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Fair Value Measurements (Quantitative Information Level 3 Measurements ) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
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Implied based on market prices | Level 3 | Convertible preferred securities | Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Asset fair value | $ 11,066 | $ 8,849 | $ 8,654

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