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Note 30 - Related Party Transactions - Transactions Carried Out With Related Parties (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]      
Revenue, related party transactions $ 100,555 $ 168,545 $ 142,374
Purchases of goods and services, related party transactions 290,271 407,545 314,943
Amounts receivable (payable), related party transactions 63,136 95,763  
Finance lease liabilities from non-consolidated parties (2,064)  
Financial debt, related parties (2,064)  
Associates [member]      
Statement Line Items [Line Items]      
Sales of goods to related parties 20,577 23,709 32,362
Sales of services to related parties 5,620 7,641 11,637
Purchases of goods to related parties 174,588 245,186 234,361
Purchases of services to related parties 9,404 9,556 12,077
Receivables from non-consolidated parties 78,884 122,136  
Payables to non-consolidated parties (19,100) (33,197)  
Other related parties [member]      
Statement Line Items [Line Items]      
Sales of goods to related parties 69,972 131,548 94,624
Sales of services to related parties 4,386 5,647 3,751
Purchases of goods to related parties 51,765 106,624 17,711
Purchases of services to related parties 54,514 46,179 $ 50,794
Receivables from non-consolidated parties 10,400 24,419  
Payables to non-consolidated parties $ (7,048) $ (17,595)