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Gains (losses) from operating activities in the statement of income, included according to their nature (Details 5) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Depreciation and amortization expense      
Depreciation of assets not in use $ (188,157) $ (212,641) $ (232,455)
Sub total (202,264) (220,827) (240,526)
Impairment losses (reversals of impairment losses) recognized in profit (loss) for the year      
Property, plant and equipment (49) (1,390) (5,205)
Intangible assets other than goodwill 1,053 4,990 (1,164)
Goodwill (140) (3,254)  
Non-current assets and disowned groups held for sale 607    
Other expenses, by nature      
Investment plan expenses (18,367) (11,860) (14,796)
Non-metallic exploration expenses (5,537) (5,864) (5,322)
Sub total (1,526,778) (1,640,664) (1,549,594)
Total (25,995) (36,907) (53,600)
Other expenses by function [Member]      
Depreciation and amortization expense      
Depreciation of assets not in use (136) (59) (90)
Sub total (136) (59) (90)
Impairment losses (reversals of impairment losses) recognized in profit (loss) for the year      
Property, plant and equipment (49) (1,390) 0
Intangible assets other than goodwill (913) (1,736) 0
Goodwill (140) (3,254) 0
Non-current assets and disowned groups held for sale (607) 0 0
Sub total (1,709) (6,380) 0
Other expenses, by nature      
Legal expenses (9,277) (15,139) (25,176)
VAT and other unrecoverable taxes (613) (1,187) (1,295)
Fines paid (145) (965) (1,112)
Investment plan expenses (1,694) (7,555) (10,006)
Non-metallic exploration expenses (5,537) (5,864) 0
Donations not accepted as tax credit (5,026) (4,502) (5,527)
Reorganization of related businesses 0 6,000 (6,000)
Other operating expenses (1,858) (1,256) (4,394)
Sub total (24,150) (30,468) (53,510)
Total $ (25,995) $ (36,907) $ (53,600)