REVENUE (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) revenue_sub-stream	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Net sales	$ 180,713	$ 175,140	$ 173,355	$ 174,436	$ 166,527	$ 158,595	$ 161,554	$ 157,029	$ 703,644	$ 643,705	$ 643,679
Number of sub-streams of revenue | revenue_sub-stream									4
United States
Disaggregation of Revenue [Line Items]
Net sales									$ 516,347	475,033	482,691
Foreign Countries
Disaggregation of Revenue [Line Items]
Net sales									187,297	168,672	160,988
Product Sales
Disaggregation of Revenue [Line Items]
Net sales									666,193	609,741	607,879
Co-manufacturing
Disaggregation of Revenue [Line Items]
Net sales									29,063	24,087	24,259
Bill and Hold
Disaggregation of Revenue [Line Items]
Net sales									1,158	3,218	4,612
Consignment
Disaggregation of Revenue [Line Items]
Net sales									2,939	2,299	2,442
Product Sales Revenue
Disaggregation of Revenue [Line Items]
Net sales									699,353	639,345	639,192
Royalty Revenue
Disaggregation of Revenue [Line Items]
Net sales									$ 4,291	$ 4,360	$ 4,487