v3.22.0.1
Significant accounting policies, Effect of IBOR Reform (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financial assets [Abstract]    
Assets $ 1,233,820 $ 1,490,073
Financial liabilities [Abstract]    
Liabilities 6,396,624 $ 6,658,891
LIBOR [Member]    
Financial assets [Abstract]    
Assets 0  
Financial liabilities [Abstract]    
Liabilities 1,131,072  
Project Debt [Member] | LIBOR [Member]    
Financial liabilities [Abstract]    
Liabilities 1,068,501  
Non-derivative Items [Member] | LIBOR [Member]    
Financial liabilities [Abstract]    
Liabilities 1,068,501  
Derivatives [Member] | LIBOR [Member]    
Financial liabilities [Abstract]    
Liabilities 62,571  
Non-derivative Items [Member] | LIBOR [Member]    
Financial assets [Abstract]    
Assets 0  
Derivatives [Member] | LIBOR [Member]    
Financial assets [Abstract]    
Assets $ 0