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Contingencies and Commitments (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 PotentiallyResponsibleParty Spill BargeSlip Lawsuit Plaintiff | Sep. 13, 2016 USD ($) | Mar. 22, 2014 Vessel
Collision with M/S Summer Wind [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Number of actions filed against the Company | Lawsuit | 2 |  |
Number of crewmembers alleging damages | Plaintiff | 2 |  |
Amount of civil penalty | $ |  | $ 4,900,000 |
Collision with M/S Summer Wind [Member] | Tank Barge [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Number of vessels involved in collision |  |  | 2
Number of vessels damaged in collision resulting in fuel oil discharge |  |  | 1
Collision with M/S Summer Wind [Member] | Towboat [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Number of vessels involved in collision |  |  | 1
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 |  |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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