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Share-based compensation - Summary of Phantom RSU Award Activity (Details) - Phantom RSU award - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Phantom RSU award plan          
Units          
Units, beginning balance (in shares) 2,711,755 2,040,488 1,690,484    
Forfeitures (in shares) (180,272) (128,919) (329,027)    
Units, ending balance (in shares) 3,200,187 2,711,755 2,040,488 1,690,484  
Nonvested          
Number of unites outstanding (in shares) 3,200,187        
Current share price (in dollars per share) $ 12.69        
Total fair value of the plan $ 40,610        
Weighted-average accumulated percentage of service 65.73%        
Accrued liability $ 26,693        
Compensation expense not yet recognized $ 13,917        
Weighted-average period for recognition 1 year 9 months 7 days        
2019          
Units          
Vesting and partial vesting (in shares) (59,616) (63,257) (173,916)    
Settlement          
Partial vesting grant in value $ 512 $ 431 $ 1,104    
2019 | Second anniversary of grant date          
Units          
Grant (in shares)         186,081
2019 | Third anniversary of grant date          
Units          
Grant (in shares)         93,040
2019 | Fourth anniversary of grant date          
Units          
Grant (in shares)         93,040
2019 | Fifth anniversary of grant date          
Units          
Grant (in shares)         1,300,496
2020          
Units          
Vesting and partial vesting (in shares)     (65,440)    
Settlement          
Vesting grant in value     $ 416    
2020 | First anniversary of grant date          
Units          
Grant (in shares)       65,440  
2021          
Units          
Grant (in shares)     918,387    
Vesting and partial vesting (in shares)   (44,093)      
Settlement          
Vesting grant in value   $ 320      
2021 | First anniversary of grant date          
Units          
Grant (in shares)     44,093    
2021 | Third anniversary of grant date          
Units          
Grant (in shares)     874,294    
2022          
Units          
Grant (in shares)   907,536      
Vesting and partial vesting (in shares) (41,055)        
Settlement          
Vesting grant in value $ 326        
2022 | First anniversary of grant date          
Units          
Grant (in shares)   41,055      
2022 | Third anniversary of grant date          
Units          
Grant (in shares)   866,481      
2023          
Units          
Grant (in shares) 769,375        
2023 | First anniversary of grant date          
Units          
Grant (in shares) 32,599        
2023 | Third anniversary of grant date          
Units          
Grant (in shares) 736,776