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Results for the Year - Income tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Results for the Year    
Current income tax benefit (expense) $ 161 $ (244,288)
Deferred income tax benefit (expense) 43 (23,107)
Income tax benefit (expense) reported in the statement of profit or loss $ 204 $ (267,395)