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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES -Revenue Recognition (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Rebates | $ (889,211) | $ (774,584) | $ (743,290)
Gross receivables from contracts | 89,232 | 74,162 |
Contract liabilities | 3,404 | 2,685 |
Rebate for Recycled or Returned Organic Materials |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Rebates | $ 13,071 | $ 4,960 |

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