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Common shares - Summary of restricted stock awards (Details)
 12 Months Ended
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