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Contingencies and Commitments (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) Spill Company Bargeslip	May 10, 2019 Vessel	Mar. 22, 2014 Vessel Tankbarge
Loss Contingencies [Line Items]
Loss contingency, settlement charges	$ 15,300,000
Portland Harbor Superfund Site [Member]
Loss Contingencies [Line Items]
Number of other companies also named as Potentially Responsible Parties ("PRPs") | Company	250
Number of spills | Spill	4
SBA Shipyard Site [Member]
Loss Contingencies [Line Items]
Number of barge slips | Bargeslip	3
Settlement Agreement [Member]
Loss Contingencies [Line Items]
Payments for legal settlements	$ 2,102,000
Proceeds from legal settlements	$ 20,206,000
Struck by LPG Tanker, the Genesis River [Member]
Loss Contingencies [Line Items]
Number of vessels involved in collision | Vessel		2
Collision with M/S Summer Wind [Member]
Loss Contingencies [Line Items]
Number of vessels involved in collision | Vessel			2
Number of vessels damaged in collision resulting in fuel oil discharge | Tankbarge			1

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- Definition

Refers to number of barge slips during the period.

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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

Amount awarded from other party in judgment or settlement of litigation.

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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.

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- Definition

The amount of cash paid for the settlement of litigation or for other legal issues during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
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- Definition

Cash received for the settlement of litigation during the current period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (c)
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