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Advances for vessels under construction and acquisition of vessels (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jun. 30, 2016 | Jan. 31, 2016
Vessels [Line Items] |  |  |  |  |
Proceeds from cancellation of vessels under construction | $ 0 | $ 5,800 | $ 0 |  |
Impairment loss | 29,221 | 321,978 | $ 0 |  |
Other non-current assets | 1,604 | 0 |  |  |
Prepaid expenses and other receivables | $ 5,641 | $ 8,604 |  |  |
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 | 5 |  |  |  |
Total aggregate remaining contracted price plus agreed additional amounts | $ 187,014 |  |  |  |
Newbuildings periodic installments, next twelve months | 112,675 |  |  |  |
Newbuildings periodic installments, 2018 | 74,339 |  |  |  |
Financed through bareboat capital lease arrangements | Newbuilding Vessels or Lease Agreements |  |  |  |  |
Vessels [Line Items] |  |  |  |  |
Newbuildings periodic installments, next twelve months | 79,936 |  |  |  |
Newbuildings periodic installments, 2018 | 39,984 |  |  |  |
Refund receivable from the shipyards |  |  |  |  |
Vessels [Line Items] |  |  |  |  |
Refund receivable from the shipyards | 4,820 |  |  |  |
Other non-current assets | 1,604 |  |  |  |
Prepaid expenses and other receivables | $ 3,216 |  |  |  |

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