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Contingencies and Commitments, Certain Significant Risks and Uncertainties (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 | Dec. 31, 2016 USD ($) State Customers | Dec. 31, 2015 Customers | Dec. 31, 2014 Customers
Guaranties [Abstract] |  |  |  |  |
Issued guaranties | $ 13,983 |  | $ 13,983 |  |
Guarantor obligations, expiration period |  |  | 3 years |  |
Performance Bonds [Member] |  |  |  |  |
Guaranties [Abstract] |  |  |  |  |
Issued guaranties | $ 10,184 |  | $ 10,184 |  |
Marine Transportation [Member] |  |  |  |  |
Certain Significant Risks and Uncertainties [Abstract] |  |  |  |  |
Percentage of inland revenue | 75.00% | 80.00% |  |  |
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 |  |  | 5 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
Diesel Engine Services [Member] |  |  |  |  |
Certain Significant Risks and Uncertainties [Abstract] |  |  |  |  |
Diesel engine services segment's relationship |  |  | 51 years |  |
Diesel Engine Services [Member] | Eastern States [Member] |  |  |  |  |
Certain Significant Risks and Uncertainties [Abstract] |  |  |  |  |
Segment operating as authorized distributors | State |  |  | 17 |  |
Diesel Engine Services [Member] | Western States [Member] |  |  |  |  |
Certain Significant Risks and Uncertainties [Abstract] |  |  |  |  |
Segment operating as authorized distributors | State |  |  | 9 |  |
Diesel Engine 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 | $ 3,799 |  | $ 3,799 |  |

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