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Income taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Income Taxes [Line Items] |  |
Net deferred tax asset | $ 60,632 | $ 50,500
Non-current deferred tax assets | 67,802 | 55,567
Non-current deferred tax liabilities | 7,170 | $ 5,067
Temporary differences related to investments in foreign subsidiaries | 210,825 |
Tax Year 2009 to 2016 |  |
Income Taxes [Line Items] |  |
Estimate of possible loss | $ 177,000 |

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