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Investments - Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Investments |  |
Amortized Cost, Current |  | $ 215
Amortized Cost, Due from one through five years | $ 3,524 | 3,518
Amortized Cost, Due from six through ten years | 2,836 | 2,836
Amortized Cost, Total | 6,360 | 6,569
Market Value, Current |  | 215
Market Value, Due from one through five years | 3,567 | 3,592
Market Value, Due from six through ten years | 2,800 | 2,830
Market Value, Total | $ 6,367 | $ 6,637

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