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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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