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Fair value measurements (Tables)
9 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
Schedule of Financial Instruments Measured at Fair Value on Recurring Basis
As of September 30, 2025, financial instruments measured at fair value on a recurring basis are summarized below:
Level 1Level 2
Fair value
measurements
 
(in $ thousands)
Investments in securities:
Debt securities:
Municipal— 12,314 12,314 
Corporate— 195,396 195,396 
Foreign— 342,146 342,146 
U.S. Treasury Bonds— 56,162 56,162 
Equity securities88,800 — 88,800 
88,800 606,018 694,818 

As of December 31, 2024, financial instruments measured at fair value on a recurring basis are summarized below:
Level 1Level 2
Fair value
measurements
 
(in $ thousands)
Investments in securities:
Debt securities:
Municipal— 14,415 14,415 
Corporate— 210,307 210,307 
Foreign— 313,619 313,619 
U.S. Treasury Bonds— 48,274 48,274 
Equity securities82,484 — 82,484 
82,484 586,615 669,099