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PROVISIONS - Provisions (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current provisions [abstract]    
Current moratorium provision $ 9,085 $ 67,130
Current restructuring provision 0 7,329
Current close down and restoration provision 978 8,347
Current other provisions 1,250  
Current provisions 11,313 82,806
Non-current provisions [abstract]    
Non-current moratorium provision 36,952  
Non-current restructuring provision 0 0
Non-current close down and restoration provision 57,352 55,562
Non-current provisions $ 94,304 $ 55,562