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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, amortized cost $ 38,537,462 $ 44,866,019  
Fixed maturity securities, available for sale, gross unrealized gains 237,889 225,792  
Fixed maturity securities, available for sale, gross unrealized losses (3,990,839) (5,283,847)  
Fixed maturity securities, available for sale, allowance for credit losses (4,030) (3,347) $ (2,846)
Fair value 34,780,482 39,804,617 [1]  
Accrued interest receivable $ 360,900 425,400  
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued investment income (2023 and 2022 include $2,862 and $3,444 related to consolidated variable interest entities)    
U.S. Government and agencies      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, amortized cost $ 172,683 173,638  
Fixed maturity securities, available for sale, gross unrealized gains 606 70  
Fixed maturity securities, available for sale, gross unrealized losses (2,148) (4,637)  
Fixed maturity securities, available for sale, allowance for credit losses 0 0  
Fair value 171,141 169,071  
States, municipalities and territories      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, amortized cost 3,654,571 4,356,251  
Fixed maturity securities, available for sale, gross unrealized gains 17,477 41,565  
Fixed maturity securities, available for sale, gross unrealized losses (573,108) (574,834)  
Fixed maturity securities, available for sale, allowance for credit losses 0 0 (2,776)
Fair value 3,098,940 3,822,982  
Foreign corporate securities and foreign governments      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, amortized cost 563,890 748,770  
Fixed maturity securities, available for sale, gross unrealized gains 1,669 11,661  
Fixed maturity securities, available for sale, gross unrealized losses (71,820) (83,579)  
Fixed maturity securities, available for sale, allowance for credit losses 0 0  
Fair value 493,739 676,852  
Corporate securities      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, amortized cost 23,036,862 27,706,440  
Fixed maturity securities, available for sale, gross unrealized gains 175,014 146,065  
Fixed maturity securities, available for sale, gross unrealized losses (2,605,048) (3,687,370)  
Fixed maturity securities, available for sale, allowance for credit losses (3,412) (3,214) 0
Fair value 20,603,416 24,161,921  
Residential mortgage backed securities      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, amortized cost 1,503,639 1,492,242  
Fixed maturity securities, available for sale, gross unrealized gains 11,598 11,870  
Fixed maturity securities, available for sale, gross unrealized losses (112,736) (126,368)  
Fixed maturity securities, available for sale, allowance for credit losses 0 (133) (70)
Fair value 1,402,501 1,377,611  
Commercial mortgage backed securities      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, amortized cost 3,405,647 4,098,755  
Fixed maturity securities, available for sale, gross unrealized gains 995 493  
Fixed maturity securities, available for sale, gross unrealized losses (454,095) (411,770)  
Fixed maturity securities, available for sale, allowance for credit losses 0 0  
Fair value 2,952,547 3,687,478  
Other asset backed securities      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, available for sale, amortized cost 6,200,170 6,289,923  
Fixed maturity securities, available for sale, gross unrealized gains 30,530 14,068  
Fixed maturity securities, available for sale, gross unrealized losses (171,884) (395,289)  
Fixed maturity securities, available for sale, allowance for credit losses (618) 0 $ 0
Fair value $ 6,058,198 $ 5,908,702  
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.