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Fair Value of Financial Instruments - Marketable Securities Portfolio (Details) - Debt securities (government) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Summary of marketable security portfolio |  |
Amortized Cost | $ 506,379 | $ 442,816
Net Unrealized Losses | (1,895) | (149)
Estimated Fair Value | $ 504,484 | $ 442,667
Minimum |  |
Summary of marketable security portfolio |  |
Contractual maturity dates | 12 months |
Maximum |  |
Summary of marketable security portfolio |  |
Contractual maturity dates | 18 months |

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