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Fair value measurements - Consolidated Statement of Operations (Table) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]      
Write-off of unrealized losses related to forecasted transactions which are no longer considered probable reclassified from other comprehensive income/(loss) $ (1,793) $ 0 $ 0
Ineffective portion of cash flow hedges 0 0 0
Total Gains/(Losses) on derivative instruments, net (3,268) (799) 91
Interest and finance costs      
Reclassification adjustments of interest rate swap loss transferred to Interest and finance costs from Other comprehensive income/(loss) (2,416) (1,055) 0
Total Gains/(Losses) recognized (5,684) (1,854) 91
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 (799) 91
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 3,443 0 0
Realized gains/(losses) from the Interest rate swaps agreements $ (4,918) $ 0 $ 0