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REMEDIAL LIABILITIES (Estimates) (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) facility | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Site Contingency [Line Items] |  |  |
Accrual for Environmental Loss Contingencies | $ 114,813 | $ 114,173 | $ 121,017
% of Total | 100.00% |  |
Reasonably possible additional liabilities | $ 22,241 |  |
Legal and Administrative Proceedings |  |  |
Site Contingency [Line Items] |  |  |
Accrual for Environmental Loss Contingencies | 24,000 | $ 18,400 |
Facilities now used in active conduct of the Company's business (37 facilities) |  |  |
Site Contingency [Line Items] |  |  |
Accrual for Environmental Loss Contingencies | $ 42,151 |  |
% of Total | 36.70% |  |
Reasonably possible additional liabilities | $ 10,565 |  |
Number of facility by type | facility | 37 |  |
Inactive facilities not now used in active conduct of the Company's business but most of which were acquired because the assumption of remedial liabilities for such facilities was part of the purchase price for the CSD assets (27 facilities) |  |  |
Site Contingency [Line Items] |  |  |
Accrual for Environmental Loss Contingencies | $ 63,060 |  |
% of Total | 54.90% |  |
Reasonably possible additional liabilities | $ 10,716 |  |
Number of facility by type | facility | 27 |  |
Superfund sites (16 sites) |  |  |
Site Contingency [Line Items] |  |  |
Accrual for Environmental Loss Contingencies | $ 9,602 |  |
% of Total | 8.40% |  |
Reasonably possible additional liabilities | $ 960 |  |
Number of facility by type | facility | 16 |  |
Superfund sites (16 sites) | Various |  |  |
Site Contingency [Line Items] |  |  |
Accrual for Environmental Loss Contingencies | $ 9,602 |  |
% of Total | 8.40% |  |
Reasonably possible additional liabilities | $ 960 |  |
Closed incinerator and landfill | Baton Rouge LA |  |  |
Site Contingency [Line Items] |  |  |
Accrual for Environmental Loss Contingencies | $ 25,650 |  |
% of Total | 22.30% |  |
Reasonably possible additional liabilities | $ 4,208 |  |
Closed incinerator | Bridgeport, NJ |  |  |
Site Contingency [Line Items] |  |  |
Accrual for Environmental Loss Contingencies | $ 17,832 |  |
% of Total | 15.50% |  |
Reasonably possible additional liabilities | $ 2,510 |  |
Idled incinerator and legal proceedings | Mercier, Quebec |  |  |
Site Contingency [Line Items] |  |  |
Accrual for Environmental Loss Contingencies | $ 11,158 |  |
% of Total | 9.70% |  |
Reasonably possible additional liabilities | $ 1,157 |  |
Operating solvent recycling center | Linden, NJ |  |  |
Site Contingency [Line Items] |  |  |
Accrual for Environmental Loss Contingencies | $ 7,220 |  |
% of Total | 6.30% |  |
Reasonably possible additional liabilities | $ 758 |  |
All other incinerators, landfills, wastewater treatment facilities and service centers (60 facilities) |  |  |
Site Contingency [Line Items] |  |  |
Number of facility by type | facility | 60 |  |
All other incinerators, landfills, wastewater treatment facilities and service centers (60 facilities) | Various |  |  |
Site Contingency [Line Items] |  |  |
Accrual for Environmental Loss Contingencies | $ 43,351 |  |
% of Total | 37.80% |  |
Reasonably possible additional liabilities | $ 12,648 |  |

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