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Marketable Securities - Net Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Net investment income        
Debt securities (including realized losses) $ 3,843 $ 2,280 $ 8,912 $ 7,914
Other investments 1,850 1,551 6,252 4,278
Gross investment income (including realized losses) 5,693 3,831 15,164 12,192
Investment expenses (45) (65) (115) (203)
Net investment income $ 5,648 $ 3,766 $ 15,049 $ 11,989