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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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- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

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Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

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