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Significant accounting policies and recent accounting pronouncements (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | 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 | $ 0 | 29,221,000 | $ 321,978,000 |
Assets held for sale | $ 0 | $ 0 |  |
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 | 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 |  |

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