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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Stock Based Compensation [Abstract]  
Stock Option Valuation Assumptions
The fair value of stock option awards was estimated using the Black-Scholes option-pricing model with the following assumptions and weighted-average fair values as follows:

 
December 31,
 
Stock Options:
2013
 
2014
 
2015
 
    
Weighted average grant date fair value of grants
$ 
 
22.10
 $ 
 
23.01
 $ 
 
16.26
 
Risk-free interest rate(1)                                                                                  
  
1.4%
 
  
1.7%
 
  
1.7%
 
Dividend yield(2)                                                                                  
  
3.1%
 
  
1.9%
 
  
2.1%
 
Expected volatility(3)                                                                                  
  
41.7%
 
  
45.4%
 
  
46.8%
 
Expected life in months(4)                                                                                  
62 months
 
62 months
 
65 months
 
 
(1)The risk-free interest rate is based upon the rate on a zero coupon U.S. Treasury bill, for periods within the contractual life of the option, in effect at the time of the grant.

(2)The dividend yield is based on the average of historical stock prices and actual dividends paid.

(3)Expected volatility is based on the historical volatility of the Company's stock price, over a period similar to the expected life of the option.

(4)The expected term of the option is based on the historical employee exercise behavior, the vesting terms of the respective option, and a contractual life of either seven or ten years.
Stock Options
 
 
 
 
NU SKIN ENTERPRISES, INC.
Notes to Consolidated Financial Statements
 
Options under the plans as of December 31, 2015 and changes during the year ended December 31, 2015 were as follows:

  
Shares
(in thousands)
  
Weighted-average Exercise Price
  
Weighted- average Remaining Contractual Term
(in years)
  
Aggregate Intrinsic Value
(in thousands)
 
         
Options activity – service based
        
Outstanding at December 31, 2014                                                                                      
  
1,924.2
  
$
29.08
     
Granted                                                                                      
  
179.7
   
42.51
     
Exercised                                                                                      
  
(545.0
)
  
18.14
     
Forfeited/cancelled/expired                                                                                      
  
(89.2
)
  
60.99
     
Outstanding at December 31, 2015                                                                                      
  
1,469.7
   
32.85
   
2.33
  
$
20,228
 
Exercisable at December 31, 2015                                                                                      
  
1,175.3
   
26.68
   
1.43
   
20,191
 
                 
Options activity – performance based
                
Outstanding at December 31, 2014                                                                                      
  
4,038.3
  
$
60.61
         
Granted                                                                                      
  
38.8
   
54.97
         
Exercised                                                                                      
  
(175.4
)
  
30.35
         
Forfeited/cancelled/expired                                                                                      
  
(303.0
)
  
71.58
         
Outstanding at December 31, 2015                                                                                      
  
3,598.7
   
61.10
   
3.64
  
$
9,177
 
Exercisable at December 31, 2015                                                                                      
  
1,286.3
   
31.31
   
1.93
   
9,177
 
                 
Options activity – all options
                
Outstanding at December 31, 2014                                                                                      
  
5,962.5
  
$
50.43
         
Granted                                                                                      
  
218.5
   
44.72
         
Exercised                                                                                      
  
(720.4
)
  
21.11
         
Forfeited/cancelled/expired                                                                                      
  
(392.2
)
  
69.17
         
Outstanding at December 31, 2015                                                                                      
  
5,068.4
   
52.91
   
3.26
  
$
29,406
 
Exercisable at December 31, 2015                                                                                      
  
2,461.6
   
29.10
   
1.70
   
29,369
 
Stock Options Exercised
Cash proceeds, tax benefits and intrinsic value related to total stock options exercised during 2013, 2014 and 2015, were as follows (U.S. dollars in thousands):

  
December 31,
 
  
2013
  
2014
  
2015
 
       
Cash proceeds from stock options exercised
 
$
37,869
  
$
11,042
  
$
13,041
 
Tax benefit realized for stock options exercised
  
41,914
   
11,947
   
4,451
 
Intrinsic value of stock options exercised
  
241,700
   
17,159
   
12,085
 
Nonvested Restricted Stock Awards
 
 
 
 
NU SKIN ENTERPRISES, INC.
Notes to Consolidated Financial Statements
 
Nonvested restricted stock awards as of December 31, 2015 and changes during the year ended December 31, 2015 were as follows:

  
Number of Shares
(in thousands)
  
Weighted-average Grant Date Fair Value
 
     
Nonvested at December 31, 2014  
  
673.8
  
$
60.14
 
         
Granted  
  
358.1
   
54.80
 
Vested  
  
(249.1
)
  
52.52
 
Forfeited
  
(120.6
)
  
56.03
 
         
Nonvested at December 31, 2015  
  
662.2
  
60.87