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Capital Transactions (Details 2) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
0 Months Ended | 3 Months Ended | |||
|---|---|---|---|---|---|
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Sep. 19, 2013
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Aug. 29, 2013
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Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
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| Stock options | |||||
| Number of shares | |||||
| Options outstanding at the beginning of the period (in shares) |
2,037us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Granted (in shares) |
310us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Forfeited or canceled (in shares) |
(49)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Exercised (in shares) |
(227)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Options outstanding at the end of the period (in shares) |
2,071us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Weighted Average Exercise Price Per Share | |||||
| Options outstanding at the beginning of the period (in dollars per share) |
$ 11.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Granted (in dollars per share) |
$ 14.27us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Forfeited or canceled (in dollars per share) |
$ 15.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Exercised (in dollars per share) |
$ 7.63us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Options outstanding at the end of the period (in dollars per share) |
$ 12.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Share-based compensation, additional disclosures | |||||
| Special one-time cash dividend paid per common share (in dollars per share) |
$ 1.50natr_SpecialOneTimeCommonStockDividendsPerShareCashPaid / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
$ 1.50natr_SpecialOneTimeCommonStockDividendsPerShareCashPaid / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Weighted-average assumptions used to calculate fair value of options granted | |||||
| Risk-free interest rate (as a percent) |
1.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Dividend yield (as a percent) |
2.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
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| Stock options | Minimum | |||||
| Weighted-average assumptions used to calculate fair value of options granted | |||||
| Expected life | 5 years | ||||
| Expected volatility (as a percent) |
46.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
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| Stock options | Maximum | |||||
| Weighted-average assumptions used to calculate fair value of options granted | |||||
| Expected life | 6 years | ||||
| Expected volatility (as a percent) |
52.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
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| Time-based stock options | |||||
| Share-based compensation, related information | |||||
| Share-based compensation expense |
$ 580us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember |
$ 897us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember |
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| Related tax benefit |
229us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember |
354us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember |
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| Unrecognized share-based compensation expense |
2,589us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember |
2,018us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember |
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| Weighted-average period over which the remaining compensation cost is expected to be recognized | 1 year 10 months 24 days | ||||
| Time-based stock options | Maximum | |||||
| Share-based compensation, additional disclosures | |||||
| Vesting period | 48 months | ||||
| Performance based stock options operating income margins | |||||
| Share-based compensation, additional disclosures | |||||
| Operating income margin, one (as a percent) |
6.00%natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOperatingMarginsOne / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingOperatingIncomeMarginsMember |
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| Operating income margin, two (as a percent) |
8.00%natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOperatingMarginsTwo / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingOperatingIncomeMarginsMember |
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| Operating income margin, three (as a percent) |
10.00%natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOperatingMarginsThree / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingOperatingIncomeMarginsMember |
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| Period of time during which operating income margins must be achieved in order to vest in performance based stock options | 12 months | ||||
| Consecutive period of time used to assess operating income margins which determine vesting | 15 months | ||||
| Performance based stock options sales and operating income margins | |||||
| Share-based compensation, additional disclosures | |||||
| Vesting period | 2 years | ||||
| Performance based stock options sales and operating income margins | Minimum | |||||
| Share-based compensation, additional disclosures | |||||
| Operating income margin, two (as a percent) |
8.00%natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOperatingMarginsTwo / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingSalesAndOperatingIncomeMarginsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
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| Performance based stock options sales | |||||
| Share-based compensation, additional disclosures | |||||
| Vesting period based on achieving annual net sales targets | 1 year | ||||
| Performance based stock options sales | Maximum | |||||
| Share-based compensation, related information | |||||
| Potential compensation expense |
$ 800natr_ShareBasedCompensationPotentialCompensationExpenseToBeRecognized / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingSalesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
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| 2012 Stock Incentive Plan | |||||
| Share Based Compensation | |||||
| Number of shares authorized under the plan |
1,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member |
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| Additional number of shares authorized under the plan |
1,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member |
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| 2012 Stock Incentive Plan | Time-based stock options | |||||
| Number of shares | |||||
| Granted (in shares) |
310us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member |
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| Weighted Average Exercise Price Per Share | |||||
| Granted (in dollars per share) |
$ 14.27us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member |
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| Share-based compensation, additional disclosures | |||||
| Expiration period | 10 years | ||||
| Weighted-average assumptions used to calculate fair value of options granted | |||||
| Weighted-average grant date fair value (in dollars per share) |
$ 4.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member |
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| 2009 Incentive Plan | Maximum | |||||
| Share Based Compensation | |||||
| Number of shares authorized under the plan |
400us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = natr_IncentivePlan2009Member / us-gaap_RangeAxis = us-gaap_MaximumMember |
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| X | ||||||||||
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- Definition
Represents the period of time during which operating income margins must be achieved in order to vest in performance based stock options. No definition available.
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| X | ||||||||||
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- Definition
Represents the consecutive period of time used to assess operating income margins which determine vesting. No definition available.
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| X | ||||||||||
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- Definition
Period which an employee's right to exercise an award is no longer contingent on satisfaction of a performance condition pertaining to achievement of annual net sales targets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
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| X | ||||||||||
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- Definition
Represents the first operating margin percentage to be achieved for the vesting of stock options. No definition available.
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- Definition
Represents the three operating margin percentage to be achieved for the vesting of stock options. No definition available.
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- Definition
Represents the second operating margin percentage to be achieved for the vesting of stock options. No definition available.
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- Details
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| X | ||||||||||
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- Definition
The period of time, from the grant date until the time at which the share-based option award expires. No definition available.
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- Definition
Represents the potential compensation expense to be recognized upon achieving specified net sales revenue metrics. No definition available.
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- Definition
Represents the amount of special one-time cash dividends paid during the period for each share of common stock outstanding. No definition available.
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| X | ||||||||||
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- Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Unrecognized cost of unvested options awarded to employees as compensation. No definition available.
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| X | ||||||||||
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- Definition
The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Number of additional shares authorized for issuance under an established share-based compensation plan. No definition available.
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| X | ||||||||||
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- Definition
The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average price of options that were either forfeited or expired. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Weighted average price at which option holders acquired shares when converting their stock options into shares. No definition available.
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| X | ||||||||||
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- Definition
Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available.
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| X | ||||||||||
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- Definition
Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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