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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, € in Millions, R$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
EUR (€)
Derivative financial instruments.                
Financial settlement inflows (outflows) $ 60,000 $ (114,000) $ (139,000) $ 159,000        
CDI vs. US$ fixed rate swap                
Derivative financial instruments.                
Receivable | R$         R$ 8,841   R$ 9,445  
Payable $ 2,072   $ 2,072     $ 2,213    
Average receivable rate 100.53%   100.53%   100.53%      
Average payable rate 2.57%   2.57%   2.57%      
Fair value of liabilities $ (368,000)   $ (368,000)     (473,000)    
Financial settlement inflows (outflows)     (30,000)          
Value at risk 43,000   43,000          
CDI vs. US$ fixed rate swap | 2021                
Derivative financial instruments.                
Fair value of liabilities (26,000)   (26,000)          
CDI vs. US$ fixed rate swap | 2022                
Derivative financial instruments.                
Fair value of liabilities (78,000)   (78,000)          
CDI vs. US$ fixed rate swap | 2023+                
Derivative financial instruments.                
Fair value of liabilities (264,000)   (264,000)          
TJLP vs. US$ fixed rate swap                
Derivative financial instruments.                
Receivable | R$         R$ 1,421   1,651  
Payable $ 390,000   $ 390,000     460,000    
Average receivable rate 1.12%   1.12%   1.12%      
Average payable rate 3.11%   3.11%   3.11%      
Fair value of liabilities $ (134,000)   $ (134,000)     (163,000)    
Financial settlement inflows (outflows)     (26,000)          
Value at risk 8,000   8,000          
TJLP vs. US$ fixed rate swap | 2021                
Derivative financial instruments.                
Fair value of liabilities (23,000)   (23,000)          
TJLP vs. US$ fixed rate swap | 2022                
Derivative financial instruments.                
Fair value of liabilities (40,000)   (40,000)          
TJLP vs. US$ fixed rate swap | 2023+                
Derivative financial instruments.                
Fair value of liabilities (71,000)   (71,000)          
R$ fixed rate vs. US$ fixed rate swap                
Derivative financial instruments.                
Receivable | R$         R$ 6,671   2,512  
Payable $ 1,265   $ 1,265     621,000    
Average receivable rate 3.58%   3.58%   3.58%      
Average payable rate (1.60%)   (1.60%)   (1.60%)      
Fair value of liabilities $ 62,000   $ 62,000     (111,000)    
Financial settlement inflows (outflows)     (85,000)          
Value at risk 26,000   26,000          
R$ fixed rate vs. US$ fixed rate swap | 2021                
Derivative financial instruments.                
Fair value of liabilities 10,000   10,000          
R$ fixed rate vs. US$ fixed rate swap | 2022                
Derivative financial instruments.                
Fair value of liabilities (26,000)   (26,000)          
R$ fixed rate vs. US$ fixed rate swap | 2023+                
Derivative financial instruments.                
Fair value of liabilities 78,000   78,000          
IPCA vs. US$ fixed rate swap                
Derivative financial instruments.                
Receivable | R$         R$ 1,617   2,363  
Payable $ 400,000   $ 400,000     622,000    
Average receivable rate 4.54%   4.54%   4.54%      
Average payable rate 3.88%   3.88%   3.88%      
Fair value of liabilities $ (90,000)   $ (90,000)     (173,000)    
Financial settlement inflows (outflows)     (65,000)          
Value at risk 9,000   9,000          
IPCA vs. US$ fixed rate swap | 2021                
Derivative financial instruments.                
Fair value of liabilities 1,000   1,000          
IPCA vs. US$ fixed rate swap | 2023+                
Derivative financial instruments.                
Fair value of liabilities $ (91,000)   $ (91,000)          
IPCA vs. CDI swap                
Derivative financial instruments.                
Receivable | R$         R$ 726   694  
Payable | R$         R$ 1,350   550  
Average receivable rate 6.63%   6.63%   6.63%      
Average payable rate 98.76%   98.76%   98.76%      
Fair value of liabilities $ 49,000   $ 49,000     45,000    
IPCA vs. CDI swap | 2021                
Derivative financial instruments.                
Fair value of liabilities 7,000   7,000          
IPCA vs. CDI swap | 2022                
Derivative financial instruments.                
Fair value of liabilities $ 42,000   42,000          
EUR fixed rate vs. US$ fixed rate swap                
Derivative financial instruments.                
Receivable | €               € 500
Payable           613,000    
Fair value of liabilities           (1,000)    
Financial settlement inflows (outflows)     $ (29,000)          
Forward                
Derivative financial instruments.                
Payable | R$         R$ 7,020   R$ 916  
Average payable rate 5.98%   5.98%   5.98%      
Fair value of liabilities $ 122,000   $ 122,000     $ (1,000)    
Financial settlement inflows (outflows)     13,000          
Value at risk 23,000   23,000          
Forward | 2021                
Derivative financial instruments.                
Fair value of liabilities 17,000   17,000          
Forward | 2022                
Derivative financial instruments.                
Fair value of liabilities 64,000   64,000          
Forward | 2023+                
Derivative financial instruments.                
Fair value of liabilities $ 41,000   $ 41,000