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Financial risk management, objectives and policies, The Danish Ship Finance Credit Facility (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Nov. 30, 2014
USD ($)
Carrier
Dec. 31, 2019
USD ($)
Intallment
Dec. 31, 2018
USD ($)
Credit Facility [Abstract]      
Borrowing amount   $ 850,972 $ 967,275
Frequency of periodic repayment   Quarterly  
Danish Ship Finance Credit Facility [Member]      
Credit Facility [Abstract]      
Number of VLCCs executed a credit facility to fund the acquisition | Carrier 1    
Borrowing amount $ 49,400 $ 38,929 $ 41,437
Term   5 years  
Number of installments for repaying debt | Intallment   10  
Frequency of periodic repayment   Semi annually  
Debt repayment installment amount   $ 1,300  
Debt repayment final amount   36,400  
Credit facility covenant to maintain adjusted tangible net worth   $ 300,000  
Danish Ship Finance Credit Facility [Member] | Bottom of Range [Member]      
Credit Facility [Abstract]      
Covenants requiring all times charter-free market value of vessels   130.00%  
Percentage of covenant to maintain adjusted tangible net worth to total assets for credit facility   25.00%  
Credit facility covenant to maintain encumbered cash   $ 30,000  
Percentage of covenant required unencumbered consolidated cash to gross interest-bearing debt for credit facility   6.00%  
Danish Ship Finance Credit Facility [Member] | LIBOR [Member]      
Credit Facility [Abstract]      
Adjustment to interest rate basis 2.25% 2.25%