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Investments - Schedule of Aggregated Income Statement Summarized Financial Information for Partnerships in our Alternative Investment Portfolio (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Schedule of Equity Method Investments [Line Items]        
Net investment income earned $ 117,759 $ 100,863 $ 334,250 $ 290,065
Investments Accounted For Under The Equity Method        
Schedule of Equity Method Investments [Line Items]        
Net investment income (loss) 230,600 74,300 127,000 (66,900)
Realized gains 1,878,300 1,108,500 5,263,400 3,752,800
Net change in unrealized appreciation (depreciation) 607,700 2,216,300 7,277,000 7,414,100
Net income 2,716,600 3,399,100 12,667,400 11,100,000
Alternative investments        
Schedule of Equity Method Investments [Line Items]        
Net investment income earned $ 9,031 $ 6,473 $ 26,429 $ 25,637