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Investments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Schedule of Investments [Line Items]      
Loans acquired $ 0 $ 0  
Loans sold 0 0  
Gross Unrealized Losses 1,929,746   $ 2,160,856
Fixed maturity purchased with credit deterioration 0   0
Accrued Investment Income Write Down 0 0  
Securities sold under agreements to repurchase $ 0   $ 0
Commercial mortgage loans, Percentage 100.00%   100.00%
Loans on non-accrual status recognized in interest income $ 1,000 $ 0  
Loans on non-accrual status, do not have allowance for credit losses 5,000   $ 2,000
Commercial mortgage and other loans purchased with credit deterioration 0   0
Twelve Months or More, Gross Unrealized Losses 1,754,173   1,893,641
Commercial mortgage loans | Extended Maturity      
Schedule of Investments [Line Items]      
Financing Receivable, Modified, Weighted Average Term Increase from Modification   1 year  
NAIC high or highest quality rating | Fixed maturities      
Schedule of Investments [Line Items]      
Gross Unrealized Losses 1,849,000   2,059,000
NAIC other than high or highest quality rating | Fixed maturities      
Schedule of Investments [Line Items]      
Gross Unrealized Losses $ 81,000   102,000
California      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 24.00%    
Florida      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 8.00%    
Texas      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 8.00%    
Europe      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 9.00%    
Mexico      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 1.00%    
Australia      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 1.00%    
Other Income | Fixed maturities | Trading      
Schedule of Investments [Line Items]      
Net unrealized investment gains (losses) $ 87,800 $ (81,300)  
Other Income | Equity securities      
Schedule of Investments [Line Items]      
Net unrealized investment gains (losses) (93,600) $ (12,200)  
Fixed maturities      
Schedule of Investments [Line Items]      
Twelve Months or More, Gross Unrealized Losses $ 1,754,000   $ 1,894,000