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Property and Equipment
 12 Months Ended
Dec. 31, 2017
Property and Equipment [Abstract]  
Property and Equipment
4. Property and Equipment

Property and equipment are comprised of the following (U.S. dollars in thousands):

  
December 31,
 
  
2016
  
2017
 
       
Land 
 
$
33,158
  
$
33,667
 
Buildings 
  
266,436
   
274,632
 
Construction in progress(1) 
  
31,124
   
53,125
 
Furniture and fixtures 
  
82,194
   
95,378
 
Computers and equipment 
  
143,014
   
156,994
 
Leasehold improvements 
  
109,863
   
123,479
 
Scanners 
  
10,578
   
11,212
 
Vehicles 
  
2,090
   
2,339
 
   
678,457
   
750,826
 
Less: accumulated depreciation 
  
(233,725
)
  
(286,239
)
  
$
444,732
  
$
464,587
 

(1)
Construction in progress includes $25.8 million and $43.4 million as of December 31, 2016 and 2017, respectively, of eligible capitalized internal-use software development costs which will be reclassified to computers and equipment when placed into service.

Depreciation of property and equipment totaled $61.6 million, $60.8 million and $58.3 million for the years ended December 31, 2015, 2016 and 2017, respectively.