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
	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