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Investments in debt and equity securities - Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized costs	$ 606,446	$ 599,287
Fair values	606,018	586,615
Municipal
Debt Securities, Available-for-sale [Line Items]
Amortized costs	12,342	14,563
Fair values	12,314	14,415
Corporate
Debt Securities, Available-for-sale [Line Items]
Amortized costs	198,097	219,015
Fair values	195,396	210,307
Foreign
Debt Securities, Available-for-sale [Line Items]
Amortized costs	340,150	316,247
Fair values	342,146	313,619
U.S. Treasury Bonds
Debt Securities, Available-for-sale [Line Items]
Amortized costs	55,857	49,462
Fair values	$ 56,162	$ 48,274

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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