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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 9,800us-gaap_ProfitLoss | $ 17,609us-gaap_ProfitLoss | $ 25,380us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Write-off of cumulative translation adjustments | 4,135us-gaap_CumulativeTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease |  |
Impairment of Venezuela property, plant and equipment, net | 2,947us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |  |
Provision for doubtful accounts | (121)us-gaap_ProvisionForDoubtfulAccounts | 535us-gaap_ProvisionForDoubtfulAccounts | 45us-gaap_ProvisionForDoubtfulAccounts
Depreciation and amortization | 4,409us-gaap_DepreciationDepletionAndAmortization | 4,466us-gaap_DepreciationDepletionAndAmortization | 4,078us-gaap_DepreciationDepletionAndAmortization
Share-based compensation expense | 3,948us-gaap_ShareBasedCompensation | 3,389us-gaap_ShareBasedCompensation | 2,878us-gaap_ShareBasedCompensation
Tax benefit from stock option exercise | (307)us-gaap_DeferredTaxExpenseFromStockOptionsExercised | (653)us-gaap_DeferredTaxExpenseFromStockOptionsExercised | (378)us-gaap_DeferredTaxExpenseFromStockOptionsExercised
(Gain) Loss on sale of property and equipment | 132us-gaap_GainLossOnSaleOfPropertyPlantEquipment | (128)us-gaap_GainLossOnSaleOfPropertyPlantEquipment | 85us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Deferred income taxes | (3,927)natr_DeferredIncomeTaxExpenseBenefitCashFlow | 1,092natr_DeferredIncomeTaxExpenseBenefitCashFlow | 4,270natr_DeferredIncomeTaxExpenseBenefitCashFlow
Amortization of bond discount | 3us-gaap_AmortizationOfDebtDiscountPremium | 1us-gaap_AmortizationOfDebtDiscountPremium | 9us-gaap_AmortizationOfDebtDiscountPremium
Purchase of trading investment securities | (162)us-gaap_PaymentsForPurchaseOfSecuritiesOperatingActivities | (88)us-gaap_PaymentsForPurchaseOfSecuritiesOperatingActivities | (92)us-gaap_PaymentsForPurchaseOfSecuritiesOperatingActivities
Proceeds from sale of trading investment securities | 151us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities | 510us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities | 354us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities
Realized and unrealized gains on investments | (56)us-gaap_GainLossOnInvestments | (122)us-gaap_GainLossOnInvestments | (90)us-gaap_GainLossOnInvestments
Foreign exchange gains | (225)us-gaap_ForeignCurrencyTransactionGainLossUnrealized | (1,254)us-gaap_ForeignCurrencyTransactionGainLossUnrealized | (290)us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Changes in assets and liabilities: |  |  |
Accounts receivable | 3,457us-gaap_IncreaseDecreaseInAccountsReceivable | (1,358)us-gaap_IncreaseDecreaseInAccountsReceivable | 266us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories | 748us-gaap_IncreaseDecreaseInInventories | 838us-gaap_IncreaseDecreaseInInventories | (1,466)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other | 3,411us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (5,728)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (1,155)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other assets | (1,235)us-gaap_IncreaseDecreaseInOtherOperatingAssets | (303)us-gaap_IncreaseDecreaseInOtherOperatingAssets | (193)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable | (359)us-gaap_IncreaseDecreaseInAccountsPayable | (552)us-gaap_IncreaseDecreaseInAccountsPayable | 77us-gaap_IncreaseDecreaseInAccountsPayable
Accrued volume incentives | (1,905)natr_IncreaseDecreaseInAccruedVolumeIncentives | 1,286natr_IncreaseDecreaseInAccruedVolumeIncentives | (1,279)natr_IncreaseDecreaseInAccruedVolumeIncentives
Accrued liabilities | (5,360)us-gaap_IncreaseDecreaseInAccruedLiabilities | 7,379us-gaap_IncreaseDecreaseInAccruedLiabilities | (1,289)us-gaap_IncreaseDecreaseInAccruedLiabilities
Deferred revenue | 544us-gaap_IncreaseDecreaseInDeferredRevenue | (138)us-gaap_IncreaseDecreaseInDeferredRevenue | 1,708us-gaap_IncreaseDecreaseInDeferredRevenue
Income taxes payable | 25us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | 1,071us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | (6,259)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Liability related to unrecognized tax benefits | (5,804)natr_IncreaseDecreaseInLiabilityRelatedToUnrecognizedTaxPositions | 1,831natr_IncreaseDecreaseInLiabilityRelatedToUnrecognizedTaxPositions | 145natr_IncreaseDecreaseInLiabilityRelatedToUnrecognizedTaxPositions
Deferred compensation payable | (67)us-gaap_IncreaseDecreaseInDeferredCompensation | (305)us-gaap_IncreaseDecreaseInDeferredCompensation | (153)us-gaap_IncreaseDecreaseInDeferredCompensation
