Significant accounting policies and recent accounting pronouncements (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Change in Accounting Estimate [Line Items]
Deferred revenue	$ 6,523		$ 7,229
Increase/ (Decrease) in trade accounts receivable	8,572	$ 7,843
Increase/ (Decrease) in deferred revenue	(1,843)	(197)
Restricted cash, current	10,425	12,120	7,169
Restricted cash, non-current	11,420	$ 8,420	8,420
Cash and cash equivalents	$ 218,651		$ 257,911
Revenue recognition method	straight-line basis
Effect of Adoption of ASC 606
Change in Accounting Estimate [Line Items]
Deferred revenue	$ 3,798
Deferred expenses	2,561
Increase/ (Decrease) in trade accounts receivable	6,187
Increase/ (Decrease) in deferred revenue	(706)
Ballasting cost incurred during backhaul voyages \| Effect of Adoption of ASC 606
Change in Accounting Estimate [Line Items]
Deferred expenses	1,229
Voyage expenses \| Effect of Adoption of ASC 606
Change in Accounting Estimate [Line Items]
Deferred expenses	1,151
Charter-in hire expenses \| Effect of Adoption of ASC 606
Change in Accounting Estimate [Line Items]
Deferred expenses	$ 1,410

A description of the revenue recognition method.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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