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Contingencies and Commitments, Certain Significant Risks and Uncertainties (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) Customers Distributor | Dec. 31, 2019 Customers | Dec. 31, 2018 Customers
Guaranties [Abstract] |  |  |
Issued guaranties | $ 23,180,000 |  |
Maximum [Member] |  |  |
Guaranties [Abstract] |  |  |
Guarantor obligations, expiration period | 3 years |  |
Performance Bonds [Member] |  |  |
Guaranties [Abstract] |  |  |
Issued guaranties | $ 9,594,000 |  |
Marine Transportation [Member] |  |  |
Certain Significant Risks and Uncertainties [Abstract] |  |  |
Percentage of inland revenue | 65.00% |  |
Marine Transportation [Member] | Minimum [Member] |  |  |
Certain Significant Risks and Uncertainties [Abstract] |  |  |
Range of renewal options under term contracts | 1 year |  |
Marine Transportation [Member] | Maximum [Member] |  |  |
Certain Significant Risks and Uncertainties [Abstract] |  |  |
Range of renewal options under term contracts | 3 years |  |
Marine Transportation [Member] | Customers [Member] |  |  |
Certain Significant Risks and Uncertainties [Abstract] |  |  |
Percentage of costal revenue | 85.00% |  |
Customer relationship period | 40 years |  |
Number of single customers accounting more than 10% of segment revenue | Customers | 0 | 0 | 0
Distribution and Services [Member] |  |  |
Certain Significant Risks and Uncertainties [Abstract] |  |  |
Number of off-highway top distributors | Distributor | 5 |  |
Distribution and Services [Member] | Minimum [Member] |  |  |
Certain Significant Risks and Uncertainties [Abstract] |  |  |
Services segment's relationship term | 50 years |  |
Distribution and Services [Member] | Customers [Member] |  |  |
Certain Significant Risks and Uncertainties [Abstract] |  |  |
Number of single customers accounting more than 10% of segment revenue | Customers | 0 | 0 | 0
Letters Of Credit [Member] |  |  |
Guaranties [Abstract] |  |  |
Issued guaranties | $ 13,586,000 |  |

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- Definition Term of the guarantee or each group of financial instruments used to support performance by the company and its subsidiaries in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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