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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 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets |  |  |
Derivative instruments | $ 733,784 | $ 431,727 | [1]
Market risk benefits | 346,515 | 229,871 | [1]
Liabilities |  |  |
Market risk benefits | 2,552,907 | 2,455,492 | [1]
Fair Value, Measurements, Recurring |  |  |
Assets |  |  |
Real estate investments | 1,191,255 | 940,559 |
Limited partnerships and limited liability companies | 1,172,525 | 684,835 |
Derivative instruments | 733,784 | 431,727 |
Cash and cash equivalents | 10,188,438 | 1,919,669 |
Market risk benefits | 346,515 | 229,871 |
Assets | 46,441,672 | 45,024,575 |
Liabilities |  |  |
Market risk benefits | 2,552,907 | 2,455,492 |
Liabilities | 6,631,138 | 6,834,473 |
Fair Value, Measurements, Recurring | U.S. Government and agencies |  |  |
Assets |  |  |
Investments | 162,885 | 169,071 |
Fair Value, Measurements, Recurring | States, municipalities and territories |  |  |
Assets |  |  |
Investments | 2,564,670 | 3,822,982 |
Fair Value, Measurements, Recurring | Foreign corporate securities and foreign governments |  |  |
Assets |  |  |
Investments | 428,227 | 676,852 |
Fair Value, Measurements, Recurring | Corporate securities |  |  |
Assets |  |  |
Investments | 19,211,380 | 24,161,921 |
Fair Value, Measurements, Recurring | Residential mortgage backed securities |  |  |
Assets |  |  |
Investments | 1,342,984 | 1,377,611 |
Fair Value, Measurements, Recurring | Commercial Mortgage-Backed Securities [Member] |  |  |
Assets |  |  |
Investments | 2,983,030 | 3,687,478 |
Fair Value, Measurements, Recurring | Other asset backed securities |  |  |
Assets |  |  |
Investments | 5,391,756 | 5,908,702 |
Fair Value, Measurements, Recurring | Other investments |  |  |
Assets |  |  |
Investments | 724,223 | 1,013,297 |
Fair Value, Measurements, Recurring | Funds withheld liability - embedded derivative |  |  |
Liabilities |  |  |
Derivative liabilities | (525,960) | (441,864) |
Fair Value, Measurements, Recurring | Fixed index annuities - embedded derivatives |  |  |
Liabilities |  |  |
Derivative liabilities | 4,604,191 | 4,820,845 |
Fair Value, Measurements, Recurring | NAV |  |  |
Assets |  |  |
Real estate investments | 0 | 0 |
Limited partnerships and limited liability companies | 1,023,691 | 620,626 |
Derivative instruments | 0 | 0 |
Cash and cash equivalents | 0 | 0 |
Market risk benefits | 0 | 0 |
Assets | 1,023,691 | 620,626 |
Liabilities |  |  |
Market risk benefits | 0 | 0 |
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 [Member] |  |  |
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 | 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 | 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 | 10,188,438 | 1,919,669 |
Market risk benefits | 0 | 0 |
Assets | 10,606,429 | 2,344,133 |
Liabilities |  |  |
Market risk benefits | 0 | 0 |
Liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | U.S. Government and agencies |  |  |
Assets |  |  |
Investments | 27,068 | 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 [Member] |  |  |
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 | 390,923 | 398,280 |
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 | Significant Other Observable Inputs (Level 2) |  |  |
Assets |  |  |
Real estate investments | 0 | 0 |
Limited partnerships and limited liability companies | 0 | 0 |
Derivative instruments | 733,784 | 431,727 |
Cash and cash equivalents | 0 | 0 |
Market risk benefits | 0 | 0 |
Assets | 31,998,174 | 39,979,911 |
Liabilities |  |  |
Market risk benefits | 0 | 0 |
Liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government and agencies |  |  |
Assets |  |  |
Investments | 135,817 | 142,887 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | States, municipalities and territories |  |  |
Assets |  |  |
Investments | 2,442,796 | 3,822,982 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign corporate securities and foreign governments |  |  |
Assets |  |  |
Investments | 428,227 | 676,852 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate securities |  |  |
Assets |  |  |
Investments | 18,959,540 | 23,759,573 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential mortgage backed securities |  |  |
Assets |  |  |
Investments | 1,342,984 | 1,377,611 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial Mortgage-Backed Securities [Member] |  |  |
Assets |  |  |
Investments | 2,983,030 | 3,687,478 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other asset backed securities |  |  |
Assets |  |  |
Investments | 4,638,696 | 5,465,784 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other investments |  |  |
Assets |  |  |
Investments | 333,300 | 615,017 |
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 Unobservable Inputs (Level 3) |  |  |
Assets |  |  |
Real estate investments | 1,191,255 | 940,559 |
Limited partnerships and limited liability companies | 148,834 | 64,209 |
Derivative instruments | 0 | 0 |
Cash and cash equivalents | 0 | 0 |
Market risk benefits | 346,515 | 229,871 |
Assets | 2,813,378 | 2,079,905 |
Liabilities |  |  |
Market risk benefits | 2,552,907 | 2,455,492 |
Liabilities | 6,631,138 | 6,834,473 |
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 | 121,874 | 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 | 251,840 | 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 [Member] |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other asset backed securities |  |  |
Assets |  |  |
Investments | 753,060 | 442,918 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other investments |  |  |
Assets |  |  |
Investments | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Funds withheld liability - embedded derivative |  |  |
Liabilities |  |  |
Derivative liabilities | (525,960) | (441,864) |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Fixed index annuities - embedded derivatives |  |  |
Liabilities |  |  |
Derivative liabilities | $ 4,604,191 | $ 4,820,845 |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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