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Note 2 - Cost of Sales - Components of Cost of Sales (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]        
Inventories $ 2,524,341 $ 2,368,304 $ 1,563,889 $ 1,843,467
Raw materials, energy, consumables and other 3,400,396 2,794,503 1,528,532  
Services and fees 275,130 244,035 199,210  
Labor cost 855,040 778,408 658,975  
Depreciation of property, plant and equipment 432,497 383,490 376,965  
Amortization of intangible assets 8,220 18,621 27,244  
Maintenance expenses 185,782 183,370 122,553  
Allowance for obsolescence 25,457 (12,917) 32,765  
Taxes 133,308 18,542 16,693  
Other 119,507 88,823 89,575  
5,435,337 4,496,875 3,052,512  
Less: Inventories at the end of the year (*) [1] (2,524,341) (2,368,304) (1,593,708)  
From discontinued operations (7,403) (136,587)  
$ 5,279,300 $ 3,685,057 $ 3,165,684  
[1] Inventories as of December 31, 2016 include $ 29.8 million related to discontinued operations.