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Fair Value measurements - Gain Recognized (Table) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Derivative |  |
Gain on derivative instruments | $ 438 | $ 64
Freight Derivatives |  |
Derivative |  |
Gain on derivative instruments | 0 | 64
Interest rate swaps |  |
Derivative |  |
Gain on derivative instruments | 438 | 0
Interest rate swap agreement 1 |  |
Derivative |  |
Interest rate swaps outstanding notional amount | 26,840 |
Interest rate swap agreement 2 |  |
Derivative |  |
Interest rate swaps outstanding notional amount | $ 28,628 |

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