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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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