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Management fees (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Related Party Transaction [Line Items] |  |  |
Management fees | $ 7,604,000 | $ 8,436,000 | $ 158,000
Ship Procurement Services S.A. ("SPS") |  |  |
Related Party Transaction [Line Items] |  |  |
Management fees | 7,604,000 | 7,985,000 |
Procurement services daily fee | 295 |  |
Maryville Maritime Inc. |  |  |
Related Party Transaction [Line Items] |  |  |
Management fees | $ 0 | $ 451,000 | $ 35,000

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- Definition The daily fee per vessel for procurement services. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Professional and contract service expense includes cost reimbursements for support services related to contracted projects, outsourced management, technical and staff support. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition 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. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |