XML 58 R38.htm IDEA: XBRL DOCUMENT
v3.6.0.2

CAPITAL TRANSACTIONS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2016
Capital Transactions |
Schedule of stock option activity | Stock option activity for 2016, 2015, and 2014 consisted of the following (share amounts in thousands, except for per share information):
| Number of Shares |  | Weighted Average Exercise Price Per Share
Options outstanding at January 1, 2014 | 1,926 |  |  | $ | 12.54 |
Granted | 258 |  |  | 15.38 |
Forfeited or canceled | (23 | ) |  | 13.33 |
Exercised | (124 | ) |  | 6.42 |
Options outstanding at December 31, 2014 | 2,037 |  |  | 11.69 |
Granted | 335 |  |  | 14.04 |
Forfeited or canceled | (284 | ) |  | 14.07 |
Exercised | (405 | ) |  | 9.78 |
Options outstanding at December 31, 2015 | 1,683 |  |  | 12.21 |
Forfeited or canceled | (124 | ) |  | 11.95 |
Exercised | (35 | ) |  | 4.74 |
Options outstanding at December 31, 2016 | 1,524 |  |  | $ | 12.41 |
Schedule of weighted-average assumptions using Black-Scholes option-pricing model for estimating fair value of each option granted | The fair value of each option grant was estimated on the date of the grant using the Black-Scholes option-pricing model with the following weighted average assumptions for the years ended December 31, 2015 and 2014:
| 2015 |  | 2014
Weighted average grant date fair value of grants | $ | 4.79 |  |  | $ | 6.53 |
Expected life (in years) | 5.0 to 6.0 |  |  | 6.0 |
Risk-free interest rate | 1.5 to 1.8 |  |  | 1.5 |
Expected volatility | 42.6 to 52.3 |  |  | 56.7 |
Dividend yield | 2.8 to 3.6 |  |  | 2.6 |
Summary of options outstanding and exercisable | The following table summarizes information about options outstanding and exercisable at December 31, 2016 (share amounts in thousands, except per share information):
|  | Options Outstanding |  | Options Exercisable
Range of Option Prices Per Share |  | Options Outstanding |  | Weighted-Avg. Remaining Contractual Life |  | Weighted-Avg. Exercise Price Per Share |  | Options Exercisable |  | Weighted-Avg. Remaining Contractual Life |  | Weighted-Avg. Exercise Price Per Share
$2.35 to $9.99 |  | 152 |  |  | 3.3 |  | $ | 5.38 |  |  | 152 |  |  | 3.3 |  | $ | 5.38 |
$10.00 to $11.99 |  | 397 |  |  | 6.1 |  | 11.78 |  |  | 340 |  |  | 6.1 |  | 11.74 |
$12.00 to $13.99 |  | 555 |  |  | 5.7 |  | 12.87 |  |  | 463 |  |  | 5.4 |  | 12.66 |
$14.00 to $17.70 |  | 420 |  |  | 7.8 |  | 14.95 |  |  | 246 |  |  | 7.5 |  | 15.44 |
|  | 1,524 |  |  |  |  |  |  |  | 1,201 |  |  |  |  |  |
Schedule of restricted stock unit activity | Restricted stock unit activity for the period ended December 31, 2016, 2015, and 2014 is as follows: (share amounts in thousands, except per share information):
| Number of Shares |  | Weighted Average Grant Date Fair Value
Units outstanding at January 1, 2014 | 32 |  |  | $ | 12.47 |
Granted | 156 |  |  | 10.73 |
Issued | — |  |  | — |
Forfeited | (8 | ) |  | 15.37 |
Units outstanding at December 31, 2014 | 180 |  |  | 15.09 |
Granted | 679 |  |  | 12.61 |
Issued | (30 | ) |  | 13.63 |
Forfeited | (85 | ) |  | 12.84 |
Units outstanding at December 31, 2015 | 744 |  |  | 12.48 |
Granted | 281 |  |  | 9.49 |
Issued | (154 | ) |  | 13.05 |
Forfeited | (33 | ) |  | 12.20 |
Units outstanding at December 31, 2016 | 838 |  |  | 11.39 |

X
- References No definition available. + Details
Name: | natr_CapitalTransactionsDisclosureAbstract
Namespace Prefix: | natr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration