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OTHER LIABILITIES - NON CURRENT AND CURRENT (Other liabilities - Non-current) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of other liabilities [Abstract]    
Post-employment benefits $ 432,648 $ 405,935
Other employee benefits 52,647 44,496
Asset retirement obligation 41,673 26,556
Other 24,888 30,616
Other liabilities – Non-current $ 551,856 $ 507,603