Quarterly report pursuant to Section 13 or 15(d)

Investments, At Equity, And Advances To 50% Or Less Owned Companies (Narrative) (Details)

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Investments, At Equity, And Advances To 50% Or Less Owned Companies (Narrative) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
equipment
vessel
U.S.-flag Offshore Tug  
Schedule Of Equity Method Investments [Line Items]  
Equipment Subject to Operating Lease, Number of Units | equipment 1
Inland River Towboats  
Schedule Of Equity Method Investments [Line Items]  
Equipment Subject to Operating Lease, Number of Units | equipment 4
Trailer Bridge | U.S.-flag Offshore Tug  
Schedule Of Equity Method Investments [Line Items]  
Equipment Subject to Operating Lease, Number of Units | vessel 1
RF Vessel Holdings  
Schedule Of Equity Method Investments [Line Items]  
Partners' Capital Account, Contributions $ 2,000
RF Vessel Holdings | Foreign-flag Rail Ferries  
Schedule Of Equity Method Investments [Line Items]  
Number of equipment operated | vessel 2
Golfo de Mexico  
Schedule Of Equity Method Investments [Line Items]  
Partners' Capital Account, Contributions $ 500
Golfo de Mexico | Foreign-flag Rail Ferries  
Schedule Of Equity Method Investments [Line Items]  
Number of equipment operated | vessel 2
KSM | Foreign-flag Harbor Tugs  
Schedule Of Equity Method Investments [Line Items]  
Equipment Subject to Operating Lease, Number of Units | vessel 2
Number of equipment operated | vessel 4
KSM | Foreign-flag Ocean Liquid Tank Barge  
Schedule Of Equity Method Investments [Line Items]  
Number of equipment operated | vessel 1
KSM | Foreign-flag Specialty Vessels  
Schedule Of Equity Method Investments [Line Items]  
Number of equipment operated | vessel 2
SCF Bunge Marine | Inland River Towboats  
Schedule Of Equity Method Investments [Line Items]  
Equipment Subject to Operating Lease, Number of Units | vessel 8
Other Inland Services Equity Method Investments  
Schedule Of Equity Method Investments [Line Items]  
Proceeds from Equity Method Investment, Distribution $ 100
VA&E  
Schedule Of Equity Method Investments [Line Items]  
Payments for Advances and Loans to Affiliate 1,200
Proceeds from Collection of Advance to Affiliate 600
Time Charter | Trailer Bridge  
Schedule Of Equity Method Investments [Line Items]  
Revenue from Related Parties 2,000
Time Charter | SCF Bunge Marine  
Schedule Of Equity Method Investments [Line Items]  
Revenue from Related Parties 3,900
Bareboat Charter | KSM  
Schedule Of Equity Method Investments [Line Items]  
Revenue from Related Parties 800
Rental Income | Bunge SCF Grain  
Schedule Of Equity Method Investments [Line Items]  
Revenue from Related Parties $ 400