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Income and other taxes - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | $ 98,169 | $ 137,524 | $ 111,614
United States |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deductible temporary differences for which no deferred tax asset is recognised | 262,000 | $ 292,000 |
Trinidad |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Operating loss carryforwards | 59,800 |  |
Deferred tax assets | $ 20,900 |  |

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