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FINANCE INCOME AND EXPENSES - Interest expense and other financial expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Analysis of income and expense [abstract]    
Interest expense on convertible notes (note 14) $ (7,619) $ (7,619)
Accretion expense on convertible notes (note 14) (13,147) (11,969)
Accretion of close down and restoration provision (note 13) (3,380) (3,624)
Interest expense on bank loan 0 (513)
Interest on moratorium (7,616) 0
Other finance expenses (3,108) (2,243)
Total interest expense and other finance expenses $ (34,870) $ (25,968)