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Marketable Securities - Proceeds and Realized Gains and Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sales $ 0 $ 2,464 $ 0 $ 4,920
Gross realized capital losses $ 0 $ 17 $ 0 $ 39