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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2014
Property and Equipment [Abstract]  
Components of Property and Equipment
Property and equipment are comprised of the following (U.S. dollars in thousands):

  
December 31,
 
  
2013
  
2014
 
     
Land
 
$
34,442
  
$
34,087
 
Buildings
  
156,734
   
230,934
 
Construction in progress
  
78,556
   
63,941
 
Furniture and fixtures
  
56,160
   
61,643
 
Computers and equipment
  
115,551
   
118,248
 
Leasehold improvements
  
87,635
   
110,539
 
Scanners
  
18,408
   
14,594
 
Vehicles
  
2,226
   
2,725
 
   
549,712
   
636,711
 
Less: accumulated depreciation
  
(153,670
)
  
(171,928
)
  
$
396,042
  
$
464,783