred Securities | Implied based on market prices |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Assets, fair value measurement with unobservable input | $ 15,625 | 16,278 |
Nonrecurring | Frac Sand Assets | Third party appraisal |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Assets, fair value measurement with unobservable input |  | $ 9,000 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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