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Fair Values of Financial Instruments (Narrative) (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 USD ($) limitedPartnership entity | Dec. 31, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
FHLB common stock | $ 10,000 | $ 22,000 |
Short-term loans, fair value | 0 | 316,400 |
Collateral loans, fair value | 64,600 | 64,600 |
COLI, fair value | $ 404,900 | $ 397,700 |
Expected cost of annual call options | 2.35% | 2.40% |
Coinsurance ceded, fixed index annuities embedded derivatives | $ 14,628,884 | $ 13,254,956 | [1]
Fixed index annuities - embedded derivatives |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Coinsurance ceded, fixed index annuities embedded derivatives | $ 1,074,400 | 1,173,400 |
Limited partnership funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Variable interest entities, number of consolidated variable interest entities | limitedPartnership | 2 |  |
Unfunded commitments | $ 510,600 | 926,300 |
Fair Value, Measurements, Recurring | Corporate securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | 19,211,380 | 24,161,921 |
Fair Value, Measurements, Recurring | Other asset backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | 5,391,756 | 5,908,702 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | 251,840 | 402,348 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Other asset backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | $ 753,060 | 442,918 |
Significant Unobservable Inputs (Level 3) | Debt Securities | Fair Value, Measurements, Recurring | Discounted cash flow |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unobservable liquidity premium, basis points | 0.0020 |  |
Significant Unobservable Inputs (Level 3) | Debt Securities | Fair Value, Measurements, Recurring | Discounted cash flow | Corporate securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | $ 77,700 | 84,700 |
Significant Unobservable Inputs (Level 3) | Debt Securities | Fair Value, Measurements, Recurring | Discounted cash flow | Other asset backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments | $ 604,500 | 296,800 |
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 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Variable interest entity, fair value | $ 100,000 |  |
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 |  |
Variable interest entity, fair value | $ 49,800 | $ 64,200 |
Measurement Input, Residual Capitalization Rate | Minimum | 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] |  |  |
Real estate investments, measurement input | 4.75% | 4.75% |
Measurement Input, Residual Capitalization Rate | Minimum | 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] |  |  |
Limited partnerships and limited liability companies, measurement input | 5.00% | 4.25% |
Measurement Input, Residual Capitalization Rate | Maximum | 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] |  |  |
Real estate investments, measurement input | 6.50% | 6.50% |
Measurement Input, Residual Capitalization Rate | Maximum | 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] |  |  |
Limited partnerships and limited liability companies, measurement input | 5.00% | 4.75% |
Measurement Input, Residual Capitalization Rate | Weighted Average | 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] |  |  |
Limited partnerships and limited liability companies, measurement input | 5.00% | 4.46% |
Measurement Input, Residual Capitalization Rate | Average | 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] |  |  |
Real estate investments, measurement input | 5.41% | 5.44% |
Measurement Input, 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 | $ 352,200 |  |
Measurement Input, Discount Rate | Minimum | Significant Unobservable Inputs (Level 3) | Debt Securities | Fair Value, Measurements, Recurring | Discounted cash flow |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, measurement input | 0.0587 | 0.0404 |
Measurement Input, Discount Rate | Minimum | 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] |  |  |
Real estate investments, measurement input | 6.00% | 6.00% |
Measurement Input, Discount Rate | Minimum | 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] |  |  |
Limited partnerships and limited liability companies, measurement input | 6.50% | 5.75% |
Measurement Input, 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 | $ (307,900) |  |
Measurement Input, Discount Rate | Maximum | Significant Unobservable Inputs (Level 3) | Debt Securities | Fair Value, Measurements, Recurring | Discounted cash flow |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, measurement input | 0.2500 | 0.2858 |
Measurement Input, Discount Rate | Maximum | 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] |  |  |
Real estate investments, measurement input | 7.88% | 8.00% |
Measurement Input, Discount Rate | Maximum | 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] |  |  |
Limited partnerships and limited liability companies, measurement input | 6.50% | 6.00% |
Measurement Input, Discount Rate | Weighted Average | Significant Unobservable Inputs (Level 3) | Debt Securities | Fair Value, Measurements, Recurring | Discounted cash flow |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, measurement input | 0.0731 | 0.0436 |
Measurement Input, Discount Rate | Weighted Average | 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] |  |  |
Limited partnerships and limited liability companies, measurement input | 6.50% | 5.86% |
Measurement Input, Discount Rate | Average | 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] |  |  |
Real estate investments, measurement input | 6.84% | 6.91% |
Measurement Input, Expected Term | Minimum | Significant Unobservable Inputs (Level 3) | Debt Securities | Fair Value, Measurements, Recurring | Discounted cash flow |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, term | 1 year 2 months 12 days | 8 years 9 months 14 days |
Measurement Input, Expected Term | Maximum | Significant Unobservable Inputs (Level 3) | Debt Securities | Fair Value, Measurements, Recurring | Discounted cash flow |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, term | 12 years 3 months 7 days | 12 years 5 months 23 days |
Measurement Input, Expected Term | Weighted Average | Significant Unobservable Inputs (Level 3) | Debt Securities | Fair Value, Measurements, Recurring | Discounted cash flow |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities, term | 5 years 10 months 28 days | 9 years 3 months 14 days |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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