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Variable Interest Entities (Schedule of Aggregate Assets, Liabilities, and Our Exposure to Loss from those VIEs) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]    
Assets $ 38,934,504 $ 37,727,460
Total liabilities 33,377,424 32,433,029
Variable Interest Entity Not Primary Beneficiary [Member] | Debt and equity [member]    
Variable Interest Entity [Line Items]    
Assets 715,256 798,266
Total liabilities 196,364 278,602
Maximum Exposure to Loss 39,890 40,088
Variable Interest Entity Not Primary Beneficiary [Member] | Miscellaneous Investments [Member]    
Variable Interest Entity [Line Items]    
Assets 401,672 456,286
Total liabilities 195,379 277,924
Maximum Exposure to Loss 39,890 40,088
Variable Interest Entity Not Primary Beneficiary [Member] | Partnership Interest [Member]    
Variable Interest Entity [Line Items]    
Assets 313,584 341,980
Total liabilities 985 678
Maximum Exposure to Loss $ 0 $ 0