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Fair Value Measurements (Quantitative Information Level 3 Measurements ) (Details) - Level 3 - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Convertible preferred securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Asset fair value | $ 16,803 | $ 15,905 | $ 11,618 | $ 13,550 | $ 11,649 | $ 8,849
Third party appraisal | Frac sand assets | Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Asset fair value |  |  | 2,946 |  |  |
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 | 16,803 |  | 11,618 | $ 13,550 |  |
Implied based on market prices | Real property | Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Asset fair value |  |  | $ 700 |  |  |
Discounted cash flow analysis | Equity method investments | Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Asset fair value | $ 11,538 |  |  |  |  |

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