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Segment information (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) Segment Vessel | Dec. 31, 2019 USD ($) Vessel | Dec. 31, 2018 USD ($) Vessel
Operating Segments [Abstract] |  |  |
Number of operating segments | Segment | 1 |  |
Information About Major Customers [Abstract] |  |  |
Number of vessels in operation | Vessel | 27 | 27 | 27
Revenues | $ 691,039 | $ 535,068 | $ 375,941
Time Charters [Member] |  |  |
Information About Major Customers [Abstract] |  |  |
Number of vessels in operation | Vessel | 18 | 5 | 5
Spot Market [Member] |  |  |
Information About Major Customers [Abstract] |  |  |
Number of vessels in operation | Vessel | 9 | 22 | 22
Customer One [Member] |  |  |
Information About Major Customers [Abstract] |  |  |
Revenues | $ 78,513 | $ 84,067 | $ 76,015
Customer Two [Member] |  |  |
Information About Major Customers [Abstract] |  |  |
Revenues | 57,777 | 79,161 | 38,408
Customer Three [Member] |  |  |
Information About Major Customers [Abstract] |  |  |
Revenues | 55,371 | 73,629 | 19,269
Customer Four [Member] |  |  |
Information About Major Customers [Abstract] |  |  |
Revenues | 53,711 | 39,477 | 18,692
Customer Five [Member] |  |  |
Information About Major Customers [Abstract] |  |  |
Revenues | $ 37,670 | $ 34,786 | $ 18,679

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