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Employee benefits - Sensitivity analysis (Details)
$ in Thousands
Dec. 31, 2022
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 $ 10,431
Increase/(decrease) in defined benefit obligation, assuming decrease in actuarial assumption $ 11,589
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 $ 11,197
Increase/(decrease) in defined benefit obligation, assuming decrease in actuarial assumption $ 10,789
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 $ 11,678
Increase/(decrease) in defined benefit obligation, assuming decrease in actuarial assumption $ 10,380