REVENUE RECOGNITION - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Rebates	$ (241,969,000)	$ (202,667,000)	$ (647,375,000)	$ (574,344,000)
Revenue recognized fro performance obligation satisfied in previous period	0	0	0	0
Gross receivables from contracts	91,469,000		91,469,000		$ 74,162,000
Contract liabilities	3,422,000		3,422,000		$ 2,685,000
Rebate for Recycled or Returned Organic Materials
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Rebates	$ 4,341,000	$ 1,018,000	$ 8,440,000	$ 3,555,000