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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

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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 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 + Details
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