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NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Incentive Trip Accrual |  |  |  |  |  |  |  |  |  |  |
Convention and meeting costs | $ 4,624 |  |  |  | $ 5,047 |  |  |  | $ 4,624 | $ 5,047 |
Foreign Currency Translation |  |  |  |  |  |  |  |  |  |  |
Minimum cumulative inflation rate for considering a country to have a highly inflationary economy (as a percent) |  |  |  |  |  |  |  |  | 100.00% |  |
Period of cumulative inflation rate for considering a country to have a highly inflationary economy |  |  |  |  |  |  |  |  | 3 years |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |
Period for amortizaton membership fees |  |  |  |  |  |  |  |  | 1 year |  |
Period for sales return from date of purchase |  |  |  |  |  |  |  |  | 90 days |  |
Sales return |  |  |  |  |  |  |  |  | 2,249 | 606 | 605
Shipping and handling revenues |  |  |  |  |  |  |  |  | 11,264 | 11,615 | 12,165
Advertising Costs |  |  |  |  |  |  |  |  |  |  |
Advertising costs |  |  |  |  |  |  |  |  | 1,418 | 1,191 | 1,318
Research and Development |  |  |  |  |  |  |  |  |  |  |
Research and development expenses |  |  |  |  |  |  |  |  | 1,464 | 1,552 | 2,020
Net income (loss) available to common stockholders |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations |  |  |  |  |  |  |  |  | 25,380 | 17,601 | 8,469
Loss from discontinued operations |  |  |  |  |  |  |  |  |  |  | (9,702)
Net income (loss) | $ 4,496 | $ 6,370 | $ 7,286 | $ 7,228 | $ 7,621 | $ (2,256) | $ 5,614 | $ 6,622 | $ 25,380 | $ 17,601 | $ (1,233)
Basic weighted-average shares outstanding |  |  |  |  |  |  |  |  |  |  |
Basic weighted-average shares outstanding |  |  |  |  |  |  |  |  | 15,648 | 15,550 | 15,515
Basic net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.62 | $ 1.13 | $ 0.55
Loss from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ (0.63)
Net income (loss) (in dollars per share) | $ 0.28 | $ 0.41 | $ 0.47 | $ 0.46 | $ 0.49 | $ (0.14) | $ 0.36 | $ 0.43 | $ 1.62 | $ 1.13 | $ (0.08)
Diluted Shares Outstanding |  |  |  |  |  |  |  |  |  |  |
Basic weighted-average shares outstanding |  |  |  |  |  |  |  |  | 15,648 | 15,550 | 15,515
Stock options (in shares) |  |  |  |  |  |  |  |  | 339 | 145 | 90
Diluted weighted-average shares outstanding |  |  |  |  |  |  |  |  | 15,987 | 15,695 | 15,605
Diluted net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.59 | $ 1.12 | $ 0.54
Loss from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ (0.62)
Net income (loss) (in dollars per share) | $ 0.28 | $ 0.40 | $ 0.46 | $ 0.46 | $ 0.48 | $ (0.14) | $ 0.36 | $ 0.43 | $ 1.59 | $ 1.12 | $ (0.08)
Potentially dilutive shares excluded from diluted-per-share amounts: |  |  |  |  |  |  |  |  |  |  |
Stock options (in shares) |  |  |  |  |  |  |  |  | 88 | 219 | 50
Potentially anti-dilutive shares excluded from diluted-per-share amounts: |  |  |  |  |  |  |  |  |  |  |
Stock options (in shares) |  |  |  |  |  |  |  |  | 254 | 200 | 419

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