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Financial risk management, objectives and policies, Credit risk (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Vessel
Counterparty
Institution
Customer
Dec. 31, 2018
USD ($)
Vessel
Counterparty
Dec. 31, 2017
Vessel
Counterparty
Credit risk [Abstract]      
Number of vessels chartered with counterparties | Vessel 5 5 6
Number of vessels | Vessel 27 27 26
Number of counterparties | Counterparty 4 4 4
Number of vessels operated in spot market | Vessel 22 22 20
Number of financial institutions for holding cash | Institution 5    
Number of major customers | Customer 5    
Current trade receivables [1] $ 107,848 $ 60,196  
Disclosure of maximum credit exposure [Abstract]      
Cash and cash equivalents 67,356 94,944  
Accounts receivable and accrued revenues 107,848 60,196  
Maximum credit exposure 175,204 $ 155,140  
Customer One [Member]      
Credit risk [Abstract]      
Current trade receivables 7,491    
Customer Two [Member]      
Credit risk [Abstract]      
Current trade receivables 6,840    
Customer Three [Member]      
Credit risk [Abstract]      
Current trade receivables 5,983    
Customer Four [Member]      
Credit risk [Abstract]      
Current trade receivables 5,403    
Customer Five [Member]      
Credit risk [Abstract]      
Current trade receivables $ 4,604    
[1] Amortized cost.