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OTHER ITEMS AND CHARGES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Environmental Remediation Obligations [Abstract]        
Acquisition activities $ 464 $ 138 $ 1,140 $ 138
Write-off Of deferred costs   211   211
Site Contingency [Line Items]        
Southbridge Landfill closure charge, net 917 172 1,472 1,759
Contract settlement charge 0 0 0 2,100
Project development charge 0 0 0 311
Southbridge Landfill        
Site Contingency [Line Items]        
Charlton settlement charge 0 0 0 1,216
Legal settlement 917 172 1,472 543
Southbridge Landfill closure charge, net $ 917 $ 172 $ 1,472 $ 1,759