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Advances for vessels under construction and acquisition of vessels (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jan. 03, 2018 USD ($) | Jan. 31, 2017 | Jun. 30, 2016
Vessels [Line Items] |  |  |  |  |  |
Proceeds from cancellation of vessels under construction | $ 0 | $ 0 | $ 5,800 |  |  |
Impairment loss | 0 | 29,221 | $ 321,978 |  |  |
Other Assets Current | 5,157 | 6,447 |  |  |  |
Prepaid expenses and other receivables | $ 4,215 | $ 5,641 |  |  |  |
Two newbuilding contracts |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |
Number of newbuilding contracts terminated |  | 2 |  |  |  |
Impairment loss |  | $ 1,068 |  |  |  |
Behemoth and Bruno Marks |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |
Number of vessels delivered |  |  |  |  | 2 |
Jenmark, Star Aries and Star Taurus |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |
Number of vessels delivered |  |  |  |  |  | 3
Newbuilding Vessels or Lease Agreements |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |
Number of contracts for Newbuildings acquired | 3 |  |  |  |  |
Total aggregate remaining contracted price plus agreed additional amounts | $ 103,492 |  |  |  |  |
Star Eleni (ex HN-1342) |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |
Description of Capital leases, Term of contract | Bareboat charter for ten years |  |  |  |  |
Capital leased assets, Number of vessels | 1 |  |  |  |  |
Star Eleni (ex HN-1342) | Financed by SWS owner |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |
Vessel purchase price obligation | $ 9,000 |  |  |  |  |
Star Eleni (ex HN-1342) | Financed by CSSC | Subsequent Event |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |
Capital lease obligation recognised |  |  |  | $ 30,000 |  |
Financed through bareboat capital lease arrangements | Two newbuilding contracts |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |
Newbuildings periodic installments, next twelve months | 69,984 |  |  |  |  |
Refund receivable from the shipyards |  |  |  |  |  |
Vessels [Line Items] |  |  |  |  |  |
Other Assets Current | $ 1,604 |  |  |  |  |

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