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Project debt, Repayment schedule (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Repayment schedule [Abstract]      
Project debt $ 5,475,208 $ 5,330,467 $ 5,470,669
2018 [Member]      
Repayment schedule [Abstract]      
Interest repayment 21,612    
Nominal repayment 224,679    
2019 [Member]      
Repayment schedule [Abstract]      
Project debt 246,471    
2020 [Member]      
Repayment schedule [Abstract]      
Project debt 265,002    
2021 [Member]      
Repayment schedule [Abstract]      
Project debt 280,303    
2022 [Member]      
Repayment schedule [Abstract]      
Project debt 313,559    
Subsequent Years [Member]      
Repayment schedule [Abstract]      
Project debt $ 4,123,582