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Other employee benefits (Tables)
12 Months Ended
Dec. 31, 2022
Other Employee Benefits [Abstract]  
Disclosure of detailed information about other employee benefit plans [Table Text Block]
    Year ended  
    Dec. 31, 2022     Dec. 31, 2021  
Opening defined benefit obligation $ 128,843   $ 129,616  
Current service cost1   4,656     3,861  
Past service cost   -     134  
Curtailment (note 6e)   (1,801 )   -  
Interest cost   3,940     3,531  
Attribution period changes (note 6e)   (3,179 )   -  
Effects of movements in exchange rates   (6,074 )   639  
Remeasurement actuarial losses/(gains):            
Arising from changes in demographic assumptions   -     2,601  
Arising from changes in financial assumptions   (36,058 )   (7,309 )
Arising from experience adjustments   (516 )   (1,034 )
Benefits paid   (2,595 )   (3,196 )
Closing defined benefit obligation $ 87,216   $ 128,843  
Disclosure of detailed information about other employee benefit plans, balance by member group [Table Text Block]
    Dec. 31, 2022     Dec. 31, 2021  
Active members $ 58,482   $ 57,775  
Inactive members   28,734     71,068  
Closing defined benefit obligation $ 87,216   $ 128,843  
Disclosure of detailed information about changes in fair value of assets of other employee benefits plan [Table Text Block]
    Dec. 31, 2022     Dec. 31, 2021  
Employer contributions $ 2,595   $ 3,196  
Benefits paid   (2,595 )   (3,196 )
Closing fair value of assets $ -   $ -  
Disclosure of detailed information about net benefit liability for other employee benefits [Table Text Block]
    Dec. 31, 2022     Dec. 31, 2021  
Unfunded benefit obligation $ 87,216   $ 128,843  
Vacation accrual and other - non-current   2,607     3,275  
Net liability $ 89,823   $ 132,118  
Disclosure of detailed information about other employee benefits plan [Table Text Block]
    Dec. 31, 2022     Dec. 31, 2021  
Other employee benefits liability - current (note 14) $ 3,483   $ 3,530  
Other employee benefits liability - non-current   86,340     128,588  
Net liability $ 89,823   $ 132,118  
Disclosure of detailed information about employee future benefit expense [Table Text Block]
    Dec. 31, 2022     Dec. 31, 2021  
Current service cost 1 $ 2,855   $ 3,995  
Net interest cost   3,940     3,531  
Components recognized in consolidated income statements $ 6,795   $ 7,526  
Disclosure of detailed information about remeasurement of other long term employee benefits [Table Text Block]
    Dec. 31, 2022     Dec. 31, 2021  
Remeasurement on the net defined benefit liability:            
Actuarial losses arising from changes in demographic assumptions $ -   $ 2,601  
Actuarial gains arising from changes in financial assumptions   (36,058 )   (7,309 )
Actuarial gains arising from changes experience adjustments   (516 )   (1,034 )
Components recognized in statements of comprehensive income $ (36,574 ) $ (5,742 )
             
Total other employee future benefit cost $ 29,779   $ 1,784  
Disclosure of detailed information about other employee benefit plan, assumptions used [Table Text Block]
  Dec. 31, 2022 Dec. 31, 2021
Defined benefit cost:    
Discount rate 3.30% 2.76%
Initial weighted average health care trend rate 6.00% 5.66%
Ultimate weighted average health care trend rate 4.00% 4.00%
Average longevity at retirement age for current pensioners (years)1 :    
Males 20.4    20.3   
Females 23.7    23.7   
 
  Dec. 31, 2022 Dec. 31, 2021
Defined benefit obligation:    
Discount rate 5.27% 3.30%
Initial weighted average health care trend rate 5.92% 6.00%
Ultimate weighted average health care trend rate 4.00% 4.00%
Average longevity at retirement age for current pensioners (years)1 :    
Males 20.4    20.4   
Females 23.8    23.7   
Average longevity at retirement age for current employees (future pensioners) (years)1 :    
Males 22.3    22.3   
Females 25.5    25.4