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CAPITAL TRANSACTIONS (Details 3) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Stock options |
Options Outstanding |
Options Outstanding (in shares) | 2,037us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Weighted-Avg. Remaining Contractual Life | 7 years 6 months
Weighted-Avg. Exercise Price Per Share (in dollars per share) | $ 11.69us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Options Exercisable |
Options Exercisable (in shares) | 1,069us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Weighted-Avg. Remaining Contractual Life | 6 years 9 months 18 days
Weighted-Avg. Exercise Price Per Share (in dollars per share) | $ 10.36us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Stock options | $2.35 to $9.99 |
Share-based Compensation [Line Items] |
Range of option prices per share, lower limit (in dollars per share) | $ 2.35us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeOneMember
Range of option prices per share, upper limit (in dollars per share) | $ 9.99us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeOneMember
Options Outstanding |
Options Outstanding (in shares) | 340us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeOneMember
Weighted-Avg. Remaining Contractual Life | 5 years 6 months
Weighted-Avg. Exercise Price Per Share (in dollars per share) | $ 5.33us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeOneMember
Options Exercisable |
Options Exercisable (in shares) | 340us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeOneMember
Weighted-Avg. Remaining Contractual Life | 5 years 6 months
Weighted-Avg. Exercise Price Per Share (in dollars per share) | $ 5.33us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeOneMember
Stock options | $10.00 to $13.99 |
Share-based Compensation [Line Items] |
Range of option prices per share, lower limit (in dollars per share) | $ 10.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeTwoMember
Range of option prices per share, upper limit (in dollars per share) | $ 13.99us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeTwoMember
Options Outstanding |
Options Outstanding (in shares) | 1,487us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeTwoMember
Weighted-Avg. Remaining Contractual Life | 7 years 9 months 18 days
Weighted-Avg. Exercise Price Per Share (in dollars per share) | $ 12.42us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeTwoMember
Options Exercisable |
Options Exercisable (in shares) | 642us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeTwoMember
Weighted-Avg. Remaining Contractual Life | 7 years 2 months 12 days
Weighted-Avg. Exercise Price Per Share (in dollars per share) | $ 12.17us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeTwoMember
Stock options | $14.00 to $17.70 |
Share-based Compensation [Line Items] |
Range of option prices per share, lower limit (in dollars per share) | $ 14.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeThreeMember
Range of option prices per share, upper limit (in dollars per share) | $ 17.70us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeThreeMember
Options Outstanding |
Options Outstanding (in shares) | 210us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeThreeMember
Weighted-Avg. Remaining Contractual Life | 8 years 9 months 18 days
Weighted-Avg. Exercise Price Per Share (in dollars per share) | $ 16.83us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeThreeMember
Options Exercisable |
Options Exercisable (in shares) | 87us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeThreeMember
Weighted-Avg. Remaining Contractual Life | 8 years 9 months 18 days
Weighted-Avg. Exercise Price Per Share (in dollars per share) | $ 16.73us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = natr_ExercisePriceRangeThreeMember
Performance based stock options sales | Maximum |
Share-based Compensation [Line Items] |
Potential compensation expense | $ 800natr_ShareBasedCompensationPotentialCompensationExpenseToBeRecognized / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingSalesMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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