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Financial Instruments - Summary of Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Debt Securities, Available for Sale [Roll Forward] |  |
Fair value at beginning of period | $ 39,459 | $ 43,485
Purchases | 4,440 | 14,122
Redemptions | 0 | (3,310)
Maturities | (5,450) | (15,155)
Change in bond premium | (16) | (1,099)
Fair market value adjustment | 76 | 1,416
Fair value at end of period | $ 38,509 | $ 39,459

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