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Fair Value (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value of public equity portfolio | $ 154,693,000 |  | $ 154,693,000 |  | $ 124,228,000
Other invested assets | 508,835,000 |  | 508,835,000 |  | 358,042,000
Transfers between level 1 and 2 | 0 |  | 0 |  |
Accounting Standards Update 2015-07 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other invested assets | 160,264,000 |  | 160,264,000 |  | 117,662,000
Market Value [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Transfers from level 3 | 3,176,000 |  | 4,695,000 | $ 1,750,000 |
Fair Value [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Transfers from level 3 |  |  |  |  |
Fixed Maturities [Member] | Non-Binding Broker Quote [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Available-for-sale Securities |  |  |  |  | 1,153,000
Fixed Maturities [Member] | Market Value [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Available-for-sale Securities | 630,784,000 |  | 630,784,000 |  | 435,959,000
Transfers from level 3 | 3,176,000 |  | 4,695,000 |  |
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 | 480,181,000 |  | 480,181,000 |  | 354,143,000
Fixed Maturities [Member] | Fair Value [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Available-for-sale Securities |  |  |  |  | 2,337,000
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 |  |  |  |  | 2,337,000
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 | $ 150,603,000 |  | $ 150,603,000 |  | $ 80,663,000

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