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OTHER LIABILITIES - NON CURRENT AND CURRENT OTHER LIABILITIES - NON CURRENT AND CURRENT (Other liabilities - Non-current) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other liabilities [Abstract]    
Post-employment benefits $ 275,950 $ 252,624
Other employee benefits 31,312 31,724
Asset retirement obligation (note 19) 27,829 18,301
Other 37,955 135
Other liabilities – Non-current $ 373,046 $ 302,784