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Share capital - Summary of share capital (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Number of Shares    
Shares issued upon exercise of share options, for cash (in shares) 618,915 56,644
Shares issued to the public (in shares) 8,353,042 6,104,958
Flow-through shares issued, net of costs and premium (in shares) 996,100  
Total    
Balance beginning of year $ 3,473,813  
Balance end of year $ 3,656,450 $ 3,473,813
Voting common shares    
Number of Shares    
Beginning balance (in shares) 164,963,324 158,801,722
Ending balance (in shares) 174,931,381 164,963,324
Share capital    
Total    
Balance beginning of year $ 3,054,563 $ 3,007,924
Shares issued upon exercise of share options, for cash 3,559 265
Estimated fair value of share options exercised transferred from contributed surplus 1,267 103
Increase (decrease) through shares issued to the public, net of share issuance costs 76,957 48,041
Share issuance cost (1,570) (1,770)
Flow-through shares issued, net of costs and premium 9,868  
Balance end of year $ 3,144,644 $ 3,054,563