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Basic and diluted earnings per share - Ordinary share (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net (loss) / income attributable to ordinary shares	$ (126,789)	$ 329,589	$ (125,024)
Weighted-average number of ordinary shares outstanding - basic	46,735,045	45,986,467	44,466,365
Weighted-average number of ordinary shares outstanding - diluted	46,735,045	46,840,972	44,466,365
Employee share purchase plan (ESPP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangements		1,299
Stock options | Previous plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangements		746,044
Non-vested RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangements		107,162

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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