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Segment information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
Customer
Vessel
Segment
Dec. 31, 2021
USD ($)
Vessel
Customer
Dec. 31, 2020
USD ($)
Vessel
Customer
Operating Segments [Abstract]      
Number of operating segments | Segment 1    
Information About Major Customers [Abstract]      
Number of vessels in operation | Vessel 23 26 27
Shipping revenues $ 450,381 $ 295,853 $ 691,039
Number of major customers | Customer 5 5 5
Time Charters [Member]      
Information About Major Customers [Abstract]      
Number of vessels in operation | Vessel 5 7 18
Spot Market [Member]      
Information About Major Customers [Abstract]      
Number of vessels in operation | Vessel 18 19 9
Major Customer [Member]      
Information About Major Customers [Abstract]      
Shipping revenues $ 223,131 $ 157,601 $ 283,042
Percentage of aggregate revenue 50.00% 53.00% 41.00%
Customer One [Member]      
Information About Major Customers [Abstract]      
Shipping revenues $ 80,198 $ 41,418 $ 78,513
Customer Two [Member]      
Information About Major Customers [Abstract]      
Shipping revenues 68,829 35,154 57,777
Customer Three [Member]      
Information About Major Customers [Abstract]      
Shipping revenues 27,443 28,322 55,371
Customer Four [Member]      
Information About Major Customers [Abstract]      
Shipping revenues 26,873 26,392 53,711
Customer Five [Member]      
Information About Major Customers [Abstract]      
Shipping revenues $ 19,788 $ 26,315 $ 37,670