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Vessels and other fixed assets, net - Capital leases (Details) $ in Thousands	2 Months Ended	12 Months Ended
	Feb. 17, 2014 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 27, 2013 USD ($)
New Yangzijiang Vessels
Vessels [Line Items]
Description of Capital leases, Term of contract		Bareboat charter for eight years
Capital leased assets, Number of vessels		4
Payments to acquire equipment on lease				$ 20,680
Proceeds from Long-term Capital Lease Obligations				20,680
Vessel purchase price obligation		$ 6,000
Interest and finance costs		12,590	$ 7,477	$ 3,088
Capital leased assets, Net book value		325,301	228,679
Accumulated amortization		$ 21,264	$ 10,144
CSSC Vessels
Vessels [Line Items]
Description of Capital leases, Term of contract		Bareboat charter for ten years
Capital leased assets, Number of vessels	2
Vessel Capacity	208,000
CSSC First Vessel
Vessels [Line Items]
Vessel purchase price obligation	$ 12,960
CSSC Second Vessel
Vessels [Line Items]
Vessel purchase price obligation	11,990
Financed by SWS owner | CSSC First Vessel
Vessels [Line Items]
Unrecorded unconditional, Purchase price obligation	43,200
Financed by SWS owner | CSSC Second Vessel
Vessels [Line Items]
Unrecorded unconditional, Purchase price obligation	$ 40,000
Merger and Pappas Transaction | Five newbuilding vessels
Vessels [Line Items]
Description of Capital leases, Term of contract		ten-year bareboat charters
Capital leased assets, Number of vessels			3		5
Vessel Capacity					208,000
Merger and Pappas Transaction | Five newbuilding vessels | Minimum
Vessels [Line Items]
Vessel purchase price obligation					$ 11,990
Merger and Pappas Transaction | Five newbuilding vessels | Maximum
Vessels [Line Items]
Vessel purchase price obligation					12,946
Merger and Pappas Transaction | Financed by SWS owner | Five newbuilding vessels | Minimum
Vessels [Line Items]
Unrecorded unconditional, Purchase price obligation					39,968
Merger and Pappas Transaction | Financed by SWS owner | Five newbuilding vessels | Maximum
Vessels [Line Items]
Unrecorded unconditional, Purchase price obligation					$ 43,152

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- Definition

Purchase price payable at the end of the bareboat charter.

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The vessel's capacity in deadweight tonnage.

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

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The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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A general description of the lessee's leasing arrangements including, but not limited to, the following: a) the basis on which contingent rental payments are determined; (b) the existence and terms of renewal or purchase options and escalation clauses; (c) restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

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The amount, during the lease term, of each minimum [capital] lease payment allocated to interest expense so as to produce a constant periodic rate of interest on the remaining balance of the capital lease obligation.

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The cash outflow for payments to acquire rented equipment which is recorded as an asset.

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The cash inflow from proceeds received from lessor related to a long-term capital lease obligation.

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Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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