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Investments in debt and equity securities - Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized costs | $ 598,544 | $ 599,287
Fair values | 592,697 | 586,615
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized costs | 14,505 | 14,563
Fair values | 14,401 | 14,415
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized costs | 212,348 | 219,015
Fair values | 206,005 | 210,307
Foreign |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized costs | 317,246 | 316,247
Fair values | 318,070 | 313,619
U.S. Treasury Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized costs | 54,445 | 49,462
Fair values | $ 54,221 | $ 48,274

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