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Income tax and deferred taxes (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement [Line Items]      
Deferred tax assets $ 138,230 $ 139,728  
Deferred Tax Liabilities, Net (183,411) (175,361)  
Deferred tax liability (asset) (183,411) 175,361 $ (205,283)
Unrealized loss [Member]      
Statement [Line Items]      
Deferred tax assets 82,075 75,832  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (82,075) (75,832) (68,544)
Property, plant and equipment and capitalized interest [Member]      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (197,167) (196,843)  
Deferred tax liability (asset) 197,167 196,843 211,374
Facility closure provision [Member]      
Statement [Line Items]      
Deferred tax assets 7,313 4,280  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (7,313) (4,280) (3,469)
Manufacturing expenses [Member]      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (106,420) (103,760)  
Deferred tax liability (asset) 106,420 103,760 102,748
Staff severance indemnities, unemployment insurance [Member]      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (6,000) (5,679)  
Deferred tax liability (asset) 6,000 5,679 6,792
Vacation accrual [Member]      
Statement [Line Items]      
Deferred tax assets 5,591 5,155  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (5,591) (5,155) (4,887)
Inventory provision [Member]      
Statement [Line Items]      
Deferred tax assets 23,885 28,155  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (23,885) (28,155) (25,172)
Materials provision [Member]      
Statement [Line Items]      
Deferred tax assets 7,982 6,239  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (7,982) (6,239) (7,107)
Forwards [Member]      
Statement [Line Items]      
Deferred tax assets 0 2,169  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) 0 (2,169) (624)
Employee benefits [Member]      
Statement [Line Items]      
Deferred tax assets 2,689 3,309  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (2,689) (3,309) (2,317)
Research and development expenses [Member]      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (3,533) (2,216)  
Deferred tax liability (asset) 3,533 2,216 3,501
Accounts Receivable [Member]      
Statement [Line Items]      
Deferred tax assets 3,542 4,188  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (3,542) (4,188) (4,253)
Provision for legal complaints and expenses [Member]      
Statement [Line Items]      
Deferred tax assets 2,546 4,013  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (2,546) (4,013) (5,243)
Loan approval expenses [Member]      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (3,856) (2,337)  
Deferred tax liability (asset) 3,856 2,337 2,670
Junior mining companies valued based on stock price [Member]      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (1,287) (976)  
Deferred tax liability (asset) 1,287 976 2,474
Royality [Member]      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (1,357) (3,278)  
Deferred tax liability (asset) 1,357 3,278 4,084
Tax loss benefit [Member]      
Statement [Line Items]      
Deferred tax assets 2,296 1,124  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) (2,296) (1,124) (1,437)
Other deferred tax assets [Member]      
Statement [Line Items]      
Deferred tax assets 0 5,005  
Deferred Tax Liabilities, Net (2,021) 0  
Deferred tax liability (asset) 2,021 (5,005) (5,002)
Foreign items other [Member]      
Statement [Line Items]      
Deferred tax assets 311 259  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) $ (311) $ (259) $ (305)