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Basic and diluted earnings per share - Ordinary share (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net (loss) / income attributable to ordinary shares	$ (36,531)	$ (53,775)	$ 321,381	$ (124,325)
Weighted-average number of ordinary shares outstanding - basic	46,152,404	44,471,844	45,888,769	44,379,924
Weighted-average number of ordinary shares outstanding - diluted	46,152,404	44,471,844	46,780,963	44,379,924
Stock options | Previous plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangements			784,942
Stock options | ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangements			1,382
Non-vested RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangements			105,870

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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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