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Investments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Schedule of Investments [Line Items]      
Loans Acquired $ 0 $ 0  
Loans Sold 29,000 0  
Commercial mortgage and others loans Purchased with Credit Deterioration 0   $ 0
Accrued Investment Income Write Down 0 0  
Repurchase agreements 0   0
Securities Lending $ 205,301   $ 0
Commercial mortgage loans, Percentage 100.00%   100.00%
Fixed maturities purchased with credit deterioration $ 0   $ 0
Fixed maturities      
Schedule of Investments [Line Items]      
Gross Unrealized Losses 413,395   85,245
Gross unrealized losses of twelve months or more concentrated in various sectors 57,136   11,189
NAIC high or highest quality rating | Fixed maturities      
Schedule of Investments [Line Items]      
Gross Unrealized Losses 371,200   72,900
NAIC other than high or highest quality rating | Fixed maturities      
Schedule of Investments [Line Items]      
Gross Unrealized Losses $ 42,200   12,300
California      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 34.00%    
Texas      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 18.00%    
New York      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 7.00%    
Europe      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 6.00%    
Mexico      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 1.00%    
Other Income | Fixed maturities | Trading      
Schedule of Investments [Line Items]      
Unrealized Gain (Loss) on Investments $ (800) (552,300)  
Other Income | Equity Securities      
Schedule of Investments [Line Items]      
Unrealized Gain (Loss) on Investments (22,300) $ (15,700)  
Fixed maturities      
Schedule of Investments [Line Items]      
Gross unrealized losses of twelve months or more concentrated in various sectors $ 57,100   $ 11,200