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SUMMARY OF QUARTERLY OPERATIONS - UNAUDITED (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended
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Nov. 05, 2014 | Aug. 06, 2014 | May 07, 2014 | Mar. 17, 2014 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
SUMMARY OF QUARTERLY OPERATIONS - UNAUDITED |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales revenue |  |  |  |  | $ 86,663us-gaap_SalesRevenueNet | $ 93,406us-gaap_SalesRevenueNet | $ 92,831us-gaap_SalesRevenueNet | $ 93,467us-gaap_SalesRevenueNet | $ 93,264us-gaap_SalesRevenueNet | $ 90,405us-gaap_SalesRevenueNet | $ 91,782us-gaap_SalesRevenueNet | $ 94,375us-gaap_SalesRevenueNet | $ 366,367us-gaap_SalesRevenueNet | $ 369,826us-gaap_SalesRevenueNet | $ 360,826us-gaap_SalesRevenueNet
Cost of sales |  |  |  |  | (23,468)us-gaap_CostOfGoodsAndServicesSold | (22,742)us-gaap_CostOfGoodsAndServicesSold | (22,793)us-gaap_CostOfGoodsAndServicesSold | (22,581)us-gaap_CostOfGoodsAndServicesSold | (23,611)us-gaap_CostOfGoodsAndServicesSold | (22,917)us-gaap_CostOfGoodsAndServicesSold | (22,075)us-gaap_CostOfGoodsAndServicesSold | (23,741)us-gaap_CostOfGoodsAndServicesSold | (91,584)us-gaap_CostOfGoodsAndServicesSold | (92,344)us-gaap_CostOfGoodsAndServicesSold | (91,369)us-gaap_CostOfGoodsAndServicesSold
Gross profit |  |  |  |  | 63,195us-gaap_GrossProfit | 70,664us-gaap_GrossProfit | 70,038us-gaap_GrossProfit | 70,886us-gaap_GrossProfit | 69,653us-gaap_GrossProfit | 67,488us-gaap_GrossProfit | 69,707us-gaap_GrossProfit | 70,634us-gaap_GrossProfit | 274,783us-gaap_GrossProfit | 277,482us-gaap_GrossProfit | 269,457us-gaap_GrossProfit
Volume incentives |  |  |  |  | 31,727natr_VolumeIncentives | 34,918natr_VolumeIncentives | 34,270natr_VolumeIncentives | 34,893natr_VolumeIncentives | 34,293natr_VolumeIncentives | 33,203natr_VolumeIncentives | 33,838natr_VolumeIncentives | 34,182natr_VolumeIncentives | 135,808natr_VolumeIncentives | 135,516natr_VolumeIncentives | 130,875natr_VolumeIncentives
Selling, general and administrative |  |  |  |  | 30,634us-gaap_SellingGeneralAndAdministrativeExpense | 30,200us-gaap_SellingGeneralAndAdministrativeExpense | 29,941us-gaap_SellingGeneralAndAdministrativeExpense | 29,152us-gaap_SellingGeneralAndAdministrativeExpense | 33,020us-gaap_SellingGeneralAndAdministrativeExpense | 27,773us-gaap_SellingGeneralAndAdministrativeExpense | 28,068us-gaap_SellingGeneralAndAdministrativeExpense | 29,522us-gaap_SellingGeneralAndAdministrativeExpense | 119,927us-gaap_SellingGeneralAndAdministrativeExpense | 118,383us-gaap_SellingGeneralAndAdministrativeExpense | 104,716us-gaap_SellingGeneralAndAdministrativeExpense
Operating income |  |  |  |  | 834us-gaap_OperatingIncomeLoss | 5,546us-gaap_OperatingIncomeLoss | 5,827us-gaap_OperatingIncomeLoss | 6,841us-gaap_OperatingIncomeLoss | 2,340us-gaap_OperatingIncomeLoss | 6,512us-gaap_OperatingIncomeLoss | 7,801us-gaap_OperatingIncomeLoss | 6,930us-gaap_OperatingIncomeLoss | 19,048us-gaap_OperatingIncomeLoss | 23,583us-gaap_OperatingIncomeLoss | 33,866us-gaap_OperatingIncomeLoss
Other income (expense) |  |  |  |  | 349us-gaap_OtherNonoperatingIncomeExpense | (42)us-gaap_OtherNonoperatingIncomeExpense | (79)us-gaap_OtherNonoperatingIncomeExpense | (262)us-gaap_OtherNonoperatingIncomeExpense | 249us-gaap_OtherNonoperatingIncomeExpense | (216)us-gaap_OtherNonoperatingIncomeExpense | 1,522us-gaap_OtherNonoperatingIncomeExpense | 438us-gaap_OtherNonoperatingIncomeExpense | (34)us-gaap_OtherNonoperatingIncomeExpense | 1,993us-gaap_OtherNonoperatingIncomeExpense | 1,573us-gaap_OtherNonoperatingIncomeExpense
Income from continuing operations before provision for income taxes |  |  |  |  | 1,183us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 5,504us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 5,748us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 6,579us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,589us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 6,296us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 9,323us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 7,368us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 19,014us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 25,576us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 35,439us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision (benefit) for income taxes |  |  |  |  | 309us-gaap_IncomeTaxExpenseBenefit | 407us-gaap_IncomeTaxExpenseBenefit | 2,198us-gaap_IncomeTaxExpenseBenefit | (3,657)us-gaap_IncomeTaxExpenseBenefit | 776us-gaap_IncomeTaxExpenseBenefit | 1,610us-gaap_IncomeTaxExpenseBenefit | 3,235us-gaap_IncomeTaxExpenseBenefit | 2,302us-gaap_IncomeTaxExpenseBenefit | (743)us-gaap_IncomeTaxExpenseBenefit | 7,923us-gaap_IncomeTaxExpenseBenefit | 10,531us-gaap_IncomeTaxExpenseBenefit
Net income from continuing operations |  |  |  |  | 874us-gaap_IncomeLossFromContinuingOperations | 5,097us-gaap_IncomeLossFromContinuingOperations | 3,550us-gaap_IncomeLossFromContinuingOperations | 10,236us-gaap_IncomeLossFromContinuingOperations | 1,813us-gaap_IncomeLossFromContinuingOperations | 4,686us-gaap_IncomeLossFromContinuingOperations | 6,088us-gaap_IncomeLossFromContinuingOperations | 5,066us-gaap_IncomeLossFromContinuingOperations | 19,757us-gaap_IncomeLossFromContinuingOperations | 17,653us-gaap_IncomeLossFromContinuingOperations | 24,908us-gaap_IncomeLossFromContinuingOperations
Loss from discontinued operations |  |  |  |  | (4,964)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (4,106)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (316)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (571)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 30us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 164us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (36)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (202)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (9,957)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (44)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 472us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income |  |  |  |  | (4,090)us-gaap_ProfitLoss | 991us-gaap_ProfitLoss | 3,234us-gaap_ProfitLoss | 9,665us-gaap_ProfitLoss | 1,843us-gaap_ProfitLoss | 4,850us-gaap_ProfitLoss | 6,052us-gaap_ProfitLoss | 4,864us-gaap_ProfitLoss | 9,800us-gaap_ProfitLoss | 17,609us-gaap_ProfitLoss | 25,380us-gaap_ProfitLoss
