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Employee benefits - Sensitivity analysis (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Defined benefit Plan +0.5%    
Statement [line items]    
Discount rate $ (230) $ (238)
Rate of increase in compensation levels 245 255
Defined benefit Plan -0.5%    
Statement [line items]    
Discount rate 251 261
Rate of increase in compensation levels $ (227) $ (235)