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Investment securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Current investments: |  |
Amortized cost | $ 312,621 | $ 376,532
Gross unrealized holding gains | 12 | 139
Estimated fair value | 312,633 | 376,671
Government debt securities (held-to-maturity) |  |
Current investments: |  |
Amortized cost | 312,621 | 376,532
Gross unrealized holding gains | 12 | 139
Estimated fair value | $ 312,633 | $ 376,671

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