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Investments - Fair Value, Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Marketable Securities [Line Items] |  |
Estimated Fair Value | $ 252,221 | $ 278,344
Obligations of U.S. Government and its agencies |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 251,240 | 277,358
Certificates of deposit |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 981 | 986
Quoted Price in Active Markets (Level 1) |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Quoted Price in Active Markets (Level 1) | Obligations of U.S. Government and its agencies |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Quoted Price in Active Markets (Level 1) | Certificates of deposit |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 252,221 | 278,344
Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government and its agencies |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 251,240 | 277,358
Significant Other Observable Inputs (Level 2) | Certificates of deposit |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 981 | 986
Significant Unobservable Inputs (Level 3) |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Significant Unobservable Inputs (Level 3) | Obligations of U.S. Government and its agencies |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Significant Unobservable Inputs (Level 3) | Certificates of deposit |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | $ 0 | $ 0

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