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Fair Values of Financial Instruments (Narrative) (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) Basis_Points variable_interest_entities Investment | Dec. 31, 2021 USD ($) | Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Expected cost of annual call options | 2.40% | 2.10% | 2.10% | 2.90%
Coinsurance deposits (net of allowance for credit losses of $8,737 as of 2022 and $2,264 as of 2021) | $ 13,254,956 | $ 8,988,891 |  |
Fixed index annuities - embedded derivatives |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Coinsurance deposits (net of allowance for credit losses of $8,737 as of 2022 and $2,264 as of 2021) | $ 1,173,400 | 1,245,000 |  |
Variable Interest Entity, Primary Beneficiary, 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 | variable_interest_entities | 2 |  |  |
Unfunded commitments | $ 926,300 |  |  |
Minimum | Measurement Input, Discount Rate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value, sensitivity, discount rate adjustment (basis points) | Basis_Points | (0.0100) |  |  |
Fixed index annuities embedded derivative, adjustment due to change in discount rate | $ 386,400 |  |  |
Maximum | Measurement Input, Discount Rate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value, sensitivity, discount rate adjustment (basis points) | Basis_Points | 0.0100 |  |  |
Fixed index annuities embedded derivative, adjustment due to change in discount rate | $ (336,200) |  |  |
Fair Value, Measurements, Recurring | Corporate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value | 24,161,921 | 34,660,234 |  |
Fair Value, Measurements, Recurring | Other asset backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value | 5,908,702 | 5,271,857 |  |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value | 402,348 | 0 |  |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other asset backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value | $ 442,918 | 0 |  |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Fixed Maturity Securities | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Unobservable liquidity premium, basis points | 0.0020 |  |  |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Fixed Maturity Securities | Discounted cash flow | Corporate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value | $ 84,700 | 0 |  |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Fixed Maturity Securities | Discounted cash flow | Other asset backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value | $ 296,800 | 0 |  |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Real estate investments | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash flow modeling period | 10 years |  |  |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Limited partnerships and limited liability companies | 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 | variable_interest_entities | 2 |  |  |
Variable interest entity, fair value | $ 64,200 |  |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value | 23,759,573 | 34,627,534 |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other asset backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value | $ 5,465,784 | $ 5,271,857 |  |
Fair Value, Measurements, Recurring | Minimum | Equity Securities and Short-Term Debt Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment maturity period | 3 months |  |  |
Fair Value, Measurements, Recurring | Minimum | Significant Unobservable Inputs (Level 3) | Measurement Input, Discount Rate | Fixed Maturity Securities | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity securities, measurement input | 0.0404 |  |  |
Fair Value, Measurements, Recurring | Minimum | Significant Unobservable Inputs (Level 3) | Measurement Input, Discount Rate | Real estate investments | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Real estate investments, measurement input | 6.00% | 6.25% |  |
Fair Value, Measurements, Recurring | Minimum | Significant Unobservable Inputs (Level 3) | Measurement Input, Discount Rate | Limited partnerships and limited liability companies | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Limited partnerships and limited liability companies, measurement input | 5.75% |  |  |
Fair Value, Measurements, Recurring | Minimum | Significant Unobservable Inputs (Level 3) | Measurement Input, Expected Term | Fixed Maturity Securities | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity securities, weighted average lives | 8 years 9 months 14 days |  |  |
Fair Value, Measurements, Recurring | Minimum | Significant Unobservable Inputs (Level 3) | Measurement Input, Cap Rate | Real estate investments | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Real estate investments, measurement input | 4.75% | 5.00% |  |
Fair Value, Measurements, Recurring | Minimum | Significant Unobservable Inputs (Level 3) | Measurement Input, Cap Rate | Limited partnerships and limited liability companies | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Limited partnerships and limited liability companies, measurement input | 4.25% |  |  |
Fair Value, Measurements, Recurring | Maximum | Equity Securities and Short-Term Debt Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment maturity period | 12 months |  |  |
Fair Value, Measurements, Recurring | Maximum | Significant Unobservable Inputs (Level 3) | Measurement Input, Discount Rate | Fixed Maturity Securities | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity securities, measurement input | 0.2858 |  |  |
Fair Value, Measurements, Recurring | Maximum | Significant Unobservable Inputs (Level 3) | Measurement Input, Discount Rate | Real estate investments | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Real estate investments, measurement input | 8.00% | 7.50% |  |
Fair Value, Measurements, Recurring | Maximum | Significant Unobservable Inputs (Level 3) | Measurement Input, Discount Rate | Limited partnerships and limited liability companies | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Limited partnerships and limited liability companies, measurement input | 6.00% |  |  |
Fair Value, Measurements, Recurring | Maximum | Significant Unobservable Inputs (Level 3) | Measurement Input, Expected Term | Fixed Maturity Securities | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity securities, weighted average lives | 12 years 5 months 23 days |  |  |
Fair Value, Measurements, Recurring | Maximum | Significant Unobservable Inputs (Level 3) | Measurement Input, Cap Rate | Real estate investments | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Real estate investments, measurement input | 6.50% | 6.25% |  |
Fair Value, Measurements, Recurring | Maximum | Significant Unobservable Inputs (Level 3) | Measurement Input, Cap Rate | Limited partnerships and limited liability companies | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Limited partnerships and limited liability companies, measurement input | 4.75% |  |  |
Fair Value, Measurements, Recurring | Weighted Average | Significant Unobservable Inputs (Level 3) | Measurement Input, Discount Rate | Fixed Maturity Securities | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity securities, measurement input | 0.0436 |  |  |
Fair Value, Measurements, Recurring | Weighted Average | Significant Unobservable Inputs (Level 3) | Measurement Input, Discount Rate | Limited partnerships and limited liability companies | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Limited partnerships and limited liability companies, measurement input | 5.86% |  |  |
Fair Value, Measurements, Recurring | Weighted Average | Significant Unobservable Inputs (Level 3) | Measurement Input, Expected Term | Fixed Maturity Securities | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity securities, weighted average lives | 9 years 3 months 14 days |  |  |
Fair Value, Measurements, Recurring | Weighted Average | Significant Unobservable Inputs (Level 3) | Measurement Input, Cap Rate | Limited partnerships and limited liability companies | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Limited partnerships and limited liability companies, measurement input | 4.46% |  |  |
Fair Value, Measurements, Recurring | Average | Significant Unobservable Inputs (Level 3) | Measurement Input, Discount Rate | Real estate investments | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Real estate investments, measurement input | 6.91% | 6.97% |  |
Fair Value, Measurements, Recurring | Average | Significant Unobservable Inputs (Level 3) | Measurement Input, Cap Rate | Real estate investments | Discounted cash flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Real estate investments, measurement input | 5.44% | 5.72% |  |
Fair Value, Nonrecurring | Real estate investments | Variable Interest Entities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Number of real estate investments not measured at fair value on a recurring basis | Investment | 1 |  |  |
Fair Value, Nonrecurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
FHLB common stock | $ 22,000 |  |  |
Short-term loans, fair value | 316,400 | $ 320,000 |  |
Collateral loans, fair value | 64,600 | 0 |  |
COLI, fair value | $ 397,700 | $ 384,300 |  |

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