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Share-based compensation - Restricted stock units - Changes in TRSUs (Details) - $ / shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Balance as at the end (none of which are vested) 370,364    
Time Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Balance as at the beginning 677,739 908,209 546,935
Balance as at the beginning, Weighted average fair value at grant date $ 7.7 $ 5.31 $ 4.44
RSU granted (in shares) 134,175 172,034 760,810
RSUs Granted during the period, Weighted average fair value at grant date $ 16.99 $ 14.7 $ 5.5
RSUs vested (in shares) (528,157) (402,504) (399,536)
RSUs vested during the period, Weighted average fair value at grant date $ (7.19) $ (5.3) $ (4.47)
Balance as at the end (none of which are vested) 283,757 677,739 908,209
Balance as at the end (none of which are vested), Weighted average fair value at grant date $ 13.04 $ 7.7 $ 5.31
Time Restricted stock units | Equity Incentive Plan 2013 [Member] | Officers And Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSU granted (in shares) 2,017,203