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Commitments and Contingencies (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 USD ($) | Jul. 11, 2014 USD ($) | Dec. 31, 2014 USD ($)
Vessels [Line Items] |  |  |
Variable portion of payment to SWS owner | 6-month LIBOR rate of 0.4449% |  |
Coverage for pollution | $ 1,000,000 |  |
Due to related parties | 900 |  | $ 2,166
Heron vessels |  |  |
Vessels [Line Items] |  |  |
Loan amount |  |  | 25,311
Due to related parties | $ 50 |  | $ 1,689
Oceanbulk |  |  |
Vessels [Line Items] |  |  |
Outstanding loan receivable, convertible into 50% of equity interests |  | $ 23,680 |
Conversion ratio |  | 0.5 |

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