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Fair Value (Narrative) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of public equity portfolio | $ 1,116,408 | $ 784,746
Other invested assets | 868,477 | 742,369
Fair Value [Member] | Investments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other invested assets | 289,278 | 224,698
Fixed Maturities [Member] | Market Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available-for-sale Securities | $ 1,525,734 | $ 1,330,224

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