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Note 21 - Deferred Income Tax - Recovery Analysis of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets to be recovered after 12 months $ (205,590) $ (225,680)
Deferred tax liabilities to be settled after 12 months 254,801 336,982
Later than one year [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets to be recovered after 12 months (640,603) (538,274)
Deferred tax liabilities to be settled after 12 months $ 840,892 $ 766,852