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Acquisitions, 2020 (Details) |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) bbl Vessel | Jan. 03, 2020 USD ($) | Dec. 28, 2018 USD ($) TankBarge | Dec. 14, 2018 USD ($) bbl TankBarge | Nov. 30, 2018 USD ($) Towboat | Dec. 31, 2020 USD ($) Vessel | Dec. 31, 2020 USD ($) Vessel | Dec. 31, 2019 USD ($) 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 | $ 657,800,000 | $ 953,826,000 | $ 953,826,000 | $ 935,135,000
Inland Pressure Barges [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Number of maritime vessels acquired | Vessel |  |  |  |  |  | 6 | 6 |  |  |
Purchase price |  |  |  |  |  |  | $ 39,350,000 |  |  |
Inland Tank Barges [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Number of maritime vessels acquired | TankBarge |  |  | 3 | 27 |  |  |  | 9 |  |
Purchase price |  |  | $ 3,120,000 | $ 28,500,000 |  |  |  | $ 17,991,000 |  |
Tank barge barrel capacity (in barrels) | bbl |  |  |  | 306,000 |  |  |  |  |  |
Inland Towboats [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Number of maritime vessels acquired | Towboat |  |  |  |  | 1 |  |  |  |  |
Purchase price |  |  |  |  | $ 3,050,000 |  |  |  |  |
Savage Inland Marine, LLC [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition | $ 278,999,000 |  |  |  |  |  |  |  |  |
Fair values of assets acquired and liabilities assumed, net [Abstract] |  |  |  |  |  |  |  |  |  |
Accounts receivable | 0 |  |  |  |  |  |  |  |  |
Inventories | 0 |  |  |  |  |  |  |  |  |
Prepaid expenses | 1,067,000 |  |  |  |  |  |  |  |  |
Property and equipment | 210,065,000 |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets | 27,085,000 |  |  |  |  |  |  |  |  |
Goodwill | 81,635,000 |  |  |  |  |  |  |  |  |
Other intangibles | 2,300,000 |  |  |  |  |  |  |  |  |
Total assets | 322,152,000 |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities | 68,000 |  |  |  |  |  |  |  |  |
Operating lease liabilities, including current portion | 43,085,000 |  |  |  |  |  |  |  |  |
Total liabilities | 43,153,000 |  |  |  |  |  |  |  |  |
Net assets acquired | 278,999,000 |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  | $ 376,000 |  |  |  |
Savage Inland Marine, LLC [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |
Fair values of assets acquired and liabilities assumed, net [Abstract] |  |  |  |  |  |  |  |  |  |
Other intangibles | $ 2,300,000 |  |  |  |  |  |  |  |  |
Intangible assets amortization period |  |  |  |  |  |  | 10 years |  |  |
Savage Inland Marine, LLC [Member] | Inland Tank Barges [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Number of maritime vessels acquired | Vessel | 92 |  |  |  |  |  |  |  |  |
Tank barge barrel capacity (in barrels) | bbl | 2,500,000 |  |  |  |  |  |  |  |  |
Savage Inland Marine, LLC [Member] | Inland Towboats [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Number of maritime vessels acquired | Vessel | 45 |  |  |  |  |  |  |  |  |
Convoy [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition |  | $ 37,180,000 |  |  |  |  |  |  |  |
Fair values of assets acquired and liabilities assumed, net [Abstract] |  |  |  |  |  |  |  |  |  |
Accounts receivable |  | 5,677,000 |  |  |  |  |  |  |  |
Inventories |  | 11,771,000 |  |  |  |  |  |  |  |
Prepaid expenses |  | 177,000 |  |  |  |  |  |  |  |
Property and equipment |  | 415,000 |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  | 3,713,000 |  |  |  |  |  |  |  |
Goodwill |  | 10,309,000 |  |  |  |  |  |  |  |
Other intangibles |  | 17,170,000 |  |  |  |  |  |  |  |
Total assets |  | 49,232,000 |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities |  | 8,339,000 |  |  |  |  |  |  |  |
Operating lease liabilities, including current portion |  | 3,713,000 |  |  |  |  |  |  |  |
Total liabilities |  | 12,052,000 |  |  |  |  |  |  |  |
Net assets acquired |  | 37,180,000 |  |  |  |  |  |  |  |
Weighted average amortization period of intangibles |  |  |  |  |  |  | 11 years |  |  |
Convoy [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |
Fair values of assets acquired and liabilities assumed, net [Abstract] |  |  |  |  |  |  |  |  |  |
Other intangibles |  | 9,000,000 |  |  |  |  |  |  |  |
Intangible assets amortization period |  |  |  |  |  |  | 10 years |  |  |
Convoy [Member] | Distributorships [Member] |  |  |  |  |  |  |  |  |  |
Fair values of assets acquired and liabilities assumed, net [Abstract] |  |  |  |  |  |  |  |  |  |
Other intangibles |  | 8,000,000 |  |  |  |  |  |  |  |
Intangible assets amortization period |  |  |  |  |  |  | 12 years |  |  |
Convoy [Member] | Non-compete Agreements [Member] |  |  |  |  |  |  |  |  |  |
Fair values of assets acquired and liabilities assumed, net [Abstract] |  |  |  |  |  |  |  |  |  |
Other intangibles |  | $ 170,000 |  |  |  |  |  |  |  |
Intangible assets amortization period |  |  |  |  |  |  | 3 years |  |  |

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