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Fair value measurements - Consolidated Statement of Operations (Table) (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
Derivative [Line Items] |  |
Write-off of unrealized losses related to forecasted transactions which are no longer considered probable reclassified from other comprehensive income/(loss) | $ (42) | $ (227)
Total Gain/(Loss) on derivative instruments, net | (4,681) | (688)
Interest and finance costs |  |
Reclassification adjustments of interest rate swap loss transferred to Interest and finance costs from Other comprehensive income/(loss) (Note 8) | (667) | (1,491)
Total Gain/(Loss) recognized | (667) | (1,491)
Goldman Sachs Swaps | After de-designation of accounting hedging relationship (April 1, 2015) |  |
Derivative [Line Items] |  |
Unrealized gain/(loss) from the Interest rate swaps agreements | (1,930) | 883
Realized gain/(loss) from the Interest rate swaps agreements | $ (2,709) | $ (1,344)

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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=64837297&loc=SL5618551-113959 + Details
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