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Share capital - Summary of share capital (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Number of Shares    
Shares issued on redemption of performance share units (in shares) 885,750 339,540
Shares issued on redemption of performance share units (in shares) 528,166 514,010
Increase (Decrease) Through Shares Issued Through Acquisitions, Shares 0 5,788,187
Shares issued to the public (in shares) 19,037 0
Flow-through and other shares issued, net of issuance costs and premium (in shares) 694,500 1,100,000
Total    
Balance beginning of year $ 3,639,922  
Balance end of year $ 3,200,868 $ 3,639,922
Voting common shares    
Number of Shares    
Beginning balance (in shares) 182,673,118 174,931,381
Ending balance (in shares)   182,673,118
Share capital    
Total    
Balance beginning of year $ 3,225,326 $ 3,144,644
Shares issued upon exercise of share options, for cash 4,438 1,738
Shares issued on redemption of performance share units 2,256 1,202
Estimated fair value of share options exercised transferred from contributed surplus 1,787 684
Shares issued on acquisition of subsidiary 0 65,647
Shares issued upon exercise of warrants 213 0
Flow-through and other shares issued, net of issuance costs and premium 7,624 11,411
Balance end of year $ 3,241,644 $ 3,225,326