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Significant accounting policies and recent accounting pronouncements (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
Change in Accounting Estimate [Line Items]      
Provision for doubtful receivables $ 0 $ 0  
Vessels' depreciation method straight-line basis    
Vessel's useful life 25 years    
Fleet utilization assumption 98.00%    
Inflation assumption 3.00%    
Impairment loss $ 29,221,000 321,978,000 $ 0
Assets held for sale 0 0  
Unamortized deferred finance fees $ 10,496,000 $ 16,037,000  
Number of reportable segments 1    
Number of interest rate derivatives held by the Company 9 9  
Salvage Value      
Change in Accounting Estimate [Line Items]      
Change in Accounting Estimate, Description Effective as of January 1, 2015, following management's reassessment of the residual value of the Company's vessels, the Company increased the estimated scrap rate per light weight tonnage from $0.2 to $0.3. The current value of $0.3 was based on the historical average demolition prices prevailing in the market.    
Vessel salvage value per LWT $ 300 $ 300 $ 200
Effect of change in acounting estimate, decrease of charge to net income / (loss)   $ 6,337,000  
Effect of change in accounting estimate, loss on basic and diluted earnings per share | $ / shares   $ 0.16  
Supramax      
Change in Accounting Estimate [Line Items]      
Number of vessels subject to operating lease 1    
Designated as cash flow hedges      
Change in Accounting Estimate [Line Items]      
Number of interest rate derivatives held by the Company 4 4