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Financial instruments, Interest bearing debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Jun. 30, 2021
May 31, 2021
Dec. 31, 2020
Apr. 30, 2020
Aug. 31, 2018
Nov. 30, 2014
Interest-bearing debt [Abstract]              
Remaining notional $ 530,477            
Carrying amount 522,299     $ 449,959      
Credit Agricole Credit Facility [Member]              
Interest-bearing debt [Abstract]              
Remaining notional 35,136            
Carrying amount $ 35,002     37,626      
Credit Agricole Credit Facility [Member] | LIBOR [Member]              
Interest-bearing debt [Abstract]              
Interest rate spread 2.19%            
Danish Ship Finance Credit Facility [Member]              
Interest-bearing debt [Abstract]              
Remaining notional $ 33,973            
Carrying amount $ 33,683     36,015 $ 36,400   $ 49,400
Danish Ship Finance Credit Facility [Member] | LIBOR [Member]              
Interest-bearing debt [Abstract]              
Interest rate spread 2.00%           2.00%
Nordea Credit Facility [Member]              
Interest-bearing debt [Abstract]              
Remaining notional $ 231,300            
Carrying amount 225,214   $ 316,200 109,423      
Undrawn borrowing facilities $ 78,700            
Nordea Credit Facility [Member] | LIBOR [Member]              
Interest-bearing debt [Abstract]              
Interest rate spread 1.90% 1.90%          
ABN Amro Credit Facility [Member]              
Interest-bearing debt [Abstract]              
Remaining notional $ 230,067            
Carrying amount 228,400     $ 266,895      
Undrawn borrowing facilities $ 100,000            
ABN Amro Credit Facility [Member] | LIBOR [Member]              
Interest-bearing debt [Abstract]              
Interest rate spread 2.40%            
Convertible Senior Notes due 2021 [Member]              
Interest-bearing debt [Abstract]              
Interest rate spread           4.50%