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Note 29 - Related Party Transactions - Transactions Carried Out With Related Parties (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of transactions between related parties [line items]      
Revenue, related party transactions $ 49,304 $ 100,555 $ 168,545
Purchases of goods and services, related party transactions 122,489 290,271 407,545
Amounts receivable (payable), related party transactions 55,944 63,136  
Finance lease liabilities from non-consolidated parties (2,042) (2,064)  
Finance lease liabilities from other related parties (810)  
Financial debt, related parties (2,852) (2,064)  
Associates [member]      
Disclosure of transactions between related parties [line items]      
Sales of goods to related parties 20,183 20,577 23,709
Sales of services to related parties 5,829 5,620 7,641
Purchases of goods to related parties 84,485 174,588 245,186
Purchases of services to related parties 6,979 9,404 9,556
Receivables from non-consolidated parties 78,721 78,884  
Payables to non-consolidated parties (24,914) (19,100)  
Other related parties [member]      
Disclosure of transactions between related parties [line items]      
Sales of goods to related parties 18,243 69,972 131,548
Sales of services to related parties 5,049 4,386 5,647
Purchases of goods to related parties 12,892 51,765 106,624
Purchases of services to related parties 18,133 54,514 $ 46,179
Receivables from non-consolidated parties 4,447 10,400  
Payables to non-consolidated parties $ (2,310) $ (7,048)