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Accounts payable and accrued expenses (Tables)
 12 Months Ended
Dec. 31, 2017
Accounts payable and accrued expenses (Tables) [Abstract]  
Accounts payable and accrued expenses
Accounts payable and accrued expenses consist of the following:
 
(Dollars in thousands)
  
2017
    
2016
  
Accounts payable
  
$
8,883
    
$
3,565
  
Accrued interest
    
3,026
      
2,942
  
Accrued voyage expenses
    
2,274
      
224
  
Accrued employee compensation
    
2,566
      
4,812
  
Other
    
679
      
835
  
Total accounts payable and accrued expenses
  
$
17,427
    
$
12,378