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Employee benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Employee Benefits      
Current service cost $ 222 $ 2,187 $ 6,518
Interest cost on benefit obligation 983 1,109 692
Net period cost $ 1,205 $ 3,296 $ 7,210