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Stock-Based Compensation (Tables) | 12 Months Ended
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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 |

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