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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 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 2) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77904769&loc=SL2265659-115463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 15 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84176918&loc=d3e32400-112679 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694 + Details
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