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v3.19.1

Fair Value (Narrative) (Details) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2005 security | Dec. 31, 2001 security
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value of public equity portfolio | $ 151,699,000 |  | $ 124,228,000 |  |
Number of equity index put option contracts | security |  |  |  | 7 | 7
Equity index put option liability | 8,727,000 |  | 11,958,000 |  |
Other invested assets | 326,344,000 |  | 358,042,000 |  |
Transfers between level 1 and 2 | 0 |  |  |  |
Transfers from level 3 | (2,458,000) |  |  |  |
Accounting Standards Update 2015-07 [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other invested assets | 146,522,000 |  | 117,662,000 |  |
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Equity index put option liability | 8,727,000 |  | 11,958,000 |  |
Market Value [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Transfers from level 3 | (2,458,000) |  |  |  |
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 | 445,124,000 |  | 435,959,000 |  |
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 | 360,518,000 |  | 354,143,000 |  |
Fixed Maturities [Member] | Fair Value [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Available-for-sale Securities | 2,350,000 |  | 2,337,000 |  |
Fixed Maturities [Member] | Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member] | Amortized Cost [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Available-for-sale Securities | 84,606,000 |  |  |  |
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 | $ 2,350,000 |  | 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 |  |  | $ 80,663,000 |  |

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