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Basis of presentation for the consolidated financial statements (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Basis Of Presentation For Consolidated Financial Statement [Line Items]      
Property, plant and equipment, (net) $ 1,737,319 $ 1,569,906 $ 1,454,823
Right-of-use assets 30,024 37,164 $ 0
Other current financial liabilities 68,955 291,128  
Lease liabilities, current 5,528 7,694  
Other non-current financial liabilities 1,899,513 1,488,723  
Lease liabilities, non-current $ 25,546 30,203  
Balances originally reported [Member]      
Disclosure Of Basis Of Presentation For Consolidated Financial Statement [Line Items]      
Property, plant and equipment, (net)   1,607,070  
Right-of-use assets   0  
Other current financial liabilities   298,822  
Lease liabilities, current   0  
Other non-current financial liabilities   1,518,926  
Lease liabilities, non-current   0  
Reclassification balances [Member]      
Disclosure Of Basis Of Presentation For Consolidated Financial Statement [Line Items]      
Property, plant and equipment, (net)   (37,164)  
Right-of-use assets   37,164  
Other current financial liabilities   (7,694)  
Lease liabilities, current   7,694  
Other non-current financial liabilities   (30,203)  
Lease liabilities, non-current   30,203  
Reclassified balances [member]      
Disclosure Of Basis Of Presentation For Consolidated Financial Statement [Line Items]      
Property, plant and equipment, (net)   1,569,906  
Right-of-use assets   37,164  
Other current financial liabilities   291,128  
Lease liabilities, current   7,694  
Other non-current financial liabilities   1,488,723  
Lease liabilities, non-current   $ 30,203