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Fair Value (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of public equity portfolio | $ 912,126 |  | $ 784,746
Other invested assets | 801,424 |  | 742,369
Market Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Transfers from level 3 |  |  |
Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Transfers from level 3 |  |  |
Fair Value [Member] | Investments [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other invested assets | 240,892 |  | 224,698
Fixed Maturities [Member] | Market Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Available-for-sale Securities | $ 1,495,500 |  | $ 1,330,224

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