Annual report pursuant to Section 13 and 15(d)

Nature Of Operations And Accounting Policies (Narrative) (Details)

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Nature Of Operations And Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Aug. 02, 2019
Jul. 03, 2017
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Jan. 01, 2018
Nature of Operations and Accounting Policies [Line Items]                              
Operating revenues     $ 192,761 $ 200,658 $ 197,023 $ 209,524 $ 213,838 $ 220,257 $ 216,831 $ 184,824 $ 799,966 $ 835,750 $ 650,847    
(Increase) decrease in receivables                     30,385 63,764 (2,195)    
Payments to noncontrolling interests                     107,692 29 0    
Cumulative effect of new accounting principle                           $ 25,359 $ (2,467)
Depreciation                     65,000 69,900 72,100    
Capitalized interest                     100 200 2,700    
Construction in progress, gross     $ 12,500               12,500        
Amortization expense                     $ 3,555 4,675 2,900    
Impairment of long-lived assets held-for-use                         400    
Equity method investment, other than temporary impairment                       $ 100 900    
Minimum                              
Nature of Operations and Accounting Policies [Line Items]                              
Finite-lived intangible asset, useful life                     1 year        
Maximum                              
Nature of Operations and Accounting Policies [Line Items]                              
Finite-lived intangible asset, useful life                     15 years        
Accounting Standards Update 2016-02                              
Nature of Operations and Accounting Policies [Line Items]                              
Cumulative effect of new accounting principle                           175,000  
Accounting Standards Update 2016-02 | Retained Earnings                              
Nature of Operations and Accounting Policies [Line Items]                              
Cumulative effect of new accounting principle                           15,523  
Accounting Standards Update 2016-02 | Retained Earnings | Sale Leaseback                              
Nature of Operations and Accounting Policies [Line Items]                              
Cumulative effect of new accounting principle                           $ 25,400  
Accounting Standards Update 2014-09                              
Nature of Operations and Accounting Policies [Line Items]                              
Effect of adoption of new accounting pronouncement                         $ 73,000    
Accounting Standards Update 2016-16 | Retained Earnings                              
Nature of Operations and Accounting Policies [Line Items]                              
Cumulative effect of new accounting principle                             $ (2,467)
SEA-Vista                              
Nature of Operations and Accounting Policies [Line Items]                              
Stock issued during period, shares, acquisitions 1,500,000                            
Payments to noncontrolling interests $ 107,700                            
Illinois Corn Processing LLC | Discontinued Operations, Disposed of by Sale                              
Nature of Operations and Accounting Policies [Line Items]                              
Proceeds from divestiture of businesses   $ 21,000                          
(Increase) decrease in receivables   32,800                          
Gain (loss) on disposal of discontinued operation   $ 10,900                          
Dry-Cargo Barge Operations                              
Nature of Operations and Accounting Policies [Line Items]                              
Noncontrolling interest, ownership percentage by parent     50.00%               50.00%        
Inland River Towboat Operations                              
Nature of Operations and Accounting Policies [Line Items]                              
Noncontrolling interest, ownership percentage by parent     63.00%               63.00%        
Inland Grain Terminals/Elevators                              
Nature of Operations and Accounting Policies [Line Items]                              
Noncontrolling interest, ownership percentage by parent     50.00%               50.00%        
Illinois Corn Processing LLC                              
Nature of Operations and Accounting Policies [Line Items]                              
Noncontrolling interest, ownership percentage by parent   70.00%                          
SEA-Vista | SEA-Vista                              
Nature of Operations and Accounting Policies [Line Items]                              
Noncontrolling interest, ownership percentage by noncontrolling owners 49.00%                            
U.S. Federal Government                              
Nature of Operations and Accounting Policies [Line Items]                              
Operating revenues                     $ 79,600        
U.S. Federal Government | Customer Concentration Risk                              
Nature of Operations and Accounting Policies [Line Items]                              
Percentage of operating revenues                     10.00%        
Ocean Services                              
Nature of Operations and Accounting Policies [Line Items]                              
Percentage of operating revenues                     53.00% 50.00% 54.00%    
Operating revenues                     $ 423,288 $ 414,844 $ 352,876    
Ocean Services | SEA-Vista                              
Nature of Operations and Accounting Policies [Line Items]                              
Noncontrolling interest, ownership percentage by noncontrolling owners     49.00%               49.00%        
Inland Services                              
Nature of Operations and Accounting Policies [Line Items]                              
Percentage of operating revenues                     33.00% 34.00% 38.00%    
Operating revenues                     $ 267,334 $ 285,688 $ 248,452    
Witt O'Brien's LLC                              
Nature of Operations and Accounting Policies [Line Items]                              
Percentage of operating revenues                     13.00% 16.00% 8.00%    
Operating revenues                     $ 101,663 $ 131,629 $ 49,055