Prepaid Expenses and Other Current Assets (Tables)
 12 Months Ended
Dec. 31, 2016
PREPAID EXPENSES AND OTHER CURRENT ASSETS [Abstract]  
Prepaid expenses and other current assets
 
 
 
 
 
 
 
 
 
 
  
December 31,
 2016
 
  
December 31,
 2015
 
Prepaid voyage and operating costs
  
$
8,352
  
  
$
8,700
  
Claims receivable
  
 
9,822
  
  
 
11,078
  
Prepaid other taxes
  
 
4,279
  
  
 
3,664
  
Advances for working capital purposes
 
 
4,486
 
 
 
—
 
Other
  
 
1,957
  
  
 
700
  
Total prepaid expenses and other current assets
  
$
28,896
  
  
$
24,142