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v3.22.1

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

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