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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.