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Fair Values of Financial Instruments (Quantitative Information About Level 3 Fair Value Measurements) (Details) - Fair Value, Measurements, Recurring $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate investments	$ 1,217,271	$ 940,559
Significant Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate investments	1,217,271	940,559
Real estate investments | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate investments		$ 940,559
Real estate investments | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Minimum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate investments, measurement input		6.00%
Real estate investments | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Minimum | Residual Capitalization Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate investments, measurement input		4.75%
Real estate investments | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Maximum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate investments, measurement input		8.00%
Real estate investments | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Maximum | Residual Capitalization Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate investments, measurement input		6.50%
Real estate investments | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Weighted Average | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate investments, measurement input		6.91%
Real estate investments | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Weighted Average | Residual Capitalization Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate investments, measurement input		5.44%
Real estate investments | Significant Unobservable Inputs (Level 3) | Broker price opinion
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate investments	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]
Limited partnerships and limited liability companies	$ 46,705	$ 64,209
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%	5.75%
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	5.25%	4.25%
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%	6.00%
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	5.25%	4.75%
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	6.61%	5.86%
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	5.25%	4.46%
Limited Partnerships and Limited Liability Companies, Infrastructure | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Limited partnerships and limited liability companies	$ 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	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	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	11.00%
Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments	$ 20,603,416	$ 24,161,921
Corporate securities | Significant Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments	255,437	402,348
Corporate securities | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments	$ 83,666	$ 84,674
Unobservable liquidity premium, basis points	0.0020	0.0020
Other asset backed securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments	$ 6,058,198	$ 5,908,702
Other asset backed securities | Significant Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments	1,590,974	442,918
Other asset backed securities | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments	$ 591,992	$ 296,800
Other asset backed securities | Significant Unobservable Inputs (Level 3) | Discounted cash flow | Minimum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fixed maturity securities, measurement input	0.0526	0.0404
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]
Fixed maturity securities, weighted average lives	1 year 1 month 20 days	8 years 9 months 14 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]
Fixed maturity securities, measurement input	0.2500	0.2858
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]
Fixed maturity securities, weighted average lives	12 years 1 month 2 days	12 years 5 months 23 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]
Fixed maturity securities, measurement input	0.0692	0.0436
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]
Fixed maturity securities, weighted average lives	5 years 8 months 8 days	9 years 3 months 14 days

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