The fleet utilization rate assumption used in the impairment test of long lived assets.

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The assumption for the average rate of inflation.

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Amount of the effect of a change in accounting estimate on basic and diluted earnings per share.

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Amount of the effect of a change in accounting estimate on net income.

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The estimated vessels' salvage value per lightweight ton.

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Fair value portion of assets classified as held for sale.

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Describes the specific accounting estimate that was revised, including the nature of and justification for the revision.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Description of the methodology for computing depreciation for classes of depreciable assets.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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The number of units (items of property) under operating lease arrangements.

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Significant accounting policies and recent accounting pronouncements (Details)	12 Months Ended
	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