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Financial and capital risk management - Protection programs for the R$ and EUR denominated debt instruments and other liabilities (Details)
$ in Thousands, R$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2019
USD ($)
Derivative financial instruments.              
Financial settlement inflows (outflows) $ (34,000) $ (324,000) $ (67,000)        
CDI vs. US$ fixed rate swap              
Derivative financial instruments.              
Notional amount | R$           R$ 2,115  
Receivable | R$       R$ 9,445      
Payable         $ 2,213   $ 558,000
Average receivable rate       100.09% 100.09%    
Average payable rate       2.09% 2.09%    
Fair value of liabilities         $ (473,000)   (38,000)
Financial settlement inflows (outflows) (129,000)            
Value at risk         42,000    
CDI vs. US$ fixed rate swap | 2021              
Derivative financial instruments.              
Fair value of liabilities         (60,000)    
CDI vs. US$ fixed rate swap | 2022              
Derivative financial instruments.              
Fair value of liabilities         (96,000)    
CDI vs. US$ fixed rate swap | 2023+              
Derivative financial instruments.              
Fair value of liabilities         (317,000)    
TJLP vs. US$ fixed rate swap              
Derivative financial instruments.              
Notional amount | R$           2,111  
Receivable | R$       R$ 1,651      
Payable         $ 460,000   601,000
Average receivable rate       1.14% 1.14%    
Average payable rate       3.05% 3.05%    
Fair value of liabilities         $ (163,000)   (77,000)
Financial settlement inflows (outflows) (44,000)            
Value at risk         9,000    
TJLP vs. US$ fixed rate swap | 2021              
Derivative financial instruments.              
Fair value of liabilities         (50,000)    
TJLP vs. US$ fixed rate swap | 2022              
Derivative financial instruments.              
Fair value of liabilities         (42,000)    
TJLP vs. US$ fixed rate swap | 2023+              
Derivative financial instruments.              
Fair value of liabilities         (71,000)    
R$ fixed rate vs. US$ fixed rate swap              
Derivative financial instruments.              
Notional amount | R$           2,173  
Receivable | R$       R$ 2,512      
Payable         $ 621,000   604,000
Average receivable rate       5.43% 5.43%    
Average payable rate       0.31% 0.31%    
Fair value of liabilities         $ (111,000)   (18,000)
Financial settlement inflows (outflows) (48,000)            
Value at risk         11,000    
R$ fixed rate vs. US$ fixed rate swap | 2021              
Derivative financial instruments.              
Fair value of liabilities         (63,000)    
R$ fixed rate vs. US$ fixed rate swap | 2022              
Derivative financial instruments.              
Fair value of assets         (51,000)    
R$ fixed rate vs. US$ fixed rate swap | 2023+              
Derivative financial instruments.              
Fair value of assets         3,000    
IPCA vs. US$ fixed rate swap              
Derivative financial instruments.              
Notional amount | R$           2,826  
Receivable | R$       R$ 2,363      
Payable         $ 622,000   759,000
Average receivable rate       5.10% 5.10%    
Average payable rate       4.02% 4.02%    
Fair value of liabilities         $ (173,000)   46,000
Financial settlement inflows (outflows) (12,000)            
Value at risk         13,000    
IPCA vs. US$ fixed rate swap | 2021              
Derivative financial instruments.              
Fair value of assets         (73,000)    
IPCA vs. US$ fixed rate swap | 2022              
Derivative financial instruments.              
Fair value of assets         (8,000)    
IPCA vs. US$ fixed rate swap | 2023+              
Derivative financial instruments.              
Fair value of liabilities         (92,000)    
IPCA vs. CDI swap              
Derivative financial instruments.              
Notional amount | R$           1,634  
Receivable | R$       R$ 694      
Payable         $ 550,000   1,350,000
Average receivable rate       6.63% 6.63%    
Average payable rate       98.76% 98.76%    
Fair value of liabilities         $ 45,000   104,000
Financial settlement inflows (outflows) 44,000            
Value at risk         1,000    
IPCA vs. CDI swap | 2021              
Derivative financial instruments.              
Fair value of liabilities         7,000    
IPCA vs. CDI swap | 2022              
Derivative financial instruments.              
Fair value of liabilities         38,000    
EUR fixed rate vs. US$ fixed rate swap              
Derivative financial instruments.              
Notional amount | R$           500  
Receivable | R$       R$ 500      
Payable         $ 613,000   613,000
Average receivable rate       3.75% 3.75%    
Average payable rate       4.29% 4.29%    
Fair value of liabilities         $ 5,000    
Fair value of assets         (1,000)   $ (35,000)
Financial settlement inflows (outflows) $ (6,000)            
EUR fixed rate vs. US$ fixed rate swap | 2021              
Derivative financial instruments.              
Fair value of liabilities         (4,000)    
EUR fixed rate vs. US$ fixed rate swap | 2022              
Derivative financial instruments.              
Fair value of liabilities         (3,000)    
EUR fixed rate vs. US$ fixed rate swap | 2023+              
Derivative financial instruments.              
Fair value of liabilities         $ 6,000    
Forward              
Derivative financial instruments.              
Payable | R$       R$ 916   R$ 121  
Average payable rate       5.96% 5.96%    
Fair value of liabilities         $ (1,000)    
Value at risk         3,000    
Forward | 2021              
Derivative financial instruments.              
Fair value of assets         $ (1,000)