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III. Financial Risk Management - Financial Assets and Liabilities Which Impact Profit and Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Argentine Peso / U.S. dollar foreign exchange risk [member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Currency exposure / functional currency $ (39,561) $ (95,811)
Euro / U.S. dollar foreign exchange risk [member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Currency exposure / functional currency (291,362) (103,518)
Saudi Arabian Riyal / US Dollar exchange risk [member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Currency exposure / functional currency $ (125,789) $ (107,582)