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Share capital and share premium (Table) (Details) - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure of classes of share capital [line items] |  |  |
Value of shares authorised | $ 2,200 | $ 2,200 | $ 2,200
Common Shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Value of shares authorised | $ 2,000 | 2,000 | 2,000
Number of shares authorised | 500,000,000 |  |
Par value per share | $ 0.004 |  |
Class B common shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Value of shares authorised | $ 100 | 100 | 100
Number of shares authorised | 100,000,000 |  |
Par value per share | $ 0.001 |  |
Preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Value of shares authorised | $ 100 | $ 100 | $ 100
Number of shares authorised | 100,000,000 |  |
Par value per share | $ 0.001 |  |

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