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Financial instruments, Interest bearing debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Apr. 30, 2017
Nov. 30, 2016
Nov. 30, 2014
Interest-bearing debt [Abstract]              
Remaining notional $ 866,009            
Carrying amount 850,972 $ 967,275          
Credit Agricole Credit Facility [Member]              
Interest-bearing debt [Abstract]              
Remaining notional 56,120            
Carrying amount $ 55,719 62,166          
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 $ 39,000            
Carrying amount $ 38,929 41,437         $ 49,400
Danish Ship Finance Credit Facility [Member] | LIBOR [Member]              
Interest-bearing debt [Abstract]              
Interest rate spread 2.25%           2.25%
Nordea BW VLCC Acquisition Credit Facility [Member]              
Interest-bearing debt [Abstract]              
Remaining notional $ 209,628            
Carrying amount $ 207,175 254,870 $ 96,000 $ 204,000 $ 300,000    
Nordea BW VLCC Acquisition 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 $ 436,261            
Carrying amount $ 432,581 464,826          
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            
ABN AMRO Revolving Credit Facility [Member] | LIBOR [Member]              
Interest-bearing debt [Abstract]              
Interest rate spread 2.50%         2.50%  
Convertible Senior Notes due 2019 [Member]              
Interest-bearing debt [Abstract]              
Interest rate 4.50%            
Remaining notional $ 0            
Carrying amount $ 0 32,009          
Convertible Senior Notes due 2021 [Member]              
Interest-bearing debt [Abstract]              
Interest rate 4.50%            
Remaining notional $ 125,000            
Carrying amount $ 116,568 $ 111,968