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Capital Transactions (Details 3) (USD $)
In Thousands, except Share data, unless otherwise specified
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0 Months Ended |
3 Months Ended |
0 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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Sep. 19, 2014
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Dec. 31, 2014
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| Stock options |
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| Share Based Compensation |
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| Outstanding options to purchase (in shares) |
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2,071,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
|
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2,037,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
|
| Exercisable (in shares) |
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1,119,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
|
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1,069,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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| Expected to vest (in shares) |
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780,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
|
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794,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
|
| Aggregate Intrinsic value, outstanding |
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$ 2,638us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
|
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$ 6,801us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
|
| Aggregate Intrinsic value, exercisable |
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2,167us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
|
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4,928us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
|
| Aggregate Intrinsic value, expected to vest |
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448us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
|
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|
1,779us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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| Share-based compensation, additional disclosures |
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| 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 |
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| Risk-free interest rate (as a percent) |
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1.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
|
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| Dividend yield (as a percent) |
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2.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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| Stock options | Minimum |
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| Weighted-average assumptions used to calculate fair value of options granted |
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| Expected life |
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5 years
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| Expected volatility (as a percent) |
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46.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
|
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| Stock options | Maximum |
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| Weighted-average assumptions used to calculate fair value of options granted |
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| Expected life |
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6 years
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| Expected volatility (as a percent) |
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52.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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| RSUs |
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| Share-based compensation, additional disclosures |
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| Share-based compensation expense |
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756us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
|
197us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
|
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| Related tax benefits |
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299us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
|
78us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
|
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| Unrecognized share-based compensation expense |
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3,942us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
|
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|
849us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
|
| Weighted-average period over which the remaining compensation expense is expected to be recognized |
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2 years 2 months 12 days
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| Minimum statutory withholding requirement paid on behalf of employees (in shares) |
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8natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsMinimumWithholdingRequirements
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
|
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| Performance-based RSUs |
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| Share-based compensation, additional disclosures |
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| Vesting period based on achieving operating income and earnings per share targets |
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1 year
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| Performance-based RSUs | Maximum |
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| Share-based compensation, additional disclosures |
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| Potential compensation expense |
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3,600natr_ShareBasedCompensationPotentialCompensationExpenseToBeRecognized
/ us-gaap_AwardTypeAxis
= natr_PerformanceBasedRestrictedStockUnitsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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| SARs |
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| Share-based compensation, additional disclosures |
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| Special one-time cash dividend paid per common share (in dollars per share) |
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$ 1.50natr_SpecialOneTimeCommonStockDividendsPerShareCashPaid
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
|
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$ 1.50natr_SpecialOneTimeCommonStockDividendsPerShareCashPaid
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
|
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| 2012 Stock Incentive Plan | RSUs |
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| Number of Shares |
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| Units outstanding at the beginning of the period (in shares) |
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180,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
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| Granted (in shares) |
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569,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
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| Issued (in shares) |
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(30,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
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| Forfeited or canceled (in shares) |
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(5,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
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| Units outstanding at the end of the period (in shares) |
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714,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
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| Weighted Average Grant Date Fair Value |
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| Units outstanding at the beginning of the period (in dollars per share) |
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$ 15.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
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| Granted (in dollars per share) |
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$ 12.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
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| Issued (in dollars per share) |
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$ 13.63us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
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| Forfeited or canceled (in dollars per share) |
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$ 12.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
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| Units outstanding at the end of the period (in dollars per share) |
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$ 12.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
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| Share-based compensation, additional disclosures |
|
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| Vesting period |
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3 years
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| Discount for lack of marketability ( as a percent) |
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17.50%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
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| 2012 Stock Incentive Plan | RSUs | Minimum |
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| Share-based compensation, additional disclosures |
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| Vesting period |
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12 months
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| 2012 Stock Incentive Plan | RSUs | Maximum |
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| Share-based compensation, additional disclosures |
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| Vesting period |
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48 months
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| 2012 Stock Incentive Plan | RSUs | Board of Directors |
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| Number of Shares |
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| Number of shares subject to restriction period |
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32,000natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedSubjectToRestrictionPeriodNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
|
|
|
32,000natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedSubjectToRestrictionPeriodNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
|
| Restriction period |
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2 years
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| 2012 Stock Incentive Plan | Performance-based RSUs |
|
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| Weighted-average assumptions used to calculate fair value of options granted |
|
|
|
|
|
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| Weighted-average grant date fair value (in dollars per share) |
|
|
$ 12.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= natr_PerformanceBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
|
|
|
| 2012 Stock Incentive Plan | Time-based RSUs |
|
|
|
|
|
|
| Weighted-average assumptions used to calculate fair value of options granted |
|
|
|
|
|
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| Weighted-average grant date fair value (in dollars per share) |
|
|
$ 13.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= natr_TimeBasedRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
|
|
|
| 2012 Stock Incentive Plan | SARs |
|
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|
|
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| Number of Shares |
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| Units outstanding at the beginning of the period (in shares) |
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|
30,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
|
|
|
| Forfeited or canceled (in shares) |
|
|
(10,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
|
|
|
| Units outstanding at the end of the period (in shares) |
|
|
20,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
|
|
|
| Weighted Average Grant Date Fair Value |
|
|
|
|
|
|
| Units outstanding at the beginning of the period (in dollars per share) |
|
|
$ 5.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
|
|
|
| Forfeited or canceled (in dollars per share) |
|
|
$ 5.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
|
|
|
| Units outstanding at the end of the period (in dollars per share) |
|
|
$ 5.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
|
|
|
| Share-based compensation, additional disclosures |
|
|
|
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| Number of shares of common stock used for determining the fair value, or strike price, of grants |
|
|
1natr_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNumberOfSharesOfCommonStockForFairValueOfGrant
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
|
|
|
| Share-based compensation expense |
|
|
3us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
|
|
|
| Related tax benefits |
|
|
1us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
|
|
|
| Unrecognized share-based compensation expense |
|
|
$ 71us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
|
|
$ 150us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= natr_IncentivePlan2012Member
|
| Weighted-average period over which the remaining compensation expense is expected to be recognized |
|
|
2 years 2 months 12 days
|
|
|
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| 2012 Stock Incentive Plan | SARs | Minimum |
|
|
|
|
|
|
| Share-based compensation, additional disclosures |
|
|
|
|
|
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| Vesting period |
|
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12 months
|
|
|
|
| 2012 Stock Incentive Plan | SARs | Maximum |
|
|
|
|
|
|
| Share-based compensation, additional disclosures |
|
|
|
|
|
|
| Vesting period |
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48 months
|
|
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