Assets Deposited With Governmental Authorities.

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Commercial mortgage loans, Percentage

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Financial Instruments Owned and Pledged as Collateral

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Write-down on accrued investment income receivable

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount at par value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), purchased with credit deterioration.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Fair value of collateral permitted, by contact or custom, to be sold or re-pledged.

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Amount at par value of financing receivable purchased with credit deterioration.

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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

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The cash outflow for the purchase of loan receivable arising from the financing of goods and services.

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The cash inflow associated with the sale of loans receivables arising from the financing of goods and services.

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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, before effects of master netting arrangements, of financial assets loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and financial assets transferred other than securities that qualify as secured borrowings.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value of liabilities arising from or related to a financial instrument held by the entity for its own account (proprietary securities) which has been pledged to counterparties.

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Amount of unrealized gain (loss) on investment.

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Investments (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Investments (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Equity Method Investments	$ 0	$ 0
Fair value of collateral	$ 150,000	$ 302,000
Commercial mortgage loans, Percentage	100.00%	100.00%
Commercial mortgage and others loans, Acquired	$ 0	$ 0
Commercial mortgage and other loans, Sold	0	206,000
Repurchase Agreements	0	0
Securities Lending	0	0
Fixed maturities, available-for-sale	18,584,685	13,202,365
Loans on non-accrual status with a related allowance for credit losses	0
Loans on non-accrual status with a related allowance for credit losses which recognized interest income	200
Fixed Maturity Purchased with Credit Deterioration	0
Commercial mortgage and other loans purchased with credit deterioration	0
Write-down on accrued investment income receivable	0
Total securities pledged	0	0
Total liabilities supported by pledged collateral	0	0
Carrying value of non-income producing assets
Schedule of Investments [Line Items]
Fixed maturities, available-for-sale	$ 4,100
California
Schedule of Investments [Line Items]
Commercial mortgage loans, Percentage	24.00%
Texas
Schedule of Investments [Line Items]
Commercial mortgage loans, Percentage	12.00%
New York
Schedule of Investments [Line Items]
Commercial mortgage loans, Percentage	10.00%
Europe
Schedule of Investments [Line Items]
Commercial mortgage loans, Percentage	15.00%
Australia
Schedule of Investments [Line Items]
Commercial mortgage loans, Percentage	3.00%
Fixed maturities
Schedule of Investments [Line Items]
Gross Unrealized Gains	$ 2,431,362	792,306
Gross Unrealized losses	23,882	55,687
Gross unrealized losses of twelve months or more	6,072	10,071
Fixed maturities, available-for-sale	18,584,685	13,202,365
Assets Deposited With Governmental Authorities	10,000	10,700
NAIC high or highest quality rating \| Fixed maturities
Schedule of Investments [Line Items]
Gross Unrealized losses	17,400	52,500
NAIC other than high or highest quality rating \| Fixed maturities
Schedule of Investments [Line Items]
Gross Unrealized losses	6,500	3,200
Other Income (Loss) \| Equity securities
Schedule of Investments [Line Items]
Unrealized Gain (Loss) on Investments	5,100	2,000	$ (1,900)
Fixed maturities
Schedule of Investments [Line Items]
Gross unrealized losses of twelve months or more	$ 6,100	$ 10,100