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Charter arrangements, Additional Information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Vessel
Counterparty
Dec. 31, 2018
USD ($)
Vessel
Counterparty
Dec. 31, 2017
Vessel
Counterparty
Charter arrangements [Abstract]      
Deferred shipping revenues | $ $ 930 $ 0  
Concentration of Risk [Abstract]      
Number of vessels 27 27 26
Number of counterparties | Counterparty 4 4 4
Time Charters [Member]      
Concentration of Risk [Abstract]      
Number of vessels 5 5 6
Spot Market [Member]      
Concentration of Risk [Abstract]      
Number of vessels 22 22 20