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Financial risk management, objectives and policies, ABN AMRO Credit Facility (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Apr. 30, 2018
USD ($)
Carrier
Borrower
Newbuilding
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Credit Facility [Abstract]            
Borrowings         $ 449,959 $ 850,972
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    
Debt prepayment before installment term $ 42,200 $ 33,400 $ 57,800      
Frequency of periodic repayment         Quarterly  
Debt repayment installment amount       $ 8,300    
Debt repayment final amount         $ 186,100  
Credit facility covenant, required adjusted tangible net worth         $ 300,000  
ABN AMRO Credit Facility [Member] | LIBOR [Member]            
Credit Facility [Abstract]            
Adjustment to interest rate basis       2.40%    
ABN AMRO Credit Facility [Member] | Bottom of Range [Member]            
Credit Facility [Abstract]            
Credit facility covenant, required percentage of charter-free market value of vessels to borrowings         135.00%  
Credit facility covenant, required percentage of adjusted tangible net worth to total assets         25.00%  
Credit facility covenant, required unencumbered consolidated cash         $ 30,000  
Credit facility covenant, required percentage of unencumbered consolidated cash to gross interest bearing debt         6.00%