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Investments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Schedule of Investments [Line Items]          
Loans acquired $ 14,100 $ 0 $ 14,100 $ 0  
Loans sold 0 0 0 0  
Gross Unrealized Losses 2,201,250   2,201,250   $ 1,739,561
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, do not have allowance for credit losses $ 3,000   $ 3,000   $ 0
Commercial mortgage and other loans purchased with credit deterioration     0   0
Twelve Months or More, Gross Unrealized Losses 2,069,200   2,069,200   1,699,993
Commercial mortgage loans | Extended Maturity          
Schedule of Investments [Line Items]          
Financing Receivable, Modified in Period, Amount 9,000 0 $ 17,000 0  
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage     1.00%    
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 2,071,000   $ 2,071,000   1,634,000
NAIC other than high or highest quality rating | Fixed maturities          
Schedule of Investments [Line Items]          
Gross Unrealized Losses $ 130,000   $ 130,000   106,000
California          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 27.00%   27.00%    
Texas          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 9.00%   9.00%    
Washington          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 7.00%   7.00%    
Europe          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 10.00%   10.00%    
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) $ (50,900) (53,500) $ (132,200) 42,600  
Other Income | Equity securities          
Schedule of Investments [Line Items]          
Net unrealized investment gains (losses) (9,200) $ (1,100) (21,400) $ 8,100  
Fixed maturities          
Schedule of Investments [Line Items]          
Twelve Months or More, Gross Unrealized Losses $ 2,069,000   $ 2,069,000   $ 1,700,000