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INVESTMENTS - EQUITY SECURITIES - Summary of Cost and Fair Value of Investments in Equity Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net Investment Income [Line Items] |  |  |
Cost | $ 999 | $ 999 | $ 999
Unrealized gain (Loss) | 138 | (111) | 144
Fair value | $ 1,137 | $ 888 | $ 1,143

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