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v3.20.4

Contingencies and Commitments (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 16, 2019 CAD ($) | Jul. 16, 2019 USD ($) | Dec. 31, 2020 Spill BargeSlip Company | May 10, 2019 Vessel | Mar. 22, 2014 Vessel TankBarge
Loss Contingency [Abstract] |  |  |  |  |
Loss contingency, settlement charges | $ 2,900,000 | $ 2,200,000 |  |  |
Struck by LPG Tanker, the Genesis River [Member] |  |  |  |  |
Loss Contingency [Abstract] |  |  |  |  |
Number of vessels involved in collision |  |  |  | 2 |
Collision with M/S Summer Wind [Member] |  |  |  |  |
Loss Contingency [Abstract] |  |  |  |  |
Number of vessels involved in collision |  |  |  |  | 2
Number of vessels damaged in collision resulting in fuel oil discharge | TankBarge |  |  |  |  | 1
Portland Harbor Superfund Site [Member] |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |
Number of other companies also named as Potentially Responsible Parties ("PRPs") | Company |  |  | 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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- Details
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