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Investments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Schedule of Investments [Line Items]          
Loans acquired $ 0 $ 14,100 $ 0 $ 14,100  
Loans sold 0 0 0 0  
Gross Unrealized Losses 1,710,753   1,710,753   $ 2,160,856
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%
Loans on non-accrual status recognized in interest income $ 1,000 $ 0 $ 1,000 $ 0  
Loans on non-accrual status, do not have allowance for credit losses 20,000   20,000   $ 2,000
Commercial mortgage and other loans purchased with credit deterioration     0   0
Twelve Months or More, Gross Unrealized Losses 1,582,237   1,582,237   1,893,641
Commercial mortgage loans | Extended Maturity          
Schedule of Investments [Line Items]          
Financing Receivable, Modified, Weighted Average Term Increase from Modification   1 year   1 year  
NAIC high or highest quality rating | Fixed maturities          
Schedule of Investments [Line Items]          
Gross Unrealized Losses 1,642,000   1,642,000   2,059,000
NAIC other than high or highest quality rating | Fixed maturities          
Schedule of Investments [Line Items]          
Gross Unrealized Losses $ 69,000   $ 69,000   102,000
California          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 23.00%   23.00%    
Texas          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 8.00%   8.00%    
Florida          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 8.00%   8.00%    
Europe          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 9.00%   9.00%    
Mexico          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 1.00%   1.00%    
Australia          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 1.00%   1.00%    
Other Income | Fixed maturities | Trading          
Schedule of Investments [Line Items]          
Net unrealized investment gains (losses) $ 107,500 $ (50,900) $ 195,300 $ (132,200)  
Other Income | Equity securities          
Schedule of Investments [Line Items]          
Net unrealized investment gains (losses) (45,900) $ (9,200) (139,500) $ (21,400)  
Fixed maturities          
Schedule of Investments [Line Items]          
Twelve Months or More, Gross Unrealized Losses $ 1,582,000   $ 1,582,000   $ 1,894,000