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Fair Values of Financial Instruments (Narrative) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) limitedPartnershipFund entity | Dec. 31, 2022 USD ($) limitedPartnershipFund
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Coinsurance deposits | $ 14,582,728 | $ 13,254,956 | [1]
Fixed Index Annuities - Embedded Derivatives |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Coinsurance deposits | $ 1,182,600 | $ 1,173,400 |
Limited partnership funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Limited partnerships and limited liability companies, number of consolidated limited partnership funds measured using NAV as practical expedient | limitedPartnershipFund | 1 | 2 |
Limited partnerships and limited liability companies, number of consolidated limited partnership funds that terminated and liquidated during the period | limitedPartnershipFund | 1 |  |
Unfunded commitments | $ 180,900 | $ 926,300 |
Significant Unobservable Inputs (Level 3) | Real estate investments | Fair Value, Measurements, Recurring | Discounted cash flow |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash flow modeling period | 10 years |  |
Significant Unobservable Inputs (Level 3) | Limited partnerships and limited liability companies | Fair Value, Measurements, Recurring | Discounted cash flow |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Variable interest entities, number of consolidated variable interest entities | entity | 2 |  |
Discount Rate | Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value, sensitivity, discount rate adjustment (basis points) | 0.0100 |  |
Fixed index annuities embedded derivative, adjustment due to change in discount rate | $ (364,700) |  |
Discount Rate | Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value, sensitivity, discount rate adjustment (basis points) | 0.0100 |  |
Fixed index annuities embedded derivative, adjustment due to change in discount rate | $ 419,700 |  |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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