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Income tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Income tax [Line Items]      
Current tax $ (48,449) $ (12,359) $ (7,262)
Deferred income tax (Note 18) 5,304 555 24,316
Tax expense (income), continuing operations $ (43,145) $ (11,804) $ 17,054