GOODWILL AND INTANGIBLE ASSETS - Summary of Goodwill Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Changes in goodwill during the period
Balance at the beginning of the period	$ 140,764	$ 141,029
Translation effect of exchange rates	(113)	(265)
Nutra manufacturing net assets exchange	(61,542)
Total activity	(61,655)	(265)
Balance at the end of the period	79,109	140,764
Gross	574,524	636,179
Accumulated impairments	(495,415)	(495,415)
U.S. and Canada
Changes in goodwill during the period
Balance at the beginning of the period	9,251	9,251
Translation effect of exchange rates	0	0
Nutra manufacturing net assets exchange	0
Total activity	0	0
Balance at the end of the period	9,251	9,251
Gross	389,895	389,895
Accumulated impairments	(380,644)	(380,644)
International
Changes in goodwill during the period
Balance at the beginning of the period	43,443	43,708
Translation effect of exchange rates	(113)	(265)
Nutra manufacturing net assets exchange	0
Total activity	(113)	(265)
Balance at the end of the period	43,330	43,443
Gross	43,330	43,443
Accumulated impairments	0	0
Manufacturing / Wholesale
Changes in goodwill during the period
Balance at the beginning of the period	88,070	88,070
Translation effect of exchange rates	0	0
Nutra manufacturing net assets exchange	(61,542)
Total activity	(61,542)	0
Balance at the end of the period	26,528	88,070
Gross	141,299	202,841
Accumulated impairments	$ (114,771)	$ (114,771)