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Employee benefits - Sensitivity analysis (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Defined benefit Plan +0.5% [Member]    
IFRS Statement [Line Items]    
Defined Benefit Plan Calculating Benefit Obligation Discount Rate $ (272) $ (284)
Defined Benefit Plan Calculating Benefit Obligation Rate Of Compensation Increase 294 310
Defined benefit Plan -0.5% [Member]    
IFRS Statement [Line Items]    
Defined Benefit Plan Calculating Benefit Obligation Discount Rate 302 317
Defined Benefit Plan Calculating Benefit Obligation Rate Of Compensation Increase $ (268) $ (281)