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Income and other taxes - Schedule of Income and Other Taxes by Geography (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax [Line Items]
Income tax expense	$ 147,592	$ 7,330
Mali
Income Tax [Line Items]
Income tax expense	97,399	(22,155)
Namibia
Income Tax [Line Items]
Income tax expense	18,814	13,492
Philippines
Income Tax [Line Items]
Income tax expense	14,812	12,493
Nicaragua
Income Tax [Line Items]
Income tax expense	15,231	4,440
Canada
Income Tax [Line Items]
Income tax expense	0	(188)
Other
Income Tax [Line Items]
Income tax expense	$ 1,336	$ (752)

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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