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Interest bearing debt, ABN Amro Credit Facility (Details) - ABN Amro Credit Facility [Member]
$ in Millions
 1 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Apr. 30, 2018
VLCC
Newbuilding
Sep. 30, 2020
USD ($)
Credit Facility [Abstract]          
Number of VLCCs financed | VLCC       11  
Number of newbuildings financed | Newbuilding       2  
Adjustment to interest rate basis [1] 2.40%       2.40%
Debt prepayment before installment term $ 42.2 $ 33.4 $ 57.8    
Frequency of periodic repayment         Quarterly
Debt repayment installment amount         $ 8.3
Debt repayment final amount         186.1
Credit facility covenant, required adjusted tangible net worth 300.0       $ 300.0
LIBOR [Member]          
Credit Facility [Abstract]          
Adjustment to interest rate basis       2.40%  
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 $ 30.0       $ 30.0
Credit facility covenant, required percentage of unencumbered consolidated cash to gross interest bearing debt         6.00%
[1] $100.0 mill. undrawn as of September 30, 2020.