REVENUE (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) revenue_sub-stream	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Disaggregation of Revenue [Line Items]
Net sales	$ 166,527	$ 158,595	$ 161,554	$ 157,029	$ 163,539	$ 155,043	$ 163,687	$ 161,410	$ 643,705	$ 643,679	$ 594,790
Number of sub-streams of revenue | revenue_sub-stream									4
United States
Disaggregation of Revenue [Line Items]
Net sales									$ 475,033	482,691	460,599
Foreign Countries
Disaggregation of Revenue [Line Items]
Net sales									168,672	160,988	134,191
Product Sales Revenue
Disaggregation of Revenue [Line Items]
Net sales									639,345	639,192	590,150
Product Sales
Disaggregation of Revenue [Line Items]
Net sales									609,741	607,879	564,027
Co-manufacturing
Disaggregation of Revenue [Line Items]
Net sales									24,087	24,259	19,696
Bill and Hold
Disaggregation of Revenue [Line Items]
Net sales									3,218	4,612	4,094
Consignment
Disaggregation of Revenue [Line Items]
Net sales									2,299	2,442	2,333
Royalty Revenue
Disaggregation of Revenue [Line Items]
Net sales									$ 4,360	$ 4,487	$ 4,640