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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
Mar. 31, 2024
Mar. 31, 2023
Schedule of Equity Method Investments [Line Items]    
Alternative investment income included in "Net investment income earned" on our Consolidated Statements of Income $ 107,849 $ 91,506
Investments Accounted For Under The Equity Method    
Schedule of Equity Method Investments [Line Items]    
Net investment income (loss) (346,000) (70,700)
Realized gains 1,830,800 1,722,300
Net change in unrealized appreciation (depreciation) 3,819,000 1,443,700
Net income 5,303,800 3,095,300
Alternative investments    
Schedule of Equity Method Investments [Line Items]    
Alternative investment income included in "Net investment income earned" on our Consolidated Statements of Income $ 6,881 $ 7,768