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Share-based compensation - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 30, 2011 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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 |  |  | 27 | 129
Related income tax (expense) benefit |  | (599) | 2,763 | 966
Restricted share units | 2011 equity incentive plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total fair value of share units |  | 0 | 514 | 1,026
Phantom RSU award | Phantom RSU award plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated share-based compensation expense |  | $ 971 | $ 15,586 | $ 7,448
Class A |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued during the period (in shares) |  | 8,088 | 60,424 | 116,223
Number of shares pending issuance in connection with partial vesting (in shares) |  | 0 |  |
Common stock | Class A |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued during the period (in shares) |  | 8,088 | 60,424 | 116,223
Accumulated compensation expense |  | $ 60 | $ 514 | $ 1,024
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% |  |
Third 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% |  |
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% |  |

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