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Acquisitions, 2018 (Details)
$ in Thousands
12 Months Ended
Dec. 28, 2018
USD ($)
TankBarge
Dec. 14, 2018
USD ($)
TankBarge
bbl
Nov. 30, 2018
USD ($)
Towboat
May 10, 2018
USD ($)
TankBarge
bbl
Mar. 15, 2018
USD ($)
TankBarge
Feb. 14, 2018
USD ($)
bbl
TankBarge
Towboat
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Acquisitions [Abstract]                  
Purchase price             $ 301,861 $ 177,222 $ 231,066
Assets [Abstract]                  
Cash           $ 2,313      
Accounts receivable           27,527      
Prepaid expenses and other current assets           5,323      
Property and equipment           497,951      
Goodwill           4,657 953,826 $ 935,135  
Other assets           30      
Total assets           537,801      
Liabilities [Abstract]                  
Accounts payable           17,012      
Accrued liabilities           14,127      
Deferred revenues           40,524      
Other long-term liabilities           44,216      
Total liabilities           115,879      
Net assets acquired           421,922      
Senior Notes Due March 1, 2028 [Member]                  
Acquisitions [Abstract]                  
Long term debt, face amount             $ 500,000    
Debt instrument, interest rate             4.20%    
Maturity Date             Mar. 01, 2028    
Inland Tank Barges [Member]                  
Acquisitions [Abstract]                  
Purchase price $ 3,120 $ 28,500              
Number of maritime vessels acquired | TankBarge 3 27              
Tank barge barrel capacity (in barrels) | bbl   306,000              
Average age of property   8 years              
Inland Towboats [Member]                  
Acquisitions [Abstract]                  
Purchase price     $ 3,050            
Number of maritime vessels acquired | Towboat     1            
Inland Pressure Tank Barges [Member]                  
Acquisitions [Abstract]                  
Purchase price         $ 10,400        
Number of maritime vessels acquired | TankBarge         2        
Average age of property         5 years        
Targa [Member]                  
Acquisitions [Abstract]                  
Cash paid for acquisition       $ 69,250          
Goodwill acquired       16,116          
Intangible assets acquired       $ 11,000          
Weighted average amortization period of intangibles       15 years          
Targa [Member] | Inland Pressure Tank Barges [Member]                  
Acquisitions [Abstract]                  
Number of maritime vessels acquired | TankBarge       16          
Tank barge barrel capacity (in barrels) | bbl       258,000          
Average age of property       15 years          
Higman [Member]                  
Acquisitions [Abstract]                  
Cash paid for acquisition           421,922      
Goodwill acquired           4,657      
Intangible assets acquired           $ 11,100      
Weighted average amortization period of intangibles           4 years 10 months 24 days      
Acquisition related costs           $ 3,464      
Higman [Member] | Senior Notes Due March 1, 2028 [Member]                  
Acquisitions [Abstract]                  
Long term debt, face amount           $ 500,000      
Debt instrument, interest rate           4.20%      
Maturity Date           Mar. 01, 2028      
Higman [Member] | Inland Tank Barges [Member]                  
Acquisitions [Abstract]                  
Number of maritime vessels acquired | TankBarge           163      
Aggregate tank barge barrel capacity (in barrels) | bbl           4,800,000      
Average age of property           7 years      
Higman [Member] | Inland Towboats [Member]                  
Acquisitions [Abstract]                  
Number of maritime vessels acquired | Towboat           75      
Average age of property           8 years