Net loss attributable to noncontrolling interests |  |  |  |  | (193)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (26)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |  |  |  |  |  | (219)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |
Net income attributable to common shareholders |  |  |  |  | $ (3,897)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 1,017us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 3,234us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 9,665us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 1,843us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 4,850us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 6,052us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 4,864us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 10,019us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 17,609us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 25,380us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations (in dollars per share) |  |  |  |  | $ 0.05us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.30us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.22us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.63us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.11us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.29us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.38us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.32us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.15us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.10us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.59us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Income (loss) from discontinued operations (in dollars per share) |  |  |  |  | $ (0.26)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | $ (0.24)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | $ (0.02)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | $ (0.03)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare |  | $ 0.01us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare |  | $ (0.01)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | $ (0.57)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare |  | $ 0.03us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare
Net Income (loss) per common share attributable to shareholders (in dollars per share) |  |  |  |  | $ (0.21)us-gaap_EarningsPerShareBasic | $ 0.06us-gaap_EarningsPerShareBasic | $ 0.20us-gaap_EarningsPerShareBasic | $ 0.60us-gaap_EarningsPerShareBasic | $ 0.11us-gaap_EarningsPerShareBasic | $ 0.30us-gaap_EarningsPerShareBasic | $ 0.38us-gaap_EarningsPerShareBasic | $ 0.31us-gaap_EarningsPerShareBasic | $ 0.58us-gaap_EarningsPerShareBasic | $ 1.10us-gaap_EarningsPerShareBasic | $ 1.62us-gaap_EarningsPerShareBasic
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations (in dollars per share) |  |  |  |  | $ 0.05us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.29us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.22us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.61us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.11us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.28us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.38us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.31us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.12us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.08us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.56us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Income (loss) from discontinued operations (in dollars per share) |  |  |  |  | $ (0.25)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ (0.23)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ (0.02)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ (0.03)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare |  | $ 0.01us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare |  | $ (0.01)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ (0.56)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ (0.01)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ 0.03us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare
Net Income (loss) per common share attributable to shareholders (in dollars per share) |  |  |  |  | $ (0.20)us-gaap_EarningsPerShareDiluted | $ 0.06us-gaap_EarningsPerShareDiluted | $ 0.20us-gaap_EarningsPerShareDiluted | $ 0.58us-gaap_EarningsPerShareDiluted | $ 0.11us-gaap_EarningsPerShareDiluted | $ 0.29us-gaap_EarningsPerShareDiluted | $ 0.38us-gaap_EarningsPerShareDiluted | $ 0.30us-gaap_EarningsPerShareDiluted | $ 0.56us-gaap_EarningsPerShareDiluted | $ 1.07us-gaap_EarningsPerShareDiluted | $ 1.59us-gaap_EarningsPerShareDiluted
Dividends declared per common share (in dollars per share) | $ 0.10us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10us-gaap_CommonStockDividendsPerShareDeclared | $ 1.60us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10us-gaap_CommonStockDividendsPerShareDeclared | $ 1.60us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10us-gaap_CommonStockDividendsPerShareDeclared | $ 1.90us-gaap_CommonStockDividendsPerShareDeclared | $ 1.90us-gaap_CommonStockDividendsPerShareDeclared | $ 0.15us-gaap_CommonStockDividendsPerShareDeclared

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- Definition The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 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 210.5-03.21) -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 04 -Paragraph 18 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 + Details
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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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