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Taxation - Provision for consolidated income tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Current income tax	$ (13,425)	$ (21,505)	$ (2,163)
Deferred income tax	19,493	12,118	10,117
Income tax benefit / (expense)	$ 6,068	$ (9,387)	$ 7,954

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

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