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Advances for vessels under construction and acquisition of vessels, Newbuildings (Details) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($)
Vessels [Line Items] |  |
Impairment loss | $ 6,694 | $ 28,829
Receivable refund from the shipyards | $ 5,492 |
Two newbuilding contracts |  |
Vessels [Line Items] |  |
Number of newbuilding contracts terminated | 2 |
Impairment loss | $ 1,068 |
Five newbuilding vessels |  |
Vessels [Line Items] |  |
Number of contracts for Newbuildings acquired | 5 |
Total aggregate remaining contracted price plus agreed additional amounts | $ 193,395 |
Newbuildings periodic installments, next twelve months | 83,492 |
Newbuildings periodic installments, 2018 | 109,903 |
Other non-current assets |  |
Vessels [Line Items] |  |
Receivable refund from the shipyards | 1,604 |
Prepaid expenses and other receivables |  |
Vessels [Line Items] |  |
Receivable refund from the shipyards | $ 3,888 |

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