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Impairments and Other Charges (Tables)
 6 Months Ended
Jun. 30, 2020
Impairments and Other Charges [Abstract]  
Changes in Goodwill

The following table summarizes the changes in goodwill (in thousands):

 
  
Marine
Transportation
    
Distribution and
Services
    
Total
  
Balance at December 31, 2019 (gross)
  
$
424,149
    
$
549,846
    
$
973,995
  
Accumulated impairment and amortization
    
(18,574
)
    
(1,595
)
    
(20,169
)
Balance at December 31, 2019
    
405,575
      
548,251
      
953,826
  
Impairment
    
—
      
(387,970
)
    
(387,970
)
Savage acquisition
    
81,667
      
—
      
81,667
  
Convoy acquisition
    
—
      
10,309
      
10,309
  
Balance at June 30, 2020 (gross)
    
505,816
      
560,155
      
1,065,971
  
Accumulated impairment and amortization
    
(18,574
)
    
(389,565
)
    
(408,139
)
Balance at June 30, 2020
  
$
487,242
    
$
170,590
    
$
657,832