Public equity portfolio fair value disclosure.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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- Definition

Number of price risk derivative instruments held by the entity at the reporting date.

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Amount of assets classified as other.

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Fair Value (Narrative) (Details)	3 Months Ended
Fair Value (Narrative) (Details)	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