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Investments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Schedule of Investments [Line Items]          
Loans acquired $ 27,600 $ 0 $ 27,600 $ 0  
Loans Sold 24,800 0 24,800 0  
Fixed Maturity Purchased with Credit Deterioration     0   $ 0
Accrued Investment Income Write Down 0 0 0 0  
Securities sold under agreements to repurchase $ 0   $ 0   $ 0
Commercial mortgage loans, Percentage 100.00%   100.00%   100.00%
Commercial Mortgage and other loans purchased with Credit Deterioration     $ 0   $ 0
Fixed maturities          
Schedule of Investments [Line Items]          
Gross Unrealized Losses $ 1,802,509   1,802,509   113,531
Twelve Months or More, Gross Unrealized Losses 157,625   157,625   19,435
NAIC high or highest quality rating | Fixed maturities          
Schedule of Investments [Line Items]          
Gross Unrealized Losses 1,627,800   1,627,800   95,100
NAIC other than high or highest quality rating | Fixed maturities          
Schedule of Investments [Line Items]          
Gross Unrealized Losses $ 174,700   $ 174,700   18,400
California          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 23.00%   23.00%    
Texas          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 12.00%   12.00%    
Europe          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 13.00%   13.00%    
Australia          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 3.00%   3.00%    
Mexico          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 2.00%   2.00%    
New York          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 6.00%   6.00%    
Other Income | Fixed maturities | Trading          
Schedule of Investments [Line Items]          
Unrealized Gain (Loss) on Investments $ (184,100) 200 $ (520,500) (2,500)  
Other Income | Equity securities          
Schedule of Investments [Line Items]          
Unrealized Gain (Loss) on Investments (10,000) $ 500 (14,100) $ 100  
Fixed maturities          
Schedule of Investments [Line Items]          
Twelve Months or More, Gross Unrealized Losses $ 157,600   $ 157,600   $ 19,400