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Fair Values of Financial Instruments (Narrative) (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
USD ($)
Basis_Points
variable_interest_entities
Dec. 31, 2021
USD ($)
Fair Value Disclosures [Abstract]    
FHLB common stock $ 12,000  
Equity method investments, fair value 1,083,500 $ 520,100
Short-term loans, fair value 237,500 320,000
Collateral loans, fair value 64,600 0
COLI, fair value 394,600 $ 384,300
Variable interest entity, fair value $ 56,600  
Variable Interest Entity, Primary Beneficiary, Real Estate Investment 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 1  
Significant Unobservable Inputs (Level 3) | Real Estate Investments | Fair Value, Measurements, Recurring | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash flow modeling period 10 years  
Minimum | Short-Term Debt Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term debt securities, maturity period 3 months  
Maximum | Short-Term Debt Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term debt securities, maturity period 12 months  
Measurement Input, Residual Capitalization Rate | Minimum | Significant Unobservable Inputs (Level 3) | Real Estate Investments | Fair Value, Measurements, Recurring | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Real estate investments, measurement input 4.75%  
Measurement Input, Residual Capitalization Rate | Maximum | Significant Unobservable Inputs (Level 3) | Real Estate Investments | Fair Value, Measurements, Recurring | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Real estate investments, measurement input 6.50%  
Measurement Input, Residual Capitalization Rate | Average | Significant Unobservable Inputs (Level 3) | Real Estate Investments | Fair Value, Measurements, Recurring | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Real estate investments, measurement input 4.97%  
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) | Basis_Points (100)  
Fixed index annuities embedded derivative, adjustment due to change in discount rate $ 408,000  
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate $ 148,400  
Measurement Input, Discount Rate | Minimum | Significant Unobservable Inputs (Level 3) | Real Estate Investments | Fair Value, Measurements, Recurring | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Real estate investments, measurement input 6.00%  
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) | Basis_Points 100  
Fixed index annuities embedded derivative, adjustment due to change in discount rate $ (356,000)  
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate $ (127,500)  
Measurement Input, Discount Rate | Maximum | Significant Unobservable Inputs (Level 3) | Real Estate Investments | Fair Value, Measurements, Recurring | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Real estate investments, measurement input 7.75%  
Measurement Input, Discount Rate | Average | Significant Unobservable Inputs (Level 3) | Real Estate Investments | Fair Value, Measurements, Recurring | Valuation Technique, Discounted Cash Flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Real estate investments, measurement input 6.73%