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Fair Values of Financial Instruments (Quantitative Information About Level 3 Fair Value Measurements) (Details)) - Fair Value, Measurements, Recurring $ in Thousands | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Real estate investments | $ 1,248,703 | $ 1,217,271
Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Real estate investments | 1,248,703 | 1,217,271
Real estate investments | Significant Unobservable Inputs (Level 3) | Broker Price Opinion |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Real estate investments | 1,248,703 | 1,217,271
Limited Partnerships and Limited Liability Companies, Real Estate | Significant Unobservable Inputs (Level 3) | Discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Variable interest entity, fair value | $ 32,974 | $ 46,705
Limited Partnerships and Limited Liability Companies, Real Estate | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Minimum | Discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Limited partnerships and limited liability companies, measurement input | 6.50% | 6.50%
Limited Partnerships and Limited Liability Companies, Real Estate | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Minimum | Residual capitalization rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Limited partnerships and limited liability companies, measurement input | 5.19% | 5.25%
Limited Partnerships and Limited Liability Companies, Real Estate | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Maximum | Discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Limited partnerships and limited liability companies, measurement input | 6.75% | 6.75%
Limited Partnerships and Limited Liability Companies, Real Estate | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Maximum | Residual capitalization rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Limited partnerships and limited liability companies, measurement input | 5.45% | 5.25%
Limited Partnerships and Limited Liability Companies, Real Estate | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Weighted Average | Discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Limited partnerships and limited liability companies, measurement input | 6.63% | 6.61%
Limited Partnerships and Limited Liability Companies, Real Estate | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Weighted Average | Residual capitalization rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Limited partnerships and limited liability companies, measurement input | 5.32% | 5.25%
Limited Partnerships and Limited Liability Companies, Infrastructure | Significant Unobservable Inputs (Level 3) | Discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Variable interest entity, fair value | $ 109,681 | $ 106,426
Limited Partnerships and Limited Liability Companies, Infrastructure | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Minimum | Discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Limited partnerships and limited liability companies, measurement input | 10.75% | 11.00%
Limited Partnerships and Limited Liability Companies, Infrastructure | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Maximum | Discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Limited partnerships and limited liability companies, measurement input | 10.75% | 11.00%
Limited Partnerships and Limited Liability Companies, Infrastructure | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Weighted Average | Discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Limited partnerships and limited liability companies, measurement input | 10.75% | 11.00%
Corporate securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments | $ 19,264,788 | $ 20,603,416
Corporate securities | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments | 210,316 | 255,437
Corporate securities | Significant Unobservable Inputs (Level 3) | Discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments | $ 83,513 | $ 83,666
Unobservable liquidity premium, basis points | 0.0020 | 0.0020
Other asset backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments | $ 5,773,257 | $ 6,058,198
Other asset backed securities | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments | 2,284,805 | 1,590,974
Other asset backed securities | Significant Unobservable Inputs (Level 3) | Discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments | $ 1,399,798 | $ 591,992
Other asset backed securities | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Minimum | Discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.0320 | 0.0526
Other asset backed securities | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Minimum | Weighted average lives |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Weighted average lives | 1 year 1 month 17 days | 1 year 1 month 20 days
Other asset backed securities | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Maximum | Discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.2500 | 0.2500
Other asset backed securities | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Maximum | Weighted average lives |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Weighted average lives | 11 years 9 months 7 days | 12 years 1 month 2 days
Other asset backed securities | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Weighted Average | Discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, measurement input | 0.0644 | 0.0692
Other asset backed securities | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Weighted Average | Weighted average lives |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Weighted average lives | 4 years 4 months 20 days | 5 years 8 months 8 days

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