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Current and long-term debt - $225 Million credit facility (Details)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
ABN AMRO Credit Facility [Member]      
Disclosure of detailed information about borrowings [abstract]      
Repayments of current borrowings   $ 87,700,000  
Senior Secured Term Loan Facility - $225 Million Credit Facility      
Disclosure of detailed information about borrowings [abstract]      
Loan maximum borrowing capacity $ 225,000,000.0    
Periodic borrowing payment amount     $ 5,300,000
Net debt to capitalization ratio     0.65
Consolidated tangible net worth     $ 1,400,000,000
Borrowings instrument term 5 years    
Senior Secured Term Loan Facility - $225 Million Credit Facility | ABN AMRO Credit Facility [Member]      
Disclosure of detailed information about borrowings [abstract]      
Borrowings   101,200,000 101,200,000
Number of vessels 5    
Senior Secured Term Loan Facility - $225 Million Credit Facility | ABN AMRO Credit Facility [Member] | LR2 [Member]      
Disclosure of detailed information about borrowings [abstract]      
Number of vessels 4    
Senior Secured Term Loan Facility - $225 Million Credit Facility | Consolidated Liquidity Requirement - Scenario One [Member]      
Disclosure of detailed information about borrowings [abstract]      
Covenant liquidity requirement amount   25,000,000.0 25,000,000.0
Senior Secured Term Loan Facility - $225 Million Credit Facility | Consolidated Liquidity Requirement - Scenario Two [Member]      
Disclosure of detailed information about borrowings [abstract]      
Consolidated liquidity requirement per each owned vessel   500,000 500,000
Consolidated liquidity requirement per each chartered-in vessel   $ 250,000 $ 250,000
Senior Secured Term Loan Facility - $225 Million Credit Facility | Borrowings, Financial Covenants, Period One [Member]      
Disclosure of detailed information about borrowings [abstract]      
Minimum ratio for fair value of vessels     130.00%
Senior Secured Term Loan Facility - $225 Million Credit Facility | Borrowings, Financial Covenants, Period Two [Member]      
Disclosure of detailed information about borrowings [abstract]      
Minimum ratio for fair value of vessels     140.00%