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Revenues (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenues by major source | $ 541,159,000 | $ 771,042,000 | $ 1,185,085,000 | $ 1,515,663,000 |
Revenue recognized |  |  | 33,693,000 | 73,370,000 |
Contract assets | 0 |  | 0 |  | $ 0
Marine Transportation [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenues by major source | 380,987,000 | 404,286,000 | 784,244,000 | 772,407,000 |
Marine Transportation [Member] | Inland Transportation [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenues by major source | 303,012,000 | 310,162,000 | 621,577,000 | 593,247,000 |
Marine Transportation [Member] | Coastal Transportation [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenues by major source | 77,975,000 | 94,124,000 | 162,667,000 | 179,160,000 |
Distribution and Services [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenues by major source | 160,172,000 | 366,756,000 | 400,841,000 | 743,256,000 |
Distribution and Services [Member] | Oil and Gas [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenues by major source | 30,624,000 | 198,864,000 | 109,302,000 | 421,965,000 |
Distribution and Services [Member] | Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Revenues by major source | $ 129,548,000 | $ 167,892,000 | $ 291,539,000 | $ 321,291,000 |

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