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Employee benefits - Changes in the Benefit Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Employee benefits      
Opening balance $ 9,550 $ 9,864 $ 9,586
Current cost of service 0 0 0
Interest cost 255 240 280
Actuarial gains loss (1,357) (135) 506
Settlement (7,739)    
Benefits paid (430) (419) (508)
Total benefit obligation (A) $ 279 $ 9,550 $ 9,864