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Project debt, Repayment schedule (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Repayment schedule [Abstract]    
Project debt $ 5,007,533 $ 4,852,348
Remainder of 2020 [Member]    
Repayment schedule [Abstract]    
Payment of interests accrued 17,981  
Nominal repayment 181,726  
Between January and June 2021 [Member]    
Repayment schedule [Abstract]    
Project debt 96,059  
Between July and December 2021 [Member]    
Repayment schedule [Abstract]    
Project debt 170,270  
2022 [Member]    
Repayment schedule [Abstract]    
Project debt 312,098  
2023 [Member]    
Repayment schedule [Abstract]    
Project debt 335,406  
2024 [Member]    
Repayment schedule [Abstract]    
Project debt 348,898  
Subsequent Years [Member]    
Repayment schedule [Abstract]    
Project debt $ 3,545,095