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OTHER ITEMS AND CHARGES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Environmental Remediation Obligations [Abstract]        
Write off of deferred costs $ 0   $ 211  
Acquisition activities 581   719  
Contract settlement charge 0 $ 0 2,100 $ 0
Site Contingency [Line Items]        
Asset impairment charge 0 0 0 47,999
Project development charge 0 0 311 0
Environmental remediation charge 0 0 0 6,379
Charlton settlement charge 0 0 1,216 0
Legal settlement 502 754 1,044 1,341
Recovery on insurance settlement (10,000) 0 (10,000) 0
Landfill Closure (Settlement) Charge, Net (9,498) 754 (7,740) 64,868
Southbridge Landfill        
Site Contingency [Line Items]        
Project development charge $ 0 $ 0 $ 0 $ 9,149