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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES -Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Rebates	$ (200,240)	$ (202,667)	$ (188,767)	$ (182,910)	$ (193,619)	$ (198,547)	$ (187,459)	$ (163,664)	$ (774,584)	$ (743,290)	$ (660,660)
Gross receivables from contracts	74,162				80,191				74,162	80,191
Contract liabilities	$ 2,685				$ 2,299				2,685	2,299
Rebate for Recycled or Returned Organic Materials
Disaggregation of Revenue [Line Items]
Rebates									$ 4,960	$ 4,428

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Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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