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Financial instruments, Interest bearing debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Apr. 30, 2020
Dec. 31, 2019
Aug. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Apr. 30, 2017
Nov. 30, 2014
Interest-bearing debt [Abstract]                
Remaining notional $ 454,677              
Carrying amount 449,959   $ 850,972          
Credit Agricole Credit Facility [Member]                
Interest-bearing debt [Abstract]                
Remaining notional 37,839              
Carrying amount $ 37,626   55,719          
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 $ 36,400              
Carrying amount $ 36,015 $ 36,400 38,929         $ 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 $ 110,933              
Carrying amount 109,423   207,175   $ 96,000 $ 204,000 $ 300,000  
Undrawn borrowing facilities $ 70,300              
Nordea Credit Facility [Member] | LIBOR [Member]                
Interest-bearing debt [Abstract]                
Interest rate spread 2.40%       2.40%      
ABN Amro Credit Facility [Member]                
Interest-bearing debt [Abstract]                
Remaining notional $ 269,505              
Carrying amount 266,895   432,581          
Undrawn borrowing facilities $ 100,000              
ABN Amro Credit Facility [Member] | LIBOR [Member]                
Interest-bearing debt [Abstract]                
Interest rate spread 2.40%              
ABN AMRO Revolving Credit Facility [Member]                
Interest-bearing debt [Abstract]                
Remaining notional $ 0              
Carrying amount $ 0   0          
ABN AMRO Revolving Credit Facility [Member] | LIBOR [Member]                
Interest-bearing debt [Abstract]                
Interest rate spread 2.50%              
Convertible Senior Notes due 2021 [Member]                
Interest-bearing debt [Abstract]                
Interest rate spread       4.50%        
Interest rate 4.50%              
Remaining notional $ 0              
Carrying amount $ 0   $ 116,568