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Note 20 - Deferred Income Tax - Recovery Analysis of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Deferred tax assets to be recovered after 12 months $ (153,532) $ (144,613)
Deferred tax liabilities to be recovered after 12 months 457,970 550,657
Later than one year [member]    
Statement Line Items [Line Items]    
Deferred tax assets to be recovered after 12 months (405,416) (226,431)
Deferred tax liabilities to be recovered after 12 months $ 808,108 $ 761,039