Net cash provided by operating activities | 14,182us-gaap_NetCashProvidedByUsedInOperatingActivities | 29,378us-gaap_NetCashProvidedByUsedInOperatingActivities | 26,651us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of property, plant and equipment | (26,285)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (8,570)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (6,629)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of property, plant and equipment | 85us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 248us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 25us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Purchase of investments available for sale | (721)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (442)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (174)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Proceeds from sale/maturities of investments available for sale | 247us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 200us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 3,789us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Net cash used in investing activities | (26,674)us-gaap_NetCashProvidedByUsedInInvestingActivities | (8,564)us-gaap_NetCashProvidedByUsedInInvestingActivities | (2,989)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Payments of cash dividends | (35,228)us-gaap_PaymentsOfDividends | (30,419)us-gaap_PaymentsOfDividends | (2,349)us-gaap_PaymentsOfDividends
Borrowings on long-term debt and revolving credit facility |  | 10,000us-gaap_ProceedsFromIssuanceOfLongTermDebt |
Principal payments of long-term debt and revolving credit facility | (12,267)us-gaap_RepaymentsOfLongTermDebt | (3,353)us-gaap_RepaymentsOfLongTermDebt | (3,570)us-gaap_RepaymentsOfLongTermDebt
Net proceeds from the issuance of shares to noncontrolling interests | 4,000us-gaap_ProceedsFromIssuanceOfCommonStock |  |
Investment by noncontrolling interests | 772us-gaap_ProceedsFromMinorityShareholders | 4,334us-gaap_ProceedsFromMinorityShareholders | 2,408us-gaap_ProceedsFromMinorityShareholders
Proceeds from exercise of stock options | 307us-gaap_ProceedsFromStockOptionsExercised | 653us-gaap_ProceedsFromStockOptionsExercised | 378us-gaap_ProceedsFromStockOptionsExercised
Tax benefit from stock option exercise | 44,795us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |  |
Repurchase of common stock | (7,455)us-gaap_PaymentsForRepurchaseOfCommonStock | (2,546)us-gaap_PaymentsForRepurchaseOfCommonStock |
Net cash used in financing activities | (5,076)us-gaap_NetCashProvidedByUsedInFinancingActivities | (21,331)us-gaap_NetCashProvidedByUsedInFinancingActivities | (3,133)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rates on cash and cash equivalents | (980)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | (1,477)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | (257)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents | (18,548)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (1,994)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 20,272us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of the year | 77,247us-gaap_CashAndCashEquivalentsAtCarryingValue | 79,241us-gaap_CashAndCashEquivalentsAtCarryingValue | 58,969us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of the year | 58,699us-gaap_CashAndCashEquivalentsAtCarryingValue | 77,247us-gaap_CashAndCashEquivalentsAtCarryingValue | 79,241us-gaap_CashAndCashEquivalentsAtCarryingValue
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: |  |  |
Cash paid for income taxes | 6,450us-gaap_IncomeTaxesPaid | 10,278us-gaap_IncomeTaxesPaid | 12,960us-gaap_IncomeTaxesPaid
Cash paid for interest | 171us-gaap_InterestPaid | 128us-gaap_InterestPaid | 128us-gaap_InterestPaid
Supplemental disclosure of noncash investing and financing activities: |  |  |
Purchases of property, plant and equipment included in accounts payable and accrued liabilities | $ 780us-gaap_CapitalExpendituresIncurredButNotYetPaid | $ 155us-gaap_CapitalExpendituresIncurredButNotYetPaid | $ 169us-gaap_CapitalExpendituresIncurredButNotYetPaid

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450594&loc=d3e33268-110906 + Details
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- Definition The increase (decrease) in cumulative translation adjustment before transfers included in determining net income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 + Details
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- Definition The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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