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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

Refers to number of barge slips during the period.

+ References

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- Definition

Refers to the number of maritime (seagoing) vessels.

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- Definition

Number of vessels damaged in collision resulting in fuel oil discharge.

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- Definition

Number of companies also named as potentially responsible parties under comprehensive environmental response compensation and liability act.

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- Definition

Number of spills at the site to be declared as a Superfund site.

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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

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Number of plaintiffs that have filed claims pertaining to a loss contingency.

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- Definition

Number of pending claims pertaining to a loss contingency.

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-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 4
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