Basic and diluted earnings per share - Ordinary share (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net income / (loss) attributable to ordinary shares	$ (39,061)	$ 399,468	$ (85,739)	$ 357,912
Weighted-average number of ordinary shares outstanding - basic	46,668,554	46,037,900	46,634,026	45,754,766
Weighted-average number of ordinary shares outstanding - diluted	46,668,554	46,929,870	46,634,026	46,678,835
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangements		2,124		1,454
Stock options | Previous plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangements		797,165		824,101
Non-vested RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangements		92,681		98,514