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CAPITAL TRANSACTIONS (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Dec. 01, 2014 | Nov. 05, 2014 | Sep. 19, 2014 | Aug. 29, 2014 | Aug. 27, 2014 | Aug. 06, 2014 | Jun. 02, 2014 | May 07, 2014 | Apr. 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 | Aug. 31, 2013 | Nov. 30, 2014
Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend 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 |  |
Dividend paid | $ 1,871,000us-gaap_PaymentsOfDividends |  | $ 28,501,000us-gaap_PaymentsOfDividends | $ 1,619,000us-gaap_PaymentsOfDividends |  |  | $ 1,619,000us-gaap_PaymentsOfDividends |  | $ 1,618,000us-gaap_PaymentsOfDividends |  |  |  |  |  |  |  |  |  | $ 35,228,000us-gaap_PaymentsOfDividends | $ 30,419,000us-gaap_PaymentsOfDividends | $ 2,349,000us-gaap_PaymentsOfDividends |  |
Special one-time cash dividend per common share (in dollars per share) |  |  |  |  | $ 1.50natr_SpecialOneTimeCommonStockDividendsPerShareDeclared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 319us-gaap_StockRepurchasedDuringPeriodShares | 177us-gaap_StockRepurchasedDuringPeriodShares |  |  |  |  |  |  | 496us-gaap_StockRepurchasedDuringPeriodShares |  |  |  |
Average Price Paid per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 14.80us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 15.49us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |  |  |  |  | $ 15.03us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |  |
Program Balance Used for Repurchases |  |  |  |  |  |  |  |  |  |  | 4,724,000us-gaap_StockRepurchasedDuringPeriodValue | 2,731,000us-gaap_StockRepurchasedDuringPeriodValue |  |  |  |  |  |  | 7,455,000us-gaap_StockRepurchasedDuringPeriodValue | 2,546,000us-gaap_StockRepurchasedDuringPeriodValue |  |  |
2013 Share Repurchase Program 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount / us-gaap_ShareRepurchaseProgramAxis = natr_ShareRepurchaseProgram2013Member |
2014 Share Repurchase Program 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount / us-gaap_ShareRepurchaseProgramAxis = natr_ShareRepurchaseProgram2014Member
Remaining balance available for repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount / us-gaap_ShareRepurchaseProgramAxis = natr_ShareRepurchaseProgram2014Member |  |  |  |

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