v3.25.4
Share-based compensation - Time Restricted Stock Units - Changes in TRSUs (Details) - Time Restricted Stock Units
 12 Months Ended
Dec. 31, 2025
tranche
$ / shares
shares
Dec. 31, 2024
$ / shares
shares
Dec. 31, 2023
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Balance as at the beginning 283,757 677,739 908,209
Balance as at the beginning, Weighted average fair value at grant date | $ / shares $ 13.04 $ 7.7 $ 5.31
TRSUs granted during the year (in shares) 170,481 134,175 172,034
TRSUs granted during the year, Weighted average fair value at grant date | $ / shares $ 9.53 $ 16.99 $ 14.7
TRSUs vested during the year (in shares) (247,743) (528,157) (402,504)
TRSUs vested during the year, Weighted average fair value at grant date | $ / shares $ (8.02) $ (7.19) $ (5.3)
Balance as at the end (none of which are vested) 206,495 283,757 677,739
Balance as at the end (none of which are vested), Weighted average fair value at grant date | $ / shares $ 16.17 $ 13.04 $ 7.7
2013 Equity incentive plan | Officers and directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
TRSUs granted during the year (in shares) 2,187,684    
Number of tranches | tranche 3