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Summary of Significant Accounting Policies, Goodwill and Other Intangibles (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 03, 2020
May 10, 2018
Feb. 14, 2018
Mar. 31, 2020
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Abstract]                
Balance (gross)       $ 973,995,000   $ 973,995,000 $ 973,995,000 $ 952,602,000
Accumulated impairment and amortization       (20,169,000)   (20,169,000) (20,169,000) (17,467,000)
Balance       953,826,000   953,826,000 953,826,000 935,135,000
Impairment       (387,970,000) $ (2,702,000) (387,970,000)   (2,702,000)
Other               620,000
Savage acquisition           81,635,000    
Balance (gross)         973,995,000 1,065,939,000 973,995,000 973,995,000
Accumulated impairment and amortization         (20,169,000) (408,139,000) (20,169,000) (20,169,000)
Balance         953,826,000 657,800,000 953,826,000 953,826,000
Other Intangibles [Abstract]                
Other intangible assets - gross           203,217,000 332,656,000  
Accumulated amortization           (134,238,000) (121,974,000)  
Other intangible assets - net           68,979,000 210,682,000  
Other intangible liabilities - gross           13,860,000 13,860,000  
Accumulated amortization           (10,960,000) (7,956,000)  
Other intangible liabilities - net           2,900,000 5,904,000  
Amortization of intangible assets           9,235,000 15,040,000 16,760,000
Intangible Assets and liabilities, Estimated Amortization Expense, Fiscal Year Maturity [Abstract]                
2021           7,749,000    
2022           7,466,000    
2023           7,947,000    
2024           8,513,000    
2025           $ 8,513,000    
Weighted average amortization period for intangible assets and liabilities           9 years    
Targa [Member]                
Goodwill [Abstract]                
Savage acquisition   $ 69,250,000            
Goodwill acquired               16,116,000
Higman [Member]                
Goodwill [Abstract]                
Savage acquisition     $ 421,922,000          
Goodwill acquired               4,657,000
Balance     $ 4,657,000          
Convoy [Member]                
Goodwill [Abstract]                
Savage acquisition $ 37,180,000              
Goodwill acquired           $ 10,309,000    
Balance $ 10,309,000              
Marine Transportation Segment [Member]                
Goodwill [Abstract]                
Balance (gross)       424,149,000   424,149,000 424,149,000 403,376,000
Accumulated impairment and amortization       (18,574,000)   (18,574,000) (18,574,000) (15,872,000)
Balance       405,575,000   405,575,000 405,575,000 387,504,000
Impairment           0   (2,702,000)
Other               0
Savage acquisition           81,635,000    
Balance (gross)         424,149,000 505,784,000 424,149,000 424,149,000
Accumulated impairment and amortization         (18,574,000) (18,574,000) (18,574,000) (18,574,000)
Balance         405,575,000 487,210,000 405,575,000 405,575,000
Marine Transportation Segment [Member] | Targa [Member]                
Goodwill [Abstract]                
Goodwill acquired               16,116,000
Marine Transportation Segment [Member] | Higman [Member]                
Goodwill [Abstract]                
Goodwill acquired               4,657,000
Marine Transportation Segment [Member] | Convoy [Member]                
Goodwill [Abstract]                
Goodwill acquired           0    
Distribution and Services Segment [Member]                
Goodwill [Abstract]                
Balance (gross)       549,846,000   549,846,000 549,846,000 549,226,000
Accumulated impairment and amortization       (1,595,000)   (1,595,000) (1,595,000) (1,595,000)
Balance       $ 548,251,000   548,251,000 548,251,000 547,631,000
Impairment           (387,970,000)   0
Other               620,000
Savage acquisition           0    
Balance (gross)         549,846,000 560,155,000 549,846,000 549,846,000
Accumulated impairment and amortization         (1,595,000) (389,565,000) (1,595,000) (1,595,000)
Balance         $ 548,251,000 170,590,000 $ 548,251,000 548,251,000
Distribution and Services Segment [Member] | Targa [Member]                
Goodwill [Abstract]                
Goodwill acquired               0
Distribution and Services Segment [Member] | Higman [Member]                
Goodwill [Abstract]                
Goodwill acquired               $ 0
Distribution and Services Segment [Member] | Convoy [Member]                
Goodwill [Abstract]                
Goodwill acquired           $ 10,309,000