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Project debt, Repayment schedule (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Repayment schedule [Abstract]    
Project debt $ 5,076,352 $ 5,091,114
Remainder of 2019 [Member]    
Repayment schedule [Abstract]    
Payment of interests accrued 64,135  
Nominal repayment 226,100  
Between January and March 2020 [Member]    
Repayment schedule [Abstract]    
Project debt 16,998  
Between April and December 2020 [Member]    
Repayment schedule [Abstract]    
Project debt 236,207  
2021 [Member]    
Repayment schedule [Abstract]    
Project debt 265,416  
2022 [Member]    
Repayment schedule [Abstract]    
Project debt 296,067  
2023 [Member]    
Repayment schedule [Abstract]    
Project debt 321,564  
Subsequent Years [Member]    
Repayment schedule [Abstract]    
Project debt $ 3,649,865