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Financial risk management, objectives and policies, The 2018 ABN AMRO Credit Facility (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2018
USD ($)
Carrier
Borrower
Newbuilding
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Credit Facility [Abstract]      
Borrowings   $ 850,972 $ 967,275
Frequency of periodic repayment   Quarterly  
2018 ABN AMRO Credit Facility [Member]      
Credit Facility [Abstract]      
Borrowings $ 484,000    
Number of borrowers | Borrower 2    
Number of VLCCs financed | Carrier 11    
Number of newbuildings financed | Newbuilding 2    
Adjustment to interest rate basis 2.40%    
Frequency of periodic repayment   Quarterly  
Debt repayment installment amount $ 8,300    
Debt repayment final amount   $ 286,100  
Credit facility covenant to maintain adjusted tangible net worth   $ 300,000  
2018 ABN AMRO Credit Facility [Member] | Bottom of Range [Member]      
Credit Facility [Abstract]      
Covenants requiring all times charter-free market value of vessels   135.00%  
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%