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Investments in debt and equity securities - Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized costs	$ 609,597	$ 599,287
Fair values	605,048	586,615
Municipal
Debt Securities, Available-for-sale [Line Items]
Amortized costs	12,322	14,563
Fair values	12,248	14,415
Corporate
Debt Securities, Available-for-sale [Line Items]
Amortized costs	199,623	219,015
Fair values	195,174	210,307
Foreign
Debt Securities, Available-for-sale [Line Items]
Amortized costs	345,501	316,247
Fair values	345,388	313,619
U.S. Treasury Bonds
Debt Securities, Available-for-sale [Line Items]
Amortized costs	52,151	49,462
Fair values	$ 52,238	$ 48,274

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