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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Phantom RSU award plan |  |  |
Units |  |  |
Units, beginning balance (in shares) | 3,200,187 | 2,711,755 | 2,040,488
Forfeitures (in shares) | (5,139) | (180,272) | (128,919)
Units, ending balance (in shares) | 2,178,314 | 3,200,187 | 2,711,755
Nonvested |  |  |
Number of unites outstanding (in shares) | 2,178,314 |  |
Current share price (in dollars per share) | $ 7.28 |  |
Total fair value of the plan | $ 15,858 |  |
Weighted-average accumulated percentage of service | 57.63% |  |
Accrued liability | $ 9,139 |  |
Compensation expense not yet recognized | $ 6,719 |  |
Weighted-average period for recognition | 1 year 9 months 18 days |  |
2019 |  |  |
Units |  |  |
Vesting and partial vesting (in shares) | (943,288) | (59,616) | (63,257)
Settlement |  |  |
Partial vesting grant in value | $ 10,480 | $ 512 | $ 431
2021 |  |  |
Units |  |  |
Vesting and partial vesting (in shares) | (692,422) |  | (44,093)
Settlement |  |  |
Partial vesting grant in value | $ 7,693 |  |
Vesting grant in value |  |  | $ 320
2022 |  |  |
Units |  |  |
Grant (in shares) |  | 795,013 | 907,536
Vesting and partial vesting (in shares) | (32,599) | (41,055) |
Settlement |  |  |
Vesting grant in value | $ 351 | $ 326 |
2023 |  |  |
Units |  |  |
Grant (in shares) | 733,972 | 769,375 |
2024 |  |  |
Units |  |  |
Grant (in shares) | 651,575 |  |

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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 -Topic 710 -SubTopic 10 -Name Accounting Standards Codification -Section 25 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483070/710-10-25-9 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483043/710-10-30-2 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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