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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Composition of Assets, Grouped by Major Classifications

Composition of assets, grouped by major classifications, is as follows:

 

     December 31  
     2016      2015  
     $ in thousands  

Cost:

      

Machinery and equipment

      51,968        51,070  

Leasehold improvements

      51,688        45,808  

Land and buildings

      12,153        13,334  

Office furniture, equipment

      15,472        15,792  

Computer equipment

      61,257        55,872  

Vehicles

      404        398  
  

 

 

     

 

 

  
     192,942        182,274  

Less - accumulated depreciation and amortization

      130,567        123,292  
  

 

 

     

 

 

  
     62,375        58,982