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Segment information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Vessel
Segment
Customer
Dec. 31, 2020
USD ($)
Vessel
Customer
Dec. 31, 2019
USD ($)
Vessel
Customer
Operating Segments [Abstract]      
Number of operating segments | Segment 1    
Information About Major Customers [Abstract]      
Number of vessels in operation | Vessel 26 27 27
Revenues $ 295,853 $ 691,039 $ 535,068
Number of major customers | Customer 5 5 5
Time Charters [Member]      
Information About Major Customers [Abstract]      
Number of vessels in operation | Vessel 7 18 5
Spot Market [Member]      
Information About Major Customers [Abstract]      
Number of vessels in operation | Vessel 19 9 22
Major Customer [Member]      
Information About Major Customers [Abstract]      
Revenues $ 157,601 $ 283,042 $ 311,120
Percentage of aggregate revenue 53.00% 41.00% 58.00%
Customer One [Member]      
Information About Major Customers [Abstract]      
Revenues $ 41,418 $ 78,513 $ 84,067
Customer Two [Member]      
Information About Major Customers [Abstract]      
Revenues 35,154 57,777 79,161
Customer Three [Member]      
Information About Major Customers [Abstract]      
Revenues 28,322 55,371 73,629
Customer Four [Member]      
Information About Major Customers [Abstract]      
Revenues 26,392 53,711 39,477
Customer Five [Member]      
Information About Major Customers [Abstract]      
Revenues $ 26,315 $ 37,670 $ 34,786