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Investments (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Investments [Line Items]      
Loans acquired $ 1,344,000 $ 0  
Loans sold 69,000 0  
Fixed Maturity Purchased with Credit Deterioration 0 0  
Accrued Investment Income Write Down 100 0  
Securities sold under agreements to repurchase $ 0 $ 0  
Commercial mortgage loans, Percentage 100.00% 100.00%  
Commercial mortgage and other loans purchased with credit deterioration $ 0 $ 0  
Fixed maturities, available-for-sale 13,278,166 7,012,631  
Fair value of collateral that could be sold or repledged 0 0  
Assets Deposited With Governmental Authorities 4,100 4,300  
Carrying value of non-income producing assets      
Schedule of Investments [Line Items]      
Fixed maturities, available-for-sale 24,800    
Fixed Maturities      
Schedule of Investments [Line Items]      
Fixed maturities, available-for-sale 13,278,166 7,012,631  
Gross Unrealized Losses 113,531 11,024  
Gross unrealized losses of twelve months or more concentrated in various sectors 19,435 9,322  
NAIC High or Highest Quality Rating | Fixed Maturities      
Schedule of Investments [Line Items]      
Gross Unrealized Losses 95,100 5,000  
NAIC Other Than High or Highest Quality Rating | Fixed Maturities      
Schedule of Investments [Line Items]      
Gross Unrealized Losses $ 18,400 6,000  
California      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 25.00%    
Texas      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 10.00%    
New York      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 7.00%    
Europe      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 13.00%    
Mexico      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 3.00%    
Australia      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 3.00%    
Other Income | Fixed Maturities | Trading      
Schedule of Investments [Line Items]      
Unrealized Gain (Loss) on Investments $ 156,100 9,100 $ 3,100
Other Income | Equity securities      
Schedule of Investments [Line Items]      
Unrealized Gain (Loss) on Investments 2,100 (1,200) $ (1,000)
Fixed Maturities      
Schedule of Investments [Line Items]      
Gross unrealized losses of twelve months or more concentrated in various sectors $ 19,400 $ 9,300