v3.26.1
Variable Interest Entities (Schedule of Aggregate Assets, Liabilities, and Our Exposure to Loss from those VIEs) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Variable Interest Entity [Line Items]    
Assets $ 42,893,152 $ 41,270,782
Total liabilities 36,908,670 35,293,465
Variable Interest Entity Not Primary Beneficiary [Member] | Debt and equity [member]    
Variable Interest Entity [Line Items]    
Assets 964,890 872,292
Total liabilities 351,280 265,722
Maximum Exposure to Loss 47,778 46,940
Variable Interest Entity Not Primary Beneficiary [Member] | Miscellaneous Investments [Member]    
Variable Interest Entity [Line Items]    
Assets 589,720 501,229
Total liabilities 350,488 264,951
Maximum Exposure to Loss 47,778 46,940
Variable Interest Entity Not Primary Beneficiary [Member] | Partnership Interest [Member]    
Variable Interest Entity [Line Items]    
Assets 375,170 371,063
Total liabilities 792 771
Maximum Exposure to Loss $ 0 $ 0