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PROVISIONS - Provisions (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current provisions [abstract]    
Current moratorium provision $ 4,570 $ 9,085
Current close down and restoration provision 211 978
Current other provisions 7 1,250
Current provisions 4,788 11,313
Non-current provisions [abstract]    
Non-current moratorium provision 14,487 36,952
Non-current close down and restoration provision 61,961 57,352
Non-current provisions $ 76,448 $ 94,304