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OTHER NON-CURRENT LIABILTIES (Tables)
 12 Months Ended
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]  
Schedule of other non current liabilties
   
As of December 31,
  
   
2018
    
2017
    
2016
  
Tax liabilities
  
$
7,147
    
$
16,840
    
$
2,061
  
Lease incentive obligations
    
1,468
      
1,765
      
-
  
Other
    
776
    
-
      
-
  
                         
   
$
9,391
    
$
18,605
    
$
2,061