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Provisions (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other provisions [line items]      
Non-current provisions $ 75,787 $ 82,397  
Current provisions 40,570 33,095  
Provisions 116,357 115,492 $ 101,584
Provisions For Pensions [Member]      
Disclosure of other provisions [line items]      
Non-current provisions 52,529 59,195  
Current provisions 197    
Provisions 52,726 59,195 60,876
Environment provision [member]      
Disclosure of other provisions [line items]      
Non-current provisions 2,880 3,121  
Current provisions 331 346  
Provisions 3,211 3,467 3,083
Provisions for litigation [member]      
Disclosure of other provisions [line items]      
Current provisions 2,399 11,732  
Provisions 2,399 11,732  
Provisions for third-party liability [Member]      
Disclosure of other provisions [line items]      
Non-current provisions 7,270 7,639  
Current provisions 7,270 7,639  
Provisions 7,270 7,639 5,835
Provisions for C02 emissions allowances [Member]      
Disclosure of other provisions [line items]      
Non-current provisions 2,859    
Current provisions 25,111 7,281  
Provisions 27,970 7,281 5,512
Other provisions [member]      
Disclosure of other provisions [line items]      
Non-current provisions 10,249 12,442  
Current provisions 12,532 13,736  
Provisions 22,781 26,178 $ 26,278
Environmental rehabilitation [member]      
Disclosure of other provisions [line items]      
Non-current provisions 2,880 3,121  
Current provisions 331 0  
Provisions for litigation - FerroPem France [member]      
Disclosure of other provisions [line items]      
Current provisions 1,775 2,339  
Other provisions, provisions for taxes [member]      
Disclosure of other provisions [line items]      
Current provisions 7,323 8,136  
Other provisions, other [member]      
Disclosure of other provisions [line items]      
Current provisions $ 15,458 $ 18,042