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Contingencies and Commitments, Certain Significant Risks and Uncertainties (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) Customers Distributor | Dec. 31, 2017 Customers | Dec. 31, 2016 Customers
Guaranties [Abstract] |  |  |
Issued guaranties | $ 20,133 |  |
Maximum [Member] |  |  |
Guaranties [Abstract] |  |  |
Guarantor obligations, expiration period | 2 years |  |
Performance Bonds [Member] |  |  |
Guaranties [Abstract] |  |  |
Issued guaranties | $ 11,954 |  |
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 | 80.00% |  |
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 |  |
Services segment's relationship term | 53 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 | $ 8,179 |  |

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