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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

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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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