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Income tax and deferred taxes (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets $ 139,728 $ 128,360  
Deferred Tax Liabilities, Net (175,361) (205,283)  
Deferred tax liability (asset) (175,361) (205,283) $ 205,455
Unrealized loss [Member]      
Deferred tax assets 75,832 68,544  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (75,832) (68,544) (86,156)
Property, plant and equipment and capitalized interest [Member]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (196,843) (211,374)  
Deferred tax liability (asset) 196,843 211,374 225,124
Facility closure provision [Member]      
Deferred tax assets 4,280 3,469  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (4,280) (3,469) (1,589)
Manufacturing expenses [Member]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (103,760) (102,748)  
Deferred tax liability (asset) 103,760 102,748 110,630
Staff severance indemnities, unemployment insurance [Member]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (5,679) (6,792)  
Deferred tax liability (asset) 5,679 6,792 5,214
Vacation accrual [Member]      
Deferred tax assets 5,155 4,887  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (5,155) (4,887) (4,061)
Inventory provision [Member]      
Deferred tax assets 28,155 25,172  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (28,155) (25,172) (20,684)
Materials provision [Member]      
Deferred tax assets 6,239 7,107  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (6,239) (7,107) (7,776)
Forwards [Member]      
Deferred tax assets 2,169 624  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (2,169) (624) (10,206)
Employee benefits [Member]      
Deferred tax assets 3,309 2,317  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (3,309) (2,317) (6,783)
Research and development expenses [Member]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (2,216) (3,501)  
Deferred tax liability (asset) 2,216 3,501 4,641
Accounts Receivable [Member]      
Deferred tax assets 4,188 4,253  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (4,188) (4,253) (4,305)
Provision for legal complaints and expenses [Member]      
Deferred tax assets 4,013 5,243  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (4,013) (5,243) (7,686)
Loan approval expenses [Member]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (2,337) (2,670)  
Deferred tax liability (asset) 2,337 2,670 3,115
Junior mining companies valued based on stock price [Member]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (976) (2,474)  
Deferred tax liability (asset) 976 2,474 1,300
Royality [Member]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (3,278) (4,084)  
Deferred tax liability (asset) 3,278 4,084 6,457
Tax loss benefit [Member]      
Deferred tax assets 1,124 1,437  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (1,124) (1,437) (1,302)
Other deferred tax assets [Member]      
Deferred tax assets 5,005 5,002  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (5,005) (5,002) (266)
Foreign items other [Member]      
Deferred tax assets 259 305  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) $ (259) $ (305) $ (212)