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Financial risk management objectives and policies - Capital management 1 (Table) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Financial risk management objectives and policies [abstract] |  |  |  |
Interest bearing loans | $ 41,660 | $ 65,778 |  |
Cash (including restricted cash) | (2,966) | (373) |  |
Net debt | 38,694 | 65,405 |  |
Equity | 43,968 | 20,760 | $ 30,535 | $ 63,319
Adjustment for the market value of vessels (charter-free) | (31,970) | (46,292) |  |
Adjusted book capitalization | 11,998 | (25,532) |  |
Adjusted book capitalization plus net debt | $ 50,692 | $ 39,873 |  |
Net debt to adjusted book capitalisation plus net debt ratio | 76.00% | 164.00% |  |

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