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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2014
Summary of Significant Accounting Policies [Abstract]  
Components of Inventories
Inventories consist of the following (U.S. dollars in thousands):

 
December 31,
 
 
2013
 
2014
 
Raw materials
 
$
117,982
  
$
101,479
 
Finished goods
  
221,687
   
237,012
 
  
$
339,669
  
$
338,491
 

Adjustments to Inventories
Adjustments to inventories consist of the following (U.S. dollars in millions):

 December 31,
  
2012
  
2013
  
2014
 
       
Beginning balance, adjustments to inventory carrying value
 
$
7.1
  
$
5.5
  
$
5.9
 
Additions
  
11.6
   
12.3
   
77.4
 
Write-offs
  
(13.2
)
  
(11.9
)
  
(27.3
)
Ending balance, adjustments to inventory carrying value
 
$
5.5
  
$
5.9
  
$
56.0
 
 
Schedule of Property and Equipment Estimated Useful Lives
Depreciation is recorded using the straight-line method over the following estimated useful lives:

Buildings
 
20 - 39 years
Furniture and fixtures
 
5 - 7 years
Computers and equipment
 
3 - 5 years
Leasehold improvements
 
Shorter of estimated useful life or lease term
Scanners
 
3 years
Vehicles
 
3 - 5 years

Reconciliation of Unrecognized Tax Benefits
A reconciliation of the beginning and ending amount of unrecognized tax benefits included in other liabilities is as follows (U.S. dollars in thousands):

  
2012
  
2013
  
2014
 
       
Gross balance at January 1
 
$
7,387
  
$
9,045
  
$
7,484
 
Increases related to current year tax positions
  
2,430
   
1,188
   
2,700
 
Settlements
  
-
   
(1,671
)
  
-
 
Decreases due to lapse of statutes of limitations
  
(854
)
  
(1,086
)
  
(4,106
)
Currency adjustments
  
82
   
8
   
(91
)
Gross balance at December 31
 
$
9,045
  
$
7,484
  
$
5,987