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Financial risk management, objectives and policies, Credit risk (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Vessel
Counterparty
Institution
Customer
Dec. 31, 2019
USD ($)
Vessel
Counterparty
Dec. 31, 2018
Vessel
Counterparty
Credit risk [Abstract]      
Number of vessels chartered with counterparties | Vessel 18 5 5
Number of vessels | Vessel 27 27 27
Number of counterparties | Counterparty 10 4 4
Number of vessels operated in spot market | Vessel 9 22 22
Number of financial institutions for holding cash | Institution 6    
Number of major customers | Customer 5    
Current trade receivables [1] $ 30,060 $ 107,848  
Disclosure of maximum credit exposure [Abstract]      
Cash and cash equivalents 68,641 67,356  
Accounts receivable and accrued revenues 30,060 107,848  
Maximum credit exposure 98,700 $ 175,204  
Customer One [Member]      
Credit risk [Abstract]      
Current trade receivables 9,380    
Customer Two [Member]      
Credit risk [Abstract]      
Current trade receivables 6,836    
Customer Three [Member]      
Credit risk [Abstract]      
Current trade receivables 5,962    
Customer Four [Member]      
Credit risk [Abstract]      
Current trade receivables 2,730    
Customer Five [Member]      
Credit risk [Abstract]      
Current trade receivables $ 2,454    
[1] Amortized cost.