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OTHER ITEMS AND CHARGES (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Site Contingency [Line Items] |  |  |  |
Expense from acquisition activities | $ 173 | $ 1,097 | $ 1,533 | $ 2,237
Southbridge Landfill closure charge | 2,642 | 625 | $ 3,815 | 2,097
Multiemployer pension plan, type |  |  | us-gaap:PensionPlansDefinedBenefitMember |
Multiemployer pension plan, name |  |  | us-gaap:RetirementPlanNameOtherMember |
Multiemployer pension plan, collective-bargaining arrangement |  |  | us-gaap:CollectiveBargainingArrangementOtherMember |
Multiemployer pension plan withdrawal obligation |  | 3,194 |  | 3,194
Withdrawal costs - multiemployer pension plan | 0 | 3,591 | $ 0 | 3,591
Reversal of pension costs |  | 397 |  | 397
Contingent liability term |  |  | 17 years |
Withdrawal obligation, gross payments | 4,224 |  | $ 4,224 |
Estimated accumulated benefit obligation as complete withdrawal | 18,511 |  | 18,511 |
Southbridge Landfill |  |  |  |
Site Contingency [Line Items] |  |  |  |
Southbridge Landfill closure charge | 2,642 | $ 625 | 3,815 | $ 2,097
Legal and other costs | 642 |  | 1,851 |
Loss contingency, settlement awarded | $ 2,000 |  | 2,000 |
Amortization |  |  | 152 |
Recovery credited to environmental remediation expense |  |  | $ (188) |

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- Definition The aggregate (recovery) charge recognized in the period associated with the unplanned closure of the Southbridge Landfill. (Recovery) charges are expected to be incurred through completion of the closure process + References No definition available. + Details
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