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Fair Value (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value of public equity portfolio | $ 365,554,000 |  | $ 365,554,000 |  | $ 170,888,000
Other invested assets | 675,700,000 |  | 675,700,000 |  | 612,997,000
Transfers between level 1 and 2 | 0 |  | 0 |  |
Market Value [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Transfers from level 3 | (3,818,000) | $ 3,977,000 | (3,818,000) | $ 1,519,000 |
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 | 224,467,000 |  | 224,467,000 |  | 209,578,000
Fixed Maturities [Member] | Market Value [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Available-for-sale Securities | 1,023,838,000 |  | 1,023,838,000 |  | 772,979,000
Fixed Maturities [Member] | Market Value [Member] | Investment Manager's Valuation Committee Value [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Available-for-sale Securities | 782,259,000 |  | 782,259,000 |  | 610,873,000
Fixed Maturities [Member] | Fair Value [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Available-for-sale Securities | 4,431,000 |  | 4,431,000 |  | 5,826,000
Fixed Maturities [Member] | Fair Value [Member] | Investment Manager's Valuation Committee Value [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Available-for-sale Securities | 4,431,000 |  | 4,431,000 |  | 5,826,000
Fixed Maturities [Member] | Par Value [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Available-for-sale Securities | $ 241,580,000 |  | $ 241,580,000 |  | $ 162,106,000

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