Prepaid Expenses and Other Current Assets (Tables)
 12 Months Ended
Dec. 31, 2015
PREPAID EXPENSES AND OTHER CURRENT ASSETS [Abstract]  
Prepaid expenses and other current assets
 
 
 
 
 
 
 
 
 
 
  
December 31,
 2015
 
  
December 31,
 2014
 
Prepaid voyage and operating costs
  
$
8,700
  
  
$
8,996
  
Claims receivable
  
 
11,078
  
  
 
5,186
  
Prepaid other taxes
  
 
3,664
  
  
 
5,090
  
Other
  
 
700
  
  
 
2,441
  
Total prepaid expenses and other current assets
  
$
24,142
  
  
$
21,713