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v3.22.4

Income taxes - Tax rate reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Tax rate reconciliation |  |  |
(Loss) / income before income tax benefit / (expense) for the period | $ (128,259) | $ 332,806 | $ (141,443)
Expected income tax benefit / (expense) at the tax rate enacted in the Netherlands (2022: 25.8%, 2021: 25.0%, 2020: 25.0%) | 33,091 | (83,201) | 35,361
Non-deductible expenses | (11,129) | (9,182) | (5,041)
Other net change in valuation allowance | (20,591) | 88,857 | (30,568)
Difference in tax rates between the Netherlands and the U.S. as well as other foreign countries | 99 | 309 | 247
Release of valuation allowance related to expected future taxable income of U.S. operations | (20,593) | 88,858 | (30,568)
Total income tax benefit / (expense) | $ 1,470 | $ (3,217) | $ 16,419
Enacted tax rate | 25.80% | 25.00% | 25.00%
Non-deductible expenses, Share-based compensation | $ 8,500 | $ 6,700 | $ 5,800
Fair value loss on contingent consideration | $ 1,900 | $ 2,000 | 0
U.S. operations |  |  |
Tax rate reconciliation |  |  |
Release of valuation allowance related to expected future taxable income of U.S. operations |  |  | $ 16,419
Enacted tax rate | 21.00% |  |

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