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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, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Derivative instruments | $ 431,727 | $ 1,277,480
Market risk benefits | 229,871 | 526,373
Liabilities |  |
Market risk benefits | 2,455,492 | 3,162,162
Fair Value, Measurements, Recurring |  |
Assets |  |
Real estate investments | 940,559 | 337,939
Limited partnerships and limited liability companies | 684,835 | 168,711
Derivative instruments | 431,727 | 1,277,480
Cash and cash equivalents | 1,919,669 | 4,508,982
Market risk benefits | 229,871 | 526,373
Assets | 45,024,575 | 58,137,654
Liabilities |  |
Market risk benefits | 2,455,492 | 3,162,162
Liabilities | 6,834,473 | 11,124,761
Fair Value, Measurements, Recurring | Funds withheld liability - embedded derivative |  |
Liabilities |  |
Derivative liabilities | (441,864) | (2,362)
Fair Value, Measurements, Recurring | Fixed index annuities - embedded derivatives |  |
Liabilities |  |
Derivative liabilities | 4,820,845 | 7,964,961
Fair Value, Measurements, Recurring | U.S. Government and agencies |  |
Assets |  |
Investments | 169,071 | 1,078,746
Fair Value, Measurements, Recurring | States, municipalities and territories |  |
Assets |  |
Investments | 3,822,982 | 3,927,201
Fair Value, Measurements, Recurring | Foreign corporate securities and foreign governments |  |
Assets |  |
Investments | 676,852 | 402,545
Fair Value, Measurements, Recurring | Corporate securities |  |
Assets |  |
Investments | 24,161,921 | 34,660,234
Fair Value, Measurements, Recurring | Residential mortgage backed securities |  |
Assets |  |
Investments | 1,377,611 | 1,125,049
Fair Value, Measurements, Recurring | Commercial mortgage backed securities |  |
Assets |  |
Investments | 3,687,478 | 4,840,311
Fair Value, Measurements, Recurring | Other asset backed securities |  |
Assets |  |
Investments | 5,908,702 | 5,271,857
Fair Value, Measurements, Recurring | Other investments |  |
Assets |  |
Investments | 1,013,297 | 12,226
Fair Value, Measurements, Recurring | NAV |  |
Assets |  |
Real estate investments | 0 | 0
Limited partnerships and limited liability companies | 620,626 | 168,711
Derivative instruments | 0 | 0
Cash and cash equivalents | 0 | 0
Market risk benefits | 0 | 0
Assets | 620,626 | 168,711
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 | 1,919,669 | 4,508,982
Market risk benefits | 0 | 0
Assets | 2,344,133 | 4,574,419
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 | 26,184 | 32,737
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 | 32,700
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 | 398,280 | 0
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 | 431,727 | 1,277,480
Cash and cash equivalents | 0 | 0
Market risk benefits | 0 | 0
Assets | 39,979,911 | 52,523,863
Liabilities |  |
Market risk benefits | 0 | 0
Liabilities | 0 | (2,362)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Funds withheld liability - embedded derivative |  |
Liabilities |  |
Derivative liabilities | 0 | (2,362)
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 | 142,887 | 1,046,009
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | States, municipalities and territories |  |
Assets |  |
Investments | 3,822,982 | 3,927,201
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign corporate securities and foreign governments |  |
Assets |  |
Investments | 676,852 | 402,545
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate securities |  |
Assets |  |
Investments | 23,759,573 | 34,627,534
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential mortgage backed securities |  |
Assets |  |
Investments | 1,377,611 | 1,125,049
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial mortgage backed securities |  |
Assets |  |
Investments | 3,687,478 | 4,840,311
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other asset backed securities |  |
Assets |  |
Investments | 5,465,784 | 5,271,857
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other investments |  |
Assets |  |
Investments | 615,017 | 5,877
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Real estate investments | 940,559 | 337,939
Limited partnerships and limited liability companies | 64,209 | 0
Derivative instruments | 0 | 0
Cash and cash equivalents | 0 | 0
Market risk benefits | 229,871 | 526,373
Assets | 2,079,905 | 870,661
Liabilities |  |
Market risk benefits | 2,455,492 | 3,162,162
Liabilities | 6,834,473 | 11,127,123
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Funds withheld liability - embedded derivative |  |
Liabilities |  |
Derivative liabilities | (441,864) | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Fixed index annuities - embedded derivatives |  |
Liabilities |  |
Derivative liabilities | 4,820,845 | 7,964,961
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 | 0 | 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 | 402,348 | 0
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 | 442,918 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other investments |  |
Assets |  |
Investments | $ 0 | $ 6,349

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