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Other employee benefits (Tables)
12 Months Ended
Dec. 31, 2018
Statements [Line Items]  
Disclosure of additional information about other employee benefit plans [Table Text Block]
   Year ended 
   Dec. 31, 2018  Dec. 31, 2017 
 Opening defined benefit obligation$ 107,829 $ 89,005 
    Current service cost1 3,455  2,614 
    Past service cost 255   
    Interest cost 3,683  3,567 
    Effects of movements in exchange rates (8,587) 7,026 
    Remeasurement actuarial (gains)/losses:      
          Arising from changes in demographic assumptions (9,996) 1,172 
          Arising from changes in financial assumptions 2,809  6,761 
          Arising from experience adjustments (3,472) (120)
    Benefits paid (2,448) (2,196)
 Closing defined benefit obligation$ 93,528 $ 107,829 
Disclosure of additional information about other employee benefit plans, balance by member group [Table Text Block]
   Dec. 31, 2018  Dec. 31, 2017  Jan. 1, 2017 
 Active members$ 47,249 $ 64,460 $ 52,611 
 Inactive members 46,279  43,369  36,394 
 Closing defined benefit obligation$ 93,528 $ 107,829 $ 89,005 
Disclosure of changes in fair value of assets of other employee benefits plan [Table Text Block]
   Dec. 31, 2018  Dec. 31, 2017  Jan. 1, 2017 
 Employer contributions$ 2,448 $ 2,196 $ 1,949 
 Benefits paid (2,448) (2,196) (1,949)
 Closing fair value of assets$ — $ — $ — 
Disclosure of net benefit liability for other employee benefits [Table Text Block]
   Dec. 31, 2018  Dec. 31, 2017  Jan 1, 2017 
 Unfunded benefit obligation$ 93,528 $ 107,829 $ 89,005 
 Vacation accrual and other - non-current 2,664  3,324  2,624 
 Net liability$ 96,192 $ 111,153 $ 91,629 
Disclosure of detailed information about other employee benefits plan [Table Text Block]
   Dec. 31, 2018  Dec. 31, 2017  Jan 1, 2017 
 Other employee benefits liability - current (note 14)$ 2,564 $ 2,756 $ 2,356 
 Other employee benefits liability - non-current 93,628  108,397  89,273 
 Net liability$ 96,192 $ 111,153 $ 91,629 
Disclosure of detailed information about employee future benefit expense [Table Text Block]
   Dec. 31, 2018  Dec. 31, 2017 
 Current service cost 1$ 3,710 $ 2,614 
 Net interest cost 3,683  3,567 
 Components recognized in consolidated income statements$ 7,393 $ 6,181 
Disclosure of detailed information about remeasurement of other long term employee benefits [Table Text Block]
   Dec. 31, 2018  Dec. 31, 2017 
    Remeasurement on the net defined benefit liability:      
      Actuarial (gains)/losses arising from changes in demographic assumptions$ (9,996)$1,172 
      Actuarial (gains)/losses arising from changes in financial assumptions 2,809  6,761 
      Actuarial gains arising from changes experience adjustments (3,472) (120)
 Components recognized in statements of comprehensive income$ (10,659)$ 7,813 
        
 Total other employee future benefit cost$ (3,266)$ 13,994 
Disclosure of other employee benefit plan, assumptions used [Table Text Block]
   Dec. 31, 2018  Dec. 31, 2017 
 Defined benefit cost:      
    Discount rate 3.64%  4.03% 
    Initial weighted average health care trend rate 5.97%  6.13% 
    Ultimate weighted average health care trend rate 4.00%  4.00% 
    Average longevity at retirement age for current pensioners (years):    
          Males 21.0  21.6 
          Females 23.7  24.1 
 
   Dec. 31, 2018  Dec. 31, 2017 
 Defined benefit obligation:      
    Discount rate 3.88%  3.64% 
    Initial weighted average health care trend rate 5.74%  5.97% 
    Ultimate weighted average health care trend rate 4.00%  4.00% 
    Average longevity at retirement age for current pensioners (years):    
          Males 21.1  21.0 
          Females 23.9  23.7 
    Average longevity at retirement age for current employees (future pensioners) (years):    
          Males 23.0  22.9 
          Females 25.6  25.5