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Acquisitions, 2018 (Details) |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 28, 2018 USD ($) TankBarge | Dec. 14, 2018 USD ($) bbl TankBarge | Nov. 30, 2018 USD ($) Towboat | May 10, 2018 USD ($) TankBarge bbl | Mar. 15, 2018 USD ($) TankBarge | Feb. 14, 2018 USD ($) bbl TankBarge Towboat | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) TankBarge | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | $ 148,185,000 | $ 248,164,000 | $ 301,861,000 |
Cash paid for acquisition |  |  |  |  |  |  | 81,635,000 |  |  |
Fair values of assets acquired and liabilities assumed, net [Abstract] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 657,800,000 | 953,826,000 | $ 953,826,000 | $ 935,135,000
Inland Tank Barges [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Purchase price | $ 3,120,000 | $ 28,500,000 |  |  |  |  |  | $ 17,991,000 |  |
Number of maritime vessels acquired | TankBarge | 3 | 27 |  |  |  |  |  | 9 |  |
Tank barge barrel capacity (in barrels) | bbl |  | 306,000 |  |  |  |  |  |  |  |
Average age of property |  | 8 years |  |  |  |  | 5 years |  |  |
Inland Towboats [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  | $ 3,050,000 |  |  |  |  |  |  |
Number of maritime vessels acquired | Towboat |  |  | 1 |  |  |  |  |  |  |
Inland Pressure Tank Barges [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 10,400,000 |  |  |  |  |
Number of maritime vessels acquired | TankBarge |  |  |  |  | 2 |  |  |  |  |
Average age of property |  |  |  |  | 5 years |  |  |  |  |
Targa [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition |  |  |  | $ 69,250,000 |  |  |  |  |  |
Goodwill acquired |  |  |  | 16,116,000 |  |  |  |  |  |
Intangible assets acquired |  |  |  | $ 11,000,000 |  |  |  |  |  |
Weighted average amortization period of intangibles |  |  |  | 15 years |  |  |  |  |  |
Targa [Member] | Inland Pressure Tank Barges [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Number of maritime vessels acquired | TankBarge |  |  |  | 16 |  |  |  |  |  |
Tank barge barrel capacity (in barrels) | bbl |  |  |  | 258,000 |  |  |  |  |  |
Average age of property |  |  |  | 15 years |  |  |  |  |  |
Higman [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition |  |  |  |  |  | $ 421,922,000 |  |  |  |
Goodwill acquired |  |  |  |  |  | 4,657,000 |  |  |  |
Intangible assets acquired |  |  |  |  |  | $ 11,100,000 |  |  |  |
Weighted average amortization period of intangibles |  |  |  |  |  | 4 years 10 months 24 days |  |  |  |
Acquisition related costs |  |  |  |  |  | $ 3,464,000 |  |  |  |
Fair values of assets acquired and liabilities assumed, net [Abstract] |  |  |  |  |  |  |  |  |  |
Net assets acquired |  |  |  |  |  | 421,922,000 |  |  |  |
Cash |  |  |  |  |  | 2,313,000 |  |  |  |
Accounts receivable |  |  |  |  |  | 27,527,000 |  |  |  |
Prepaid expenses and other current assets |  |  |  |  |  | 5,323,000 |  |  |  |
Property and equipment |  |  |  |  |  | 497,951,000 |  |  |  |
Goodwill |  |  |  |  |  | 4,657,000 |  |  |  |
Other assets |  |  |  |  |  | 30,000 |  |  |  |
Total assets |  |  |  |  |  | 537,801,000 |  |  |  |
Accounts payable |  |  |  |  |  | 17,012,000 |  |  |  |
Accrued liabilities |  |  |  |  |  | 14,127,000 |  |  |  |
Deferred revenues |  |  |  |  |  | 40,524,000 |  |  |  |
Other long-term liabilities |  |  |  |  |  | 44,216,000 |  |  |  |
Total liabilities |  |  |  |  |  | $ 115,879,000 |  |  |  |
Higman [Member] | Inland Tank Barges [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Number of maritime vessels acquired | TankBarge |  |  |  |  |  | 163 |  |  |  |
Aggregate tank barge barrel capacity (in barrels) | bbl |  |  |  |  |  | 4,800,000 |  |  |  |
Average age of property |  |  |  |  |  | 7 years |  |  |  |
Higman [Member] | Inland Towboats [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Number of maritime vessels acquired | Towboat |  |  |  |  |  | 75 |  |  |  |
Average age of property |  |  |  |  |  | 8 years |  |  |  |

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