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Marketable Securities - Net Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Net investment income        
Debt securities (including realized losses) $ 3,000 $ 2,225 $ 5,069 $ 5,634
Other investments 2,140 1,941 4,402 2,727
Gross investment income (including realized losses) 5,140 4,166 9,471 8,361
Investment expenses (40) (68) (70) (138)
Net investment income $ 5,100 $ 4,098 $ 9,401 $ 8,223