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Basic and diluted earnings per share - Ordinary share (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income (Loss) for the period	$ 399,468	$ (42,551)	$ 357,912	$ (70,550)
Weighted Average Number of Shares Outstanding, Basic	46,037,900	44,387,463	45,754,766	44,333,460
Weighted-average number of ordinary shares outstanding - diluted	46,929,870	44,387,463	46,678,835	44,333,460
Stock options | Previous plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ShareBased payment arrangements	797,165		824,101
Stock options | ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ShareBased payment arrangements	2,124		1,454
Non-vested and earned RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ShareBased payment arrangements	92,681		98,514

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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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