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Financial risk management, objectives and policies, The Nordea/DNB Newbuilding Credit Facility (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2018
USD ($)
Carrier
Jun. 30, 2017
USD ($)
Carrier
Jun. 30, 2017
USD ($)
Borrower
Jun. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Intallment
Dec. 31, 2018
USD ($)
Credit Facility [Abstract]            
Borrowing amount         $ 850,972 $ 967,275
Frequency of periodic repayment         Quarterly  
Nordea/DNB Newbuilding Credit Facility [Member]            
Credit Facility [Abstract]            
Borrowing amount $ 484,000 $ 82,500 $ 82,500      
Number of VLCCs executed a credit facility to fund the acquisition   2 2      
Term         5 years  
Frequency of periodic repayment         Quarterly  
Number of installments for repayment of borrowings | Intallment         20  
Debt repayment installment amount         $ 1,000  
Debt repayment final amount         61,900  
Credit facility covenant to maintain adjusted tangible net worth         $ 300,000  
Number of VLCCs refinanced | Carrier 13          
Noncash finance expense related to upfront fees       $ 4,300    
Nordea/DNB Newbuilding 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%  
Nordea/DNB Newbuilding Credit Facility [Member] | LIBOR [Member]            
Credit Facility [Abstract]            
Adjustment to interest rate basis   2.50% 2.50%