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Share capital - Summary of Share Capital (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Number of Shares |  |
Shares issued upon exercise of share options, for cash (in shares) | 56,644 |
Shares issued to the public (in shares) | 6,104,958 |
Total |  |
Balance beginning of year | $ 3,347,086 |
Balance end of year | $ 3,473,813 | $ 3,347,086
Voting common shares |  |
Number of Shares |  |
Beginning balance (in shares) | 158,801,722 | 158,801,722,000
Ending balance (in shares) | 164,963,324 | 158,801,722
Share capital |  |
Total |  |
Balance beginning of year | $ 3,007,924 | $ 3,007,924
Shares issued upon exercise of share options, for cash | 265 | 0
Estimated fair value of share options exercised transferred from contributed surplus | 103 |
Increase (decrease) through shares issued to the public, net of share issuance costs | 48,041 |
Share issuance cost | (1,770) |
Balance end of year | $ 3,054,563 | $ 3,007,924

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