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Common shares - Summary of restricted stock awards (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($) shares $ / shares | Dec. 31, 2022 USD ($) shares $ / shares
Number of Shares |  |
Number of shares, outstanding and non-vested (in shares) | 2,705,989 |
Number of shares, outstanding and non-vested (in shares) | 3,231,060 | 2,705,989
Restricted Stock |  |
Number of Shares |  |
Number of shares, outstanding and non-vested (in shares) |  | 2,997,992
Number of shares, granted (in shares) | 1,817,750 | 1,047,997
Number of shares, vested (in shares) | (1,280,179) | (1,337,500)
Number of shares, forfeited (in shares) | (12,500) | (2,500)
Number of shares, outstanding and non-vested (in shares) |  |
Weighted average grant date fair value, outstanding and non-vested (in USD per share) | $ | $ 21.63 | $ 23.27
Weighted average grant date fair value, granted (in USD per share) | $ / shares | $ 55.61 | $ 21.39
Weighted average grant date fair value, vested (in USD per share) | $ | $ 27.11 | $ 25.11
Weighted average grant date fair value, forfeited (in USD per share) | $ | 24.27 | 16.66
Weighted average grant date fair value, outstanding and non-vested (in USD per share) | $ | $ 38.57 | $ 21.63

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