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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Summary of Significant Accounting Policies [Abstract]  
Inventories
 
NU SKIN ENTERPRISES, INC.
Notes to Consolidated Financial Statements
 
Inventories consist of the following (U.S. dollars in thousands):

 
December 31, 
 
 
2014
 
2015
 
   
Raw materials                                                                                
$ 
 
101,479
  $
114,193
 
Finished goods                                                                                
  
237,012
   
151,063
 
 $ 
 
338,491
  
$
265,256
 
Adjustments to Inventories
Adjustments to inventories consist of the following (U.S. dollars in thousands):

  
2013
  
2014
  
2015
 
       
Beginning balance, adjustments to inventory carrying value
 
$
5,461
  
$
5,934
  
$
56,034
 
Additions                                                                                                  
  
12,311
   
77,379
   
38,605
 
Write-offs                                                                                                  
  
(11,838
)
  
(27,279
)
  
(73,895
)
Ending balance, adjustments to inventory carrying value
 
$
5,934
  
$
56,034
  
$
20,744
 
 
Property and equipment
Estimated Useful Lives
Property and equipment are stated at cost less accumulated depreciation. Depreciation is recorded using the straight-line method over the following estimated useful lives:

 
Buildings
 
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

 
2013
 
2014
 
2015
 
    
Gross balance at January 1
$ 
 
9,045
 $ 
 
7,484
 $ 
 
5,987
 
Increases related to prior year tax positions
─
 
─
   
1,677
 
Increases related to current year tax positions
  
1,188
   
2,700
   
1,119
 
Settlements  
  
(1,671
)
─
 
─
 
Decreases due to lapse of statutes of limitations
  
(1,086
)
  
(4,106
)
  
(667
)
Currency adjustments  
  
8
   
(91
)
  
(344
)
Gross balance at December 31  
$ 
 
7,484
 $ 
 
5,987
 $ 
 
7,772
 
 
At December 31, 2015, the Company had $7.8 million in unrecognized tax benefits of which $0.9 million, if recognized, would affect the effective tax rate. In comparison, at December 31, 2014, the Company had $6.0 million in unrecognized tax benefits of which $1.1 million, if recognized, would affect the effective tax rate. The Company's unrecognized tax benefits relate to multiple foreign and domestic jurisdictions. Due to potential increases in unrecognized tax benefits from the multiple jurisdictions in which the Company operates, as well as the expiration of various statutes of limitation, it is reasonably possible that the Company's gross unrecognized tax benefits, net of foreign currency adjustments, may increase within the next 12 months by a range of approximately $0 to $1 million.