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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
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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