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Contingencies and Commitments (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 PotentiallyResponsibleParty Spill BargeSlip Lawsuit Plaintiff | Mar. 22, 2014 TankBarge Vessel
Collision with M/S Summer Wind [Member] |  |
Loss Contingency [Abstract] |  |
Number of vessels involved in collision | Vessel |  | 2
Number of vessels damaged in collision resulting in fuel oil discharge | TankBarge |  | 1
Number of actions filed against the Company | Lawsuit | 2 |
Number of crewmembers alleging damages | Plaintiff | 2 |
Portland Harbor Superfund Site [Member] |  |
Site Contingency [Line Items] |  |
Number of other companies also named as Potentially Responsible Parties ("PRPs") | PotentiallyResponsibleParty | 250 |
Number of spills | Spill | 4 |
SBA Shipyard Site [Member] |  |
Site Contingency [Line Items] |  |
Number of barge slips | BargeSlip | 3 |

X
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- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 + Details
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- Details
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- Details
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