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Income tax (Details) - USD ($) $ in Thousands	12 Months Ended
Income tax (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Income tax [Line Items]
Current tax	$ (101,456)	$ (48,449)	$ (12,359)
Deferred income tax (Note 18)	(4,784)	5,304	555
Tax expense (income), continuing operations	$ (106,240)	$ (43,145)	$ (11,804)

- Definition

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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