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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Vessels [Member] |  |
Fair Value Measurements [Abstract] |  |
Fair market value of assets | $ 13,247 | $ 12,550
Nonrecurring Basis [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Fair Value Measurements [Abstract] |  |
Fair market value of assets | 220 |
Nonrecurring Basis [Member] | Vessels [Member] |  |
Fair Value Measurements [Abstract] |  |
Fair market value of assets | 13,467 |
Nonrecurring Basis [Member] | Marine Transportation Equipment [Member] |  |
Fair Value Measurements [Abstract] |  |
Fair market value of assets | $ 13,247 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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