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REMEDIAL LIABILITIES (Estimates) (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) site facility | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Site Contingency [Line Items] |  |  |
Remedial Liability | $ 124,468 | $ 128,007 | $ 131,992
% of Total | 100.00% |  |
Reasonably possible additional liabilities | $ 23,053 |  |
Legal and Administrative Proceedings |  |  |
Site Contingency [Line Items] |  |  |
Remedial Liability | 17,900 |  |
Reasonably possible additional liabilities | 1,800 |  |
Facilities now used in active conduct of the Company's business (44 facilities) |  |  |
Site Contingency [Line Items] |  |  |
Remedial Liability | $ 54,193 |  |
% of Total | 43.50% |  |
Reasonably possible additional liabilities | $ 11,747 |  |
Number of facility by type | facility | 44 |  |
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 (38 facilities) |  |  |
Site Contingency [Line Items] |  |  |
Remedial Liability | $ 62,706 |  |
% of Total | 50.40% |  |
Reasonably possible additional liabilities | $ 10,549 |  |
Number of facility by type | facility | 38 |  |
Superfund sites owned by third parties (16 sites) |  |  |
Site Contingency [Line Items] |  |  |
Remedial Liability | $ 7,569 |  |
% of Total | 6.10% |  |
Reasonably possible additional liabilities | $ 757 |  |
Number of facility by type | site | 16 |  |
Superfund sites owned by third parties (16 sites) | Various |  |  |
Site Contingency [Line Items] |  |  |
Remedial Liability | $ 7,569 |  |
% of Total | 6.10% |  |
Reasonably possible additional liabilities | $ 757 |  |
Number of facility by type | site | 16 |  |
Closed incinerator and landfill | Baton Rouge LA |  |  |
Site Contingency [Line Items] |  |  |
Remedial Liability | $ 23,357 |  |
% of Total | 18.80% |  |
Reasonably possible additional liabilities | $ 3,938 |  |
Closed incinerator | Bridgeport, NJ |  |  |
Site Contingency [Line Items] |  |  |
Remedial Liability | $ 18,394 |  |
% of Total | 14.80% |  |
Reasonably possible additional liabilities | $ 2,534 |  |
Idled incinerator and legal proceedings | Mercier Quebec |  |  |
Site Contingency [Line Items] |  |  |
Remedial Liability | $ 10,414 |  |
% of Total | 8.40% |  |
Reasonably possible additional liabilities | $ 1,105 |  |
Operating solvent recycling center | Linden, NJ |  |  |
Site Contingency [Line Items] |  |  |
Remedial Liability | $ 7,678 |  |
% of Total | 6.20% |  |
Reasonably possible additional liabilities | $ 825 |  |
All other incinerators, landfills, wastewater treatment facilities and service centers (78 facilities) | Various |  |  |
Site Contingency [Line Items] |  |  |
Remedial Liability | $ 57,056 |  |
% of Total | 45.70% |  |
Reasonably possible additional liabilities | $ 13,894 |  |
Number of facility by type | facility | 78 |  |

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