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Investments (Aggregated Income Statement Summarized Financial Information for Partnerhips in our Alternative Investment Portfolio) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Schedule of Equity Method Investments [Line Items]        
Net investment income earned $ 100,863 $ 63,889 $ 290,065 $ 206,713
Investments accounted for under the equity method [Member]        
Schedule of Equity Method Investments [Line Items]        
Net investment income (loss) 74,300 205,600 (66,900) 612,000
Realized gains 1,108,500 1,983,500 3,752,800 10,964,900
Net change in unrealized appreciation (depreciation) 2,216,300 (3,188,900) 7,414,100 (1,973,000)
Net income 3,399,100 (999,800) 11,100,000 9,603,900
Alternative Investments [Member]        
Schedule of Equity Method Investments [Line Items]        
Net investment income earned $ 6,473 $ (5,581) $ 25,637 $ 22,821