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Employee benefits - Changes in the Benefit Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Employee Benefits      
Benefit obligation at the beginning of the year $ 286 $ 279 $ 9,550
Current cost of service 0 0 0
Interest cost 12 12 255
Actuarial gain (loss) 54 180 (1,357)
Settlement 0 0 (7,739)
Benefits paid (81) (185) (430)
Benefit obligation at the end of the year $ 271 $ 286 $ 279