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Fair Value (Narrative) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2005 Item
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of public equity portfolio | $ 784,746,000 | $ 170,888,000 |
Number of equity index put option contracts | Item |  |  | 7
Derivatives, number of indices | Item |  |  | 2
Other invested assets | 742,369,000 | 612,997,000 |
Transfers between level 1 and 2 | 0 |  |
Market Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Transfers from level 3 | (924,000) | 4,695,000 |
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 | 224,698,000 | 209,578,000 |
Fixed Maturities [Member] | Market Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Available-for-sale Securities | 1,330,224,000 | 772,979,000 |
Fixed Maturities [Member] | Market Value [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Transfers from level 3 | (924,000) | 4,695,000 |
Fixed Maturities [Member] | Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Available-for-sale Securities |  | $ 5,826,000 |
Equity Securities [Member] | Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Transfers from level 3 | $ (9,877,000) |  |

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