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Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Components of Net Periodic Benefit Cost |  |  |  |  |
Service cost | $ 163 | $ 186 |  | $ 745 |
Interest cost | $ 341 | $ 336 |  | $ 1,345 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Net loss | $ 15 |  |  |  |
Net periodic benefit cost | $ 519 | $ 522 |  |  |

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