v3.26.3
Variable Interest Entities (Schedule of Aggregate Assets, Liabilities, and Our Exposure to Loss from those VIEs) (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Variable Interest Entity [Line Items]    
Assets $ 45,281,836 $ 41,270,782
Total liabilities 39,235,668 35,293,465
Variable Interest Entity Not Primary Beneficiary [Member] | Debt and equity [member]    
Variable Interest Entity [Line Items]    
Assets 892,944 872,292
Total liabilities 272,958 265,722
Maximum Exposure to Loss 50,058 46,940
Variable Interest Entity Not Primary Beneficiary [Member] | Miscellaneous Investments [Member]    
Variable Interest Entity [Line Items]    
Assets 519,371 501,229
Total liabilities 271,897 264,951
Maximum Exposure to Loss 50,058 46,940
Variable Interest Entity Not Primary Beneficiary [Member] | Partnership Interest [Member]    
Variable Interest Entity [Line Items]    
Assets 373,573 371,063
Total liabilities 1,061 771
Maximum Exposure to Loss $ 0 $ 0