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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
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Phantom RSU Award Plan |  |  |
Units |  |  |
Units, beginning balance (in shares) | 2,040,488 | 1,690,484 | 1,661,820
Forfeitures (in shares) | (128,919) | (329,027) | (31,614)
Units, ending balance (in shares) | 2,711,755 | 2,040,488 | 1,690,484
Settlement |  |  |
Partial vesting grant in value | $ 431 | $ 1,104 | $ 18
Vesting grant in value | $ 320 | $ 416 |
Nonvested |  |  |
Number of unites outstanding (in shares) | 2,711,755 |  |
Current share price (in dollars per share) | $ 8.36 |  |
Total fair value of the plan | $ 22,670 |  |
Weighted-average accumulated percentage of service | 52.69% |  |
Accrued liability | $ 11,945 |  |
Compensation expense not yet recognized | $ 10,725 |  |
Weighted-average period for recognition | 1 year 10 months 17 days |  |
2019 Grants |  |  |
Units |  |  |
Vesting and partial vesting (in shares) | (63,257) | (173,916) | (5,162)
2020 Grants |  |  |
Units |  |  |
Grant (in shares) |  |  | 65,440
Vesting and partial vesting (in shares) |  | (65,440) |
2021 Grants |  |  |
Units |  |  |
Grant (in shares) |  | 918,387 |
Vesting and partial vesting (in shares) | (44,093) |  |
2022 Grants |  |  |
Units |  |  |
Grant (in shares) | 907,536 |  |

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 9 -URI https://asc.fasb.org/extlink&oid=6409733&loc=d3e19512-108361 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6409875&loc=d3e20028-108363 + Details
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