Annual report pursuant to Section 13 and 15(d)

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

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Investments, At Equity, And Advances To 50% Or Less Owned Companies (Summary of Investments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Sep. 01, 2017
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 157,108 $ 156,886  
RF Vessel Holdings      
Schedule of Equity Method Investments [Line Items]      
Ownership of equity interest     50.00%
Golfo de Mexico      
Schedule of Equity Method Investments [Line Items]      
Ownership of equity interest     50.00%
VA&E      
Schedule of Equity Method Investments [Line Items]      
Ownership of equity interest 23.80%    
Ocean Services      
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 78,049 73,940  
Ocean Services | Trailer Bridge      
Schedule of Equity Method Investments [Line Items]      
Ownership of equity interest 55.30%    
Equity method investments $ 56,770 56,364  
Ocean Services | RF Vessel Holdings      
Schedule of Equity Method Investments [Line Items]      
Ownership of equity interest 50.00%    
Equity method investments $ 15,878 10,826  
Ocean Services | Golfo de Mexico      
Schedule of Equity Method Investments [Line Items]      
Ownership of equity interest 50.00%    
Equity method investments $ 3,485 5,272  
Ocean Services | KSM      
Schedule of Equity Method Investments [Line Items]      
Ownership of equity interest 50.00%    
Equity method investments $ 1,916 1,478  
Inland Services      
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 55,092 57,897  
Inland Services | SCFCo      
Schedule of Equity Method Investments [Line Items]      
Ownership of equity interest 50.00%    
Equity method investments $ 33,705 37,219  
Inland Services | Bunge-SCF Grain      
Schedule of Equity Method Investments [Line Items]      
Ownership of equity interest 50.00%    
Equity method investments $ 15,112 14,738  
Inland Services | SCF Bunge Marine      
Schedule of Equity Method Investments [Line Items]      
Ownership of equity interest 62.50%    
Equity method investments $ 3,990 3,144  
Inland Services | Other Inland Services      
Schedule of Equity Method Investments [Line Items]      
Ownership of equity interest 50.00%    
Equity method investments $ 2,285 2,796  
Witt O'Brien's LLC | O’Brien’s do Brazil      
Schedule of Equity Method Investments [Line Items]      
Ownership of equity interest 50.00%    
Equity method investments $ 1,274 472  
Other      
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 22,693 24,577  
Other | VA&E      
Schedule of Equity Method Investments [Line Items]      
Ownership of equity interest 23.80%    
Equity method investments $ 10,448 13,073  
Other | Avion      
Schedule of Equity Method Investments [Line Items]      
Ownership of equity interest 39.10%    
Equity method investments $ 10,706 10,290  
Other | Other      
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 1,539 $ 1,214  
Other | Other | Minimum      
Schedule of Equity Method Investments [Line Items]      
Ownership of equity interest 40.00%    
Other | Other | Maximum      
Schedule of Equity Method Investments [Line Items]      
Ownership of equity interest 47.50%