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Investments - Fair Value, Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Marketable Securities [Line Items] |  |
Estimated Fair Value | $ 278,344 | $ 137,620
Obligations of U.S. Government and its agencies |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 277,358 | 129,371
Corporate debt securities |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value |  | 6,092
Certificates of deposit |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 986 | 2,157
Fair Value, Inputs, Level 1 |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Inputs, Level 1 | Obligations of U.S. Government and its agencies |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Inputs, Level 1 | Corporate debt securities |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value |  | 0
Fair Value, Inputs, Level 1 | Certificates of deposit |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Inputs, Level 2 |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 278,344 | 137,620
Fair Value, Inputs, Level 2 | Obligations of U.S. Government and its agencies |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 277,358 | 129,371
Fair Value, Inputs, Level 2 | Corporate debt securities |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value |  | 6,092
Fair Value, Inputs, Level 2 | Certificates of deposit |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 986 | 2,157
Fair Value, Inputs, Level 3 |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Inputs, Level 3 | Obligations of U.S. Government and its agencies |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Fair Value, Inputs, Level 3 | Corporate debt securities |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value |  | 0
Fair Value, Inputs, Level 3 | Certificates of deposit |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | $ 0 | $ 0

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