Fair value measurements - Unaudited Condensed Consolidated Statement of Operations (Table) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014
Derivative [Line Items]
Write-off of unrealized losses related to forecasted transactions which are no longer considered probable reclassified from other comprehensive income/(loss)	$ (227)	$ 0
Ineffective portion of cash flow hedges	0	0
Total Gains/(Losses) on derivative instruments, net	(688)	(819)
Interest and finance costs
Reclassification adjustments of interest rate swap loss transferred to Interest and finance costs from Other comprehensive income/(loss)	(1,491)	0
Total Gains/(Losses) recognized	(1,491)	0
Credit Agricole and HSH Nordbank Swaps \| Before hedging designation (August 31, 2014)
Derivative [Line Items]
Unrealized gains/(losses) from the Interest rate swaps agreements	0	(819)
Goldman Sachs Swaps \| After de-designation of accounting hedging relationship (April 1, 2015)
Derivative [Line Items]
Unrealized gains/(losses) from the Interest rate swaps agreements	883	0
Realized gains/(losses) from the Interest rate swaps agreements	$ (1,344)	$ 0

The aggregate net effect in earnings due to derivatives.

No definition available.

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Amount of gain (loss) included in earnings for the period from the settlement of interest rate derivatives not designated as hedging instruments.

+ References

No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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

+ References

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- Definition

The amount of net gain (loss) reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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The net gain (loss) during the reporting period due to ineffectiveness in interest rate cash flow hedges. Recognized in earnings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (d)(1)

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Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

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-Topic 815

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-Section 50

-Paragraph 4C

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The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (c)

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