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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

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