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Share-based compensation - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 30, 2011
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Accumulated compensation expense   $ 0 $ 0 $ 0  
2011 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of total outstanding shares of the entity immediately follow the IPO that is authorized under equity incentive plan 2.50%        
Share-based compensation expense   129 327 1,564  
Related income tax (expense) benefit   966 75 (244)  
Restricted Share Units | 2011 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total fair value of share units   1,026 1,773 3,475  
Phantom RSU Award | Phantom RSU Award Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated share-based compensation expense   $ 7,448 $ 3,452 $ 1,232  
Phantom RSU Award Type One | Phantom RSU Award Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grant (in shares)         465,202
Requisite service period         5 years
Phantom RSU Award Type Two | Phantom RSU Award Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grant (in shares)         1,207,455
Phantom RSU Award Type Two | Phantom RSU Award Plan 2020          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage       100.00%  
Grant (in shares)       65,440  
Phantom RSU Award Type Three | Phantom RSU Award Plan 2021          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage   100.00% 100.00%    
Grant (in shares)   41,055 44,093    
Second Anniversary of Grant Date | Restricted Share Units | 2011 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage   40.00%      
Second Anniversary of Grant Date | Phantom RSU Award Type One | Phantom RSU Award Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage         40.00%
Three Years Following The Grant Date | Restricted Share Units | 2011 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage   20.00%      
Three Years Following The Grant Date | Phantom RSU Award Type Three | Phantom RSU Award Plan 2021          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage   100.00% 100.00%    
Grant (in shares)   866,481 874,294    
Fourth Anniversary of Grant Date | Restricted Share Units | 2011 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage   20.00%      
Fifth Anniversary of Grant Date | Restricted Share Units | 2011 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage   20.00%      
Fifth Anniversary of Grant Date | Phantom RSU Award Type One | Phantom RSU Award Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage         20.00%
Fifth Anniversary of Grant Date | Phantom RSU Award Type Two | Phantom RSU Award Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage         100.00%
Class A          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares issued during the period (in shares)   116,223 251,623 472,130  
Number of shares pending issuance in connection with partial vesting (in shares)   7,885      
Value of shares pending for issuance in connection with partial vesting   $ 58      
Common Stock | Class A          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares issued during the period (in shares)   116,223 251,623 472,130  
Accumulated compensation expense   $ 1,024 $ 1,766 $ 3,399