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CLOSURE AND POST-CLOSURE LIABILITIES (Tables)
 9 Months Ended
Sep. 30, 2023
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Closure and Post-Closure Liabilities
The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) from January 1, 2023 through September 30, 2023 were as follows (in thousands):
Landfill
Retirement
Liability		Non-Landfill
Retirement
Liability		Total
Balance at January 1, 2023$62,251 $56,550 $118,801 
Liabilities assumed in acquisitions— 574 574 
Measurement period adjustments from prior period acquisitions— 3,015 3,015 
New asset retirement obligations2,221 — 2,221 
Accretion3,765 3,351 7,116 
Changes in estimates recorded to consolidated statement of operations— 47 47 
Changes in estimates recorded to consolidated balance sheet(327)1,461 1,134 
Expenditures(7,205)(5,852)(13,057)
Currency translation and other20 20 40 
Balance at September 30, 2023$60,725 $59,166 $119,891