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PROPERTY AND EQUIPMENT, NET (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Schedule of Property and Equipment, Net
Property and equipment, net consists of the following:
 
   
US dollars
  
   
December 31,
  
(in thousands)
  
2017
    
2016
  
Cost :
            
Operating equipment (*)
    
52,096
      
48,598
  
Office furniture, equipment and computers
    
33,913
      
26,992
  
Land
    
1,022
      
1,022
  
Buildings
    
2,205
      
1,888
  
Vehicles
    
6,799
      
4,924
  
Leasehold improvements
    
5,780
      
4,176
  
     
101,815
      
87,600
  
Less – accumulated depreciation and amortization (**)
    
(62,768
)
    
(51,956
)
Total property and equipment, net
    
39,047
      
35,644
  
 
(*)
As December 31, 2017 and 2016, an amount of US$  30.4million and US$ 28.6 million is subject to operating lease transactions, respectively.
 
(**)
As at December 31, 2017 and 2016, an amount of US$ 15.9 million and US$ 12.5 million is subject to operating lease transactions, respectively.