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Investments - Investment Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net Investment Income      
Realized gains $ 80,435 $ 215,845 $ 47,288
Unrealized (losses) gains (412,193) 43,632 374,033
Investment (loss) income (331,758) 259,477 421,321
Total investments held      
Net Investment Income      
Unrealized (losses) gains $ (276,500) $ 109,400 $ 392,700