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Income taxes - Tax rate reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	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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