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Cash and Cash Equivalents (Tables)
 12 Months Ended
Dec. 31, 2015
CASH AND CASH EQUIVALENTS [Abstract]  
Cash and cash equivalents
 
 
 
 
 
 
 
 
 
 
  
December 31,
 2015
 
  
December 31,
 2014
 
Cash on hand and at banks
  
$
26,332
  
  
$
79,103
  
Short-term deposits and highly liquid funds
  
 
418
  
  
 
20,392
  
Total cash and cash equivalents
 
$
26,750
  
 
$
99,495