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REVENUE RECOGNITION - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Rebates | $ (215,875,000) | $ (188,767,000) | $ (405,406,000) | $ (371,676,000) |
Revenue recognized fro performance obligation satisfied in previous period | 0 | 0 | 0 | 0 |
Gross receivables from contracts | 79,712,000 |  | 79,712,000 |  | $ 74,162,000
Contract liabilities | 3,133,000 |  | 3,133,000 |  | $ 2,685,000
Rebate for Recycled or Returned Organic Materials |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Rebates | $ 2,532,000 | $ 1,546,000 | $ 4,100,000 | $ 2,537,000 |

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