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Investments (Aggregated Income Statement Summarized Financial Information for Partnerships in our Alternative Investment Portfolio) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Schedule of Equity Method Investments [Line Items]            
Net investment income earned $ 388,650   $ 288,155   $ 326,589  
Investments Accounted For Under The Equity Method [Member]            
Schedule of Equity Method Investments [Line Items]            
Net investment income (loss)   $ 178,000   $ 765,000   $ 653,000
Realized gains   5,845,000   12,590,000   6,121,000
Net change in unrealized appreciation (depreciation)   5,810,000   (5,215,000)   26,877,000
Net Income   11,833,000   8,140,000   33,651,000
Alternative Investments [Member]            
Schedule of Equity Method Investments [Line Items]            
Net investment income earned $ 26,777 $ 26,800 $ 23,003 $ 23,000 $ 117,701 $ 117,700