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Investments - Investment Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net Investment Income      
Realized gains $ 6,078 $ 80,435 $ 215,845
Unrealized (losses) gains (201,475) (412,193) 43,632
Investment (loss) income (195,397) (331,758) 259,477
Total investments held      
Net Investment Income      
Unrealized (losses) gains $ (58,800) $ (276,500) $ 109,400