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Common shares - Summary of restricted stock awards (Details) | 12 Months Ended
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Dec. 31, 2025 shares $ / shares | Dec. 31, 2024 shares $ / shares | Dec. 31, 2023 shares $ / shares
Number of Shares |  |  |
Number of shares, outstanding and non-vested (in shares) | 3,793,883 | 3,231,060 |
Number of shares, outstanding and non-vested (in shares) | 4,597,824 | 3,793,883 | 3,231,060
Restricted Stock |  |  |
Number of Shares |  |  |
Number of shares, outstanding and non-vested (in shares) |  | 3,231,060 |
Number of shares, granted (in shares) | 1,847,748 | 1,472,800 |
Number of shares, vested (in shares) | (1,042,307) | (905,643) |
Number of shares, forfeited (in shares) | (1,500) | (4,334) |
Number of shares, outstanding and non-vested (in shares) |  |  | 3,231,060
Weighted average grant date fair value, outstanding and non-vested (in USD per share) | $ / shares | $ 53.98 | $ 38.57 |
Weighted average grant date fair value, granted (in USD per share) | $ / shares | 44.79 |  |
Weighted average grant date fair value, vested (in USD per share) | $ / shares | 39.95 | 27.4 |
Weighted average grant date fair value, forfeited (in USD per share) | $ / shares | 56.22 | 69.38 |
Weighted average grant date fair value, outstanding and non-vested (in USD per share) | $ / shares | $ 53.46 | 53.98 | $ 38.57
2013 Equity Incentive Plan | Restricted Stock |  |  |
Number of Shares |  |  |
Number of shares, granted (in shares) | 1,847,748 |  |
Weighted average grant date fair value, granted (in USD per share) | $ / shares | $ 44.79 | $ 71.49 | $ 55.61

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