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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