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Summary of Significant Accounting Policies (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts Receivable [Abstract] |  |  |
Accruals for revenues earned included in accounts receivable | $ 91,850,000 | $ 103,996,000 |
Receivables from insurance companies to cover claims in excess included in accounts receivable | $ 83,145,000 | 72,591,000 |
Drydocking on Ocean-Going Vessels [Abstract] |  |  |
Period in which recertification of ocean going vessels occur twice | 5 years |  |
Recognized amortization of major maintenance costs | $ 30,214,000 | 23,962,000 | $ 20,760,000
Capitalized interest excluded from interest expense | $ 0 | $ 1,003,000 | $ 2,206,000
Minimum [Member] |  |  |
Drydocking on Ocean-Going Vessels [Abstract] |  |  |
Period of amortization of shipyard costs | 30 months |  |
Maximum [Member] |  |  |
Drydocking on Ocean-Going Vessels [Abstract] |  |  |
Period of amortization of shipyard costs | 60 months |  |
Marine Transportation Equipment [Member] | Minimum [Member] |  |  |
Property, Maintenance and Repairs [Abstract] |  |  |
Estimated useful lives of the individual assets | 5 years |  |
Marine Transportation Equipment [Member] | Maximum [Member] |  |  |
Property, Maintenance and Repairs [Abstract] |  |  |
Estimated useful lives of the individual assets | 40 years |  |
Buildings [Member] | Minimum [Member] |  |  |
Property, Maintenance and Repairs [Abstract] |  |  |
Estimated useful lives of the individual assets | 10 years |  |
Buildings [Member] | Maximum [Member] |  |  |
Property, Maintenance and Repairs [Abstract] |  |  |
Estimated useful lives of the individual assets | 40 years |  |
Other Equipment [Member] | Minimum [Member] |  |  |
Property, Maintenance and Repairs [Abstract] |  |  |
Estimated useful lives of the individual assets | 2 years |  |
Other Equipment [Member] | Maximum [Member] |  |  |
Property, Maintenance and Repairs [Abstract] |  |  |
Estimated useful lives of the individual assets | 10 years |  |

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- Definition Amount of interest capitalized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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