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Income taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Income Taxes [Line Items] |  |
Net deferred tax asset | $ 96,997 | $ 84,041
Non-current deferred tax assets | 98,163 | 87,972
Non-current deferred tax liabilities | 1,166 | $ 3,931
Temporary differences related to investments in foreign subsidiaries | 343,520 |
Tax Year 2009 to 2017 |  |
Income Taxes [Line Items] |  |
Estimate of possible loss | $ 250,000 |

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