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Note 21 - Other Liabilities - Post-employment benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Values at the beginning of the year $ 78,700    
Interest cost 20,534 $ 43,872 $ 11,517
At the end of the year 79,200 78,700  
Unfunded post-employment benefits [member]      
Statement Line Items [Line Items]      
Values at the beginning of the year 96,229 107,601  
Translation differences 2,893 (2,204)  
Current service cost 7,851 4,625  
Interest cost 5,462 6,371  
Curtailments and settlements 21 24  
Remeasurements (*) [1] 10,907 (4,501)  
Benefits paid from the plan (22,107) (13,921)  
Other 633 (1,766)  
At the end of the year 101,889 96,229 107,601
Funded post-employment benefits [member]      
Statement Line Items [Line Items]      
Values at the beginning of the year 159,612 153,974  
Translation differences 7,300 384  
Current service cost 592 162  
Interest cost 6,034 6,403  
Remeasurements (*) [2] 3,602 7,753  
Benefits paid from the plan (11,654) (9,064)  
At the end of the year 165,486 159,612 $ 153,974
Present value of funded obligations 165,486 159,612  
Fair value of plan assets (145,692) (132,913)  
Liability (*) [3] $ 19,794 $ 26,699  
[1] For 2017 a loss of $0.08 million is attributable to demographic assumptions and a loss of $10.6 million to financial assumptions. For 2016 a loss of $0.6 and a gain of $5.1 million is attributable to demographic and financial assumptions, respectively.
[2] For 2017 a gain of $0.4 million is attributable to demographic assumptions and a loss of $4.1 million to financial assumptions. For 2016 a gain of $0.9 and a loss of $8.7 million is attributable to demographic and financial assumptions, respectively.
[3] In 2017 and 2016, $3.3 million and $2.2 million corresponding to an overfunded plan were reclassified within other non-current assets, respectively.