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Employee benefits - Sensitivity analysis (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Discount rate  
Disclosure of sensitivity analysis for actuarial assumptions  
Increase in actuarial assumption 0.50%
Decrease in actuarial assumption 0.50%
Increase/(decrease) in defined benefit obligation, assuming increase in actuarial assumption $ 13,907
Increase/(decrease) in defined benefit obligation, assuming decrease in actuarial assumption $ 15,450
Statutory minimum wage increase rate  
Disclosure of sensitivity analysis for actuarial assumptions  
Increase in actuarial assumption 0.50%
Decrease in actuarial assumption 0.50%
Increase/(decrease) in defined benefit obligation, assuming increase in actuarial assumption $ 14,928
Increase/(decrease) in defined benefit obligation, assuming decrease in actuarial assumption $ 14,380
Salary increase rate  
Disclosure of sensitivity analysis for actuarial assumptions  
Increase in actuarial assumption 0.50%
Decrease in actuarial assumption 0.50%
Increase/(decrease) in defined benefit obligation, assuming increase in actuarial assumption $ 15,196
Increase/(decrease) in defined benefit obligation, assuming decrease in actuarial assumption $ 14,135