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- Definition

Equity Index

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- Definition

Equity Index Put Option Contract, Maximum Amount Payable

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Estimates the Probability of Equity Index Put Option Contract Strike Price on the Exercise Date.

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- Definition

Present Value of Theoretical Maximum Payouts.

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- Definition

Public equity portfolio fair value disclosure.

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- Definition

Settlement Amount If Contracts Had Expired

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- Definition

Theoretical Maximum Payout Discount Factor.

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- Definition

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

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- Definition

Nominal or face amount used to calculate payments on the derivative asset.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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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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- Definition

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)	12 Months Ended
Fair Value (Narrative) (Details)	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)	Dec. 31, 2018 GBP (£) security	Dec. 31, 2018 USD ($) security	Dec. 31, 2005 security	Dec. 31, 2001 security
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of public equity portfolio		$ 386,241,000		$ 124,228,000
Number of equity index put option contracts \| security					7	7
Derivatives, Number Of Indices \| item	2
Equity index put option liability		12,477,000		11,958,000
Other invested assets		382,283,000		358,042,000
Transfers between level 1 and 2				0
Transfers from level 3	$ 2,942,000	(788,000)
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity index put option liability		12,477,000		$ 11,958,000
Unavailability Of Prices [Member] \| Private Placement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities		165,173,000
Standard & Poor's 500 Index [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of equity index put option contracts \| security			5	5
Theoretical maximum payout occurs based on index value				$ 0
Estimates the probability of equity index put option contract will falling below the strike price on the exercise date	2.00%
Discount factor	3.00%
Present value of theoretical maximum payouts				412,550,000
Settlement amount if contracts had expired				0
Equity Index				$ 2,506.85
FTSE 100 Index [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of equity index put option contracts \| security			1	1
Theoretical maximum payout occurs based on index value				$ 0
Estimates the probability of equity index put option contract will falling below the strike price on the exercise date	24.00%
Discount factor	3.00%
Present value of theoretical maximum payouts				40,058,000
Settlement amount if contracts had expired				0
Equity Index \| £			£ 6,728.13
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of equity put options		12,477,000		11,958,000
Transfers from level 3
Fair Value [Member] \| Amortized Cost [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other invested assets		79,505,000		117,662,000
Par Value [Member] \| Private Placement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities		$ 51,965,000
Fixed Maturities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities				435,959,000
Fixed Maturities [Member] \| Investment Manager's Valuation Committee Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities				354,143,000
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] \| 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				$ 80,663,000