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Summary of Significant Accounting Policies, Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Balance (gross) | $ 1,065,939 |  |
Accumulated impairment and amortization | (627,191) |  |
Balance | 438,748 |  |
Balance (gross) |  | $ 1,065,939 |
Accumulated impairment and amortization | (627,191) | (627,191) |
Balance | 438,748 | 438,748 |
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |
Other intangible assets - gross | 184,622 | 203,242 |
Accumulated amortization | (141,695) | (151,779) |
Other intangible assets - net | 42,927 | 51,463 |
Other intangible liabilities - gross | 8,800 | 13,860 |
Accumulated amortization | (8,800) | (13,280) |
Other intangible liabilities - net | 0 | 580 |
Amortization of Intangible Assets | 8,100 | 7,600 | $ 7,800
Intangible Assets and liabilities, Estimated Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
2024 | 8,500 |  |
2025 | 8,500 |  |
2026 | 6,300 |  |
2027 | 5,000 |  |
2028 | 3,500 |  |
Thereafter | $ 11,100 |  |
Weighted average amortization period for intangible assets and liabilities | 7 years |  |
Marine Transportation Segment [Member] |  |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Balance (gross) | $ 505,784 |  |
Accumulated impairment and amortization | (237,626) |  |
Balance | 268,158 |  |
Balance (gross) |  | 505,784 |
Accumulated impairment and amortization | (237,626) | (237,626) |
Balance | 268,158 | 268,158 |
Distribution and Services Segment [Member] |  |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Balance (gross) | 560,155 |  |
Accumulated impairment and amortization | (389,565) |  |
Balance | 170,590 |  |
Balance (gross) |  | 560,155 |
Accumulated impairment and amortization | (389,565) | (389,565) |
Balance | $ 170,590 | $ 170,590 |

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