Significant accounting policies and recent accounting pronouncements (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vessels' depreciation method	straight-line basis
Vessel's useful life	25 years
Vessel salvage value per LWT	$ 300	$ 300
Fleet utilization assumption	98.00%
Inflation assumption	3.00%
Revenue recognition method	straight-line basis
Voyage revenues	$ 651,561,000	331,976,000	$ 221,987,000
Deferred revenue	10,855,000	7,229,000
Voyage expenses	121,596,000	64,682,000	65,821,000
Charter-in hire expenses	92,896,000	5,325,000	3,550,000
Increase/ (Decrease) in trade accounts receivable	22,266,000	5,949,000	1,683,000
Increase/ (Decrease) in deferred revenue	2,489,000	5,169,000	(405,000)
Increase/ (Decrease) in deferred assets	7,545,000	43,000	(3,142,000)
Net cash provided by / (used in) Operating Activities	169,009,000	82,804,000	(33,232,000)
Net cash provided by / (used in) Investing Activities	(325,327,000)	(127,101,000)	(13,425,000)
Effect of Standard Adoption \| ASC 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Voyage revenues	(667,000)
Deferred revenue	(1,812,000)	(1,137,000)
Voyage expenses	441,000
Charter-in hire expenses	612,000
Increase/ (Decrease) in trade accounts receivable	22,264,000
Increase/ (Decrease) in deferred revenue	2,489,000
Effect of Standard Adoption \| ASU 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by / (used in) Operating Activities		1,834,000	(216,000)
Net cash provided by / (used in) Investing Activities		249,000	209,000
Balances without Standard Adoption \| ASC 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Voyage revenues	652,228,000
Deferred revenue	9,043,000
Voyage expenses	122,037,000
Charter-in hire expenses	93,508,000
Balances without Standard Adoption \| ASU 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by / (used in) Operating Activities		80,970,000	(33,448,000)
Net cash provided by / (used in) Investing Activities		(126,852,000)	$ (13,216,000)
Forecast \| Effect of Standard Adoption \| ASC 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Voyage revenues	4,202,000
Voyage expenses and charter-in hire expenses	2,067,000
Voyage expenses	1,455,000
Charter-in hire expenses	612,000
Revenue contracts \| Effect of Standard Adoption \| ASC 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase/ (Decrease) in deferred assets	$ 791,000
Voyage in progress \| Effect of Standard Adoption \| ASC 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred revenue		4,579,000
Deferred expenses		$ 1,263,000

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

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The estimated vessels' salvage value per lightweight ton.

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Costs relating to the voyages performed by the vessels and may include port, canal, bunker expenses, commissions and other.

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Costs relating to the voyages performed by the vessels and rent expense incurred for leased assets.

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Revenues arising from services provided to charterers according to the terms and conditions included in charter agreements. Voyage revenues may include the amortization of above/below market acquired time charter.

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Sum of the carrying amounts as of the balance sheet date of deferred costs capitalized at the end of the reporting period that are expected to be charged against earnings within one year or the normal operating cycle, if longer.

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The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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Change during the period in carrying value for all deferred liabilities due within one year or operating cycle.

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Amount of increase (decrease) in prepaid expenses, and assets classified as other.

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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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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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