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Fair Values of Financial Instruments (Assets and Liabilities Measured on a Recurring Basis by Fair Value Hierarchy) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Assets |  |  |
Derivative instruments | $ 1,207,288 | $ 431,727 | [1]
Market risk benefits | 479,694 | 229,871 | [1]
Liabilities |  |  |
Market risk benefits | 3,146,554 | 2,455,492 | [1]
Fair Value, Measurements, Recurring |  |  |
Assets |  |  |
Real estate investments | 1,217,271 | 940,559 |
Limited partnerships and limited liability companies | 506,685 | 684,835 |
Derivative instruments | 1,207,288 | 431,727 |
Cash and cash equivalents | 9,772,586 | 1,919,669 |
Market risk benefits | 479,694 | 229,871 |
Assets | 49,759,517 | 45,024,575 |
Liabilities |  |  |
Market risk benefits | 3,146,554 | 2,455,492 |
Liabilities | 8,071,672 | 6,834,473 |
Fair Value, Measurements, Recurring | Funds Withheld Liability - Embedded Derivative |  |  |
Liabilities |  |  |
Derivative liabilities | (256,776) | (441,864) |
Fair Value, Measurements, Recurring | Fixed Index Annuities - Embedded Derivatives |  |  |
Liabilities |  |  |
Derivative liabilities | 5,181,894 | 4,820,845 |
Fair Value, Measurements, Recurring | U.S. Government and agencies |  |  |
Assets |  |  |
Investments | 171,141 | 169,071 |
Fair Value, Measurements, Recurring | States, municipalities and territories |  |  |
Assets |  |  |
Investments | 3,098,940 | 3,822,982 |
Fair Value, Measurements, Recurring | Foreign corporate securities and foreign governments |  |  |
Assets |  |  |
Investments | 493,739 | 676,852 |
Fair Value, Measurements, Recurring | Corporate securities |  |  |
Assets |  |  |
Investments | 20,603,416 | 24,161,921 |
Fair Value, Measurements, Recurring | Residential mortgage backed securities |  |  |
Assets |  |  |
Investments | 1,402,501 | 1,377,611 |
Fair Value, Measurements, Recurring | Commercial mortgage backed securities |  |  |
Assets |  |  |
Investments | 2,952,547 | 3,687,478 |
Fair Value, Measurements, Recurring | Other asset backed securities |  |  |
Assets |  |  |
Investments | 6,058,198 | 5,908,702 |
Fair Value, Measurements, Recurring | Other investments |  |  |
Assets |  |  |
Investments | 1,795,511 | 1,013,297 |
Fair Value, Measurements, Recurring | NAV |  |  |
Assets |  |  |
Real estate investments | 0 | 0 |
Limited partnerships and limited liability companies | 353,554 | 620,626 |
Derivative instruments | 0 | 0 |
Cash and cash equivalents | 0 | 0 |
Market risk benefits | 0 | 0 |
Assets | 353,554 | 620,626 |
Liabilities |  |  |
Market risk benefits | 0 | 0 |
Liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | NAV | Funds Withheld Liability - Embedded Derivative |  |  |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | NAV | Fixed Index Annuities - Embedded Derivatives |  |  |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | NAV | U.S. Government and agencies |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | NAV | States, municipalities and territories |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | NAV | Foreign corporate securities and foreign governments |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | NAV | Corporate securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | NAV | Residential mortgage backed securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | NAV | Commercial mortgage backed securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | NAV | Other asset backed securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | NAV | Other investments |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) |  |  |
Assets |  |  |
Real estate investments | 0 | 0 |
Limited partnerships and limited liability companies | 0 | 0 |
Derivative instruments | 0 | 0 |
Cash and cash equivalents | 9,772,586 | 1,919,669 |
Market risk benefits | 0 | 0 |
Assets | 10,675,775 | 2,344,133 |
Liabilities |  |  |
Market risk benefits | 0 | 0 |
Liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Funds Withheld Liability - Embedded Derivative |  |  |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Fixed Index Annuities - Embedded Derivatives |  |  |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | U.S. Government and agencies |  |  |
Assets |  |  |
Investments | 27,593 | 26,184 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | States, municipalities and territories |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Foreign corporate securities and foreign governments |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Corporate securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Residential mortgage backed securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Commercial mortgage backed securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Other asset backed securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Other investments |  |  |
Assets |  |  |
Investments | 875,596 | 398,280 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |
Assets |  |  |
Real estate investments | 0 | 0 |
Limited partnerships and limited liability companies | 0 | 0 |
Derivative instruments | 1,207,288 | 431,727 |
Cash and cash equivalents | 0 | 0 |
Market risk benefits | 0 | 0 |
Assets | 34,811,464 | 39,979,911 |
Liabilities |  |  |
Market risk benefits | 0 | 0 |
Liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Funds Withheld Liability - Embedded Derivative |  |  |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Fixed Index Annuities - Embedded Derivatives |  |  |
Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government and agencies |  |  |
Assets |  |  |
Investments | 143,548 | 142,887 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | States, municipalities and territories |  |  |
Assets |  |  |
Investments | 2,876,723 | 3,822,982 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign corporate securities and foreign governments |  |  |
Assets |  |  |
Investments | 493,739 | 676,852 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate securities |  |  |
Assets |  |  |
Investments | 20,347,979 | 23,759,573 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential mortgage backed securities |  |  |
Assets |  |  |
Investments | 1,402,501 | 1,377,611 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial mortgage backed securities |  |  |
Assets |  |  |
Investments | 2,952,547 | 3,687,478 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other asset backed securities |  |  |
Assets |  |  |
Investments | 4,467,224 | 5,465,784 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other investments |  |  |
Assets |  |  |
Investments | 919,915 | 615,017 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |  |
Assets |  |  |
Real estate investments | 1,217,271 | 940,559 |
Limited partnerships and limited liability companies | 153,131 | 64,209 |
Derivative instruments | 0 | 0 |
Cash and cash equivalents | 0 | 0 |
Market risk benefits | 479,694 | 229,871 |
Assets | 3,918,724 | 2,079,905 |
Liabilities |  |  |
Market risk benefits | 3,146,554 | 2,455,492 |
Liabilities | 8,071,672 | 6,834,473 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Funds Withheld Liability - Embedded Derivative |  |  |
Liabilities |  |  |
Derivative liabilities | (256,776) | (441,864) |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Fixed Index Annuities - Embedded Derivatives |  |  |
Liabilities |  |  |
Derivative liabilities | 5,181,894 | 4,820,845 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. Government and agencies |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | States, municipalities and territories |  |  |
Assets |  |  |
Investments | 222,217 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign corporate securities and foreign governments |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate securities |  |  |
Assets |  |  |
Investments | 255,437 | 402,348 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Residential mortgage backed securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commercial mortgage backed securities |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other asset backed securities |  |  |
Assets |  |  |
Investments | 1,590,974 | 442,918 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other investments |  |  |
Assets |  |  |
Investments | $ 0 | $ 0 |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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