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Variable Interest Entities (Schedule of Aggregate Assets, Liabilities, and Our Exposure to Loss from those VIEs) (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Variable Interest Entity [Line Items]    
Assets $ 40,383,727 $ 39,895,540
Total liabilities 34,845,541 34,208,770
Variable Interest Entity Not Primary Beneficiary [Member] | Debt and equity [member]    
Variable Interest Entity [Line Items]    
Assets 755,662 732,072
Total liabilities 208,544 193,397
Maximum Exposure to Loss 41,243 40,130
Variable Interest Entity Not Primary Beneficiary [Member] | Miscellaneous Investments [Member]    
Variable Interest Entity [Line Items]    
Assets 416,903 400,188
Total liabilities 207,759 191,170
Maximum Exposure to Loss 41,243 40,130
Variable Interest Entity Not Primary Beneficiary [Member] | Partnership Interest [Member]    
Variable Interest Entity [Line Items]    
Assets 338,759 331,884
Total liabilities 785 2,227
Maximum Exposure to Loss $ 0 $ 0