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Share-based compensation - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 30, 2011
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   327 1,564 1,884
Related income tax (expense) benefit   75 (244) (422)
Restricted Share Units | 2011 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total fair value of share units   $ 1,773 $ 3,475 $ 3,295
Grant (in shares)       35,000
Phantom RSU Award | Phantom RSU Award Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant (in shares)   918,387 65,440 1,672,657
Allocated share-based compensation expense   $ 3,452 $ 1,232 $ 2,102
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%    
Grant (in shares)   44,093    
Second Anniversary of Grant Date | Stock Option | 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 | 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 | Stock Option | 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 | 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%    
Grant (in shares)   874,294    
Fourth Anniversary of Grant Date | Stock Option | 2011 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage   20.00%    
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 | Stock Option | 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   251,623 472,130 470,558
Class A | Partial Vesting 2019        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares pending issuance in connection with partial vesting   17,242    
Class A | Partial Vesting 2020        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of shares pending for issuance in connection with partial vesting   $ 120    
Common Stock | Class A        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares issued during the period   251,623 472,130 470,558
Accumulated compensation expense   $ 1,766 $ 3,399 $ 3,359