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Advances for vessels under construction and acquisition of vessels (Details) $ in Thousands | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
--- | --- | ---
Vessels [Line Items] |  |
Other current assets | $ 5,857 | $ 6,447
Newbuilding Vessels or Lease Agreements |  |
Vessels [Line Items] |  |
Number of newbuilding contracts | 3 |
Total aggregate remaining contracted price plus agreed additional amounts | $ 103,492 |
Capital Lease Obligations |  |
Vessels [Line Items] |  |
Number of newbuilding contracts | 1 |
Refund receivable from the shipyards |  |
Vessels [Line Items] |  |
Other current assets | $ 1,604 |

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