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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
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
Assets | 44,794,704 | 57,611,281
Liabilities |  |
Liabilities | 4,378,981 | 7,962,599
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
Assets | 620,626 | 168,711
Liabilities |  |
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
Assets | 2,344,133 | 4,574,419
Liabilities |  |
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
Assets | 39,979,911 | 52,523,863
Liabilities |  |
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
Assets | 1,850,034 | 344,288
Liabilities |  |
Liabilities | 4,378,981 | 7,964,961
